Holley sniper stumbles on acceleration

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holley sniper stumbles on acceleration 3 Basic Causes of Stumble As with engines before the days of Electronic Fuel Injection (EFI), stumble had two basic causes- incorrect ignition and incorrect fuel/ air mixture for the required operating condition. Holley went back to the drawing board and built the ultimate air valve for your LS engine. (4 barrel single pump holley 650) Feb 28, 2018 · My 440 idles rough and the RPM advance stumbles in the first 1000 RPM but is goo thereafter. 60 Alum heads, Weiand Stealth, Holley C950 TBI, BBK Long tubes 12-21-2010, 03:28 PM #12 ngl9766 acceleration tests, if you notice that the car first hesitates and then picks up, it’s a sure bet that the pump nozzle size should be increased. 5" exhaust. 2) Clean out the nozzle tip. Sep 04, 2019 · Pressure was 6. I am not real sure how the sniper numbers equate to the MSD Atomic (which is owned by Holley) but here is the way my numbers are. I've read that the carb spacer fixes this issue most of the time. To start with, turn the key to the on position and then find Go EFI Tuning on the main menu and press enter. Holley's is Ford Gran Torino - Holley Sniper EFI - Engine Stumble - Diagnoses. Holley LS throttle bodies are unquestionably the biggest bore and most feature-loaded option available. Jun 13, 2019 · The problem is the engine will start and idle, but won’t run anything past a fast idle before it stumbles and dies. I put a motorcraft 2150 from the ebay guy and its not dependable. 0 Last edited on February 16, 2019, 9:35 am by henry. Jan 27, 2015 · Ive posted this issue over at Holley as well and Danny Cabral is giving some advice. I’ve put about 1,500 miles on the engine since I did the Sniper system and it still stumbles. Have to back off on the throttle and then gently wrap it up. I worked with it for months with Patrick's help, but never could get it quite Sniper EFI throttle body height is right inline with most any carb out there, holley or edelbrock, so if the air cleaner works with one of them, it'll work with the sniper. I can't seem to get rid of a hesitation when accelerating. Dec 12, 2017 · The engineers at FiTech have made an art of building EFI systems that are designed to upgrade carbureted daily-drivers and race vehicles. 2 block, TFS T/W 11R 205 heads, 232°-244° duration/. carb and a mild performance camshaft. It could be the wrong jets, but this is not likely if the carb was originally set up for your engine or it used to run fine. If replacing the TPS, the TPS sensor is located at the end of the primary throttle shaft, opposite end of the throttle lever. that's specific to their engine. After discussing it in this thread and talking with Holley's tech support, I decided to run the blue wire to a distribution block. 1968 Skylark Convertible 383 Stroker, Turbo 350, 3. The smooth low-end torque and acceleration is unbelievable. He did tell me to wait until I get the base figured out until I touch the acceleration enrichment. Acceleration Stumble. Dec 22, 2010 · 1985 GT, Sunroof, 5 Lug, Rear Discs, 01 Graphite Bullets, 88 forged piston shortblock, 2. com Since my first post about this issue I have added a Holley Sniper system and dual sync distributor. post more details Im new to this site and am trying to find some good info from readers on Holley carbs! The problem I am having is at idle tooooo rich! Float level is good air mix screws 1 turn out and still way rich at idle! My combo is 468 BBC 10. If the cams are not timed properly it can cause the engines valves to come into contact with the pistons causing extensive Considering buying a Holley Sniper EFI system and Holley distributor. I read somewhere on the Holley website that this is 1-2% of people but take that for what it's worth. The carb is on the bottom of the mains, and the pump-shot is all used up. You may have to register before you can post: click the register link above to proceed. My inquiry is regarding the Holley Sniper EFI system that was just installed in my '71 Chevelle Malibu. chevrolet | gmc | cadillac; ford; chrysler | dodge | jeep | ram 2005-2021 chrysler 300 | dodge charger | dodge magnum QuadraJet Idle Problem from corvetteforum. 0405 @neil-0405. This Tech Tip is From … If this is your first visit, be sure to check out the FAQ by clicking the link above. If a hacksaw must be used, then metal chips must be removed. . Hesitation or stalling, after the vehicle has been driven for a short time, indicates a defective electric assist, accelerator pump or ignition condenser. Either increase the pump size or the nozzle size or both. I had to modify the carb stud fitting, but that was due to being lazy and not going out to buy a longer stud to allow for the spring bracket. Feb 06, 2014 · The four self-learning EFI systems we chose to evaluate are the MSD Atomic, FAST EZ-EFI 2. 558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump Nothing show quality but is pretty clean with a few chips here and there but nothing obvious (got repainted when car was rebuilt). Jul 16, 2017 · Holley offers a kit (PN 20-13) that contains several color-coded springs. IE hard accelerate from say 2k rpm, it pulls to say 3500ish and starts to stumble and cough, if I hold throttle  The Sniper was installed with the new engine 383 stroker 460 HP. To do this you need an engine RPM input signal; Holley recommends and really only talks about the magnetic pickups from their Holley MSD dizzys but I think the Pertronix can provide the same signal. I have since installed a Holley Sniper tank and in The Sniper EFI calibrates the TPS sensor at every key-on event. Nov 19, 2020 · That makes for a hot-sounding lopy idle, but it can cause the engine to hesitate, stumble and stall when the throttle is cracked open. Over time, the leather plunger may become worn or will dry up. I have since installed a Holley Sniper tank and in Nov 17, 2006 · If you go too lean on the idle-feed restrictors, the engine will surge at cruise and hesitate under light acceleration, since most engines don't like to accelerate at lean air/fuel ratios. I've adjusted the basic fuel prime up to 175% and it starts quicker than ever before. 5 enough that when I punch it to show off, there is no hesitation or lag just Vroom. Jun 09, 2019 · 440 built to stock specs. This assembly delivers an initial shot of fuel in the right amount, and duration, to provide crisp throttle response right off idle. FWIW on the dyno the engine made 640 torque and 592 HP. It was pretty well-tuned from Holley, except for a lean area from 2000 to 3000 RPM under deep throttle. Rebuilding or replacing the carburetor may be necessary. Slight acceleration hesitation driving me mad Views: 4,798. Find Holley Sniper 550-516 Holley Sniper EFI Self-Tuning Fuel Injection Systems and get Free Shipping on Orders Over $99 at Summit Racing! Holley Sniper EFI self-tuning fuel injection systems deliver all the benefits—and none of the hassles. How to tell what size carb you need: You take the engine cubic inch and multiply by the maximum RPM and divide by 3456. I broke in the cam on the new engine (SBC 400) with the sniper and dual sync, also with really no issues. Not only does the Sniper EFI BBD offer superior throttle response and WOT power over the carburetor, but you can also gain timing control! Put an end to cold start issues, hesitations, vapor lock, and flooding That's exactly why sniper Rafi allows anyone using their built in timing control feature to build a custom timing table. One of the first symptoms of a possible issue with the fuel pressure regulator is engine performance issues. Part Numbers: Component: PN: Idle-Eze throttle plate assm. Adding a correctly tuned amount of acceleration enrichment to an incorrectly tuned fuel table is still going to result in an incorrect amount of fuel. https://www. Engine hesitates or “bogs” during initial acceleration (after engine is at operating temperature). 0, Edelbrock E-Street, and Holley Terminator EFI. Went a little to far down (barely above the bottom) and the hesitation was worse so I went to raise the float level but accidentally turned the nut clockwise. 300 I6. In conclusion Injection Kits-Carb installation parts-Sniper replacement parts. Based on the fuel pounds/hour readout on the handheld, we are getting 25 mpg at 65mph. When I went to start the car gas literally shot out of the primary vent tube. Pump shooters are another area of experimentation. If this occurs, bypass the filter. If the engine "pops" or hesitates upon acceleration from a standing stop, it can be caused by an air leak. If I were in your situation, I'd play with the acceleration enrichment until the stumble went away, and not rely on the self learning to figure out To be sent to tech support Oct 13, 2009 · Holleys are VERY sensitive to dirt. Was running a conventional Holley double pumper and had the carb pretty well dialed in but I always had a very slight hesitation to wide open throttle transition and was always tweaking the carb as the weather changed. 55 final drive, 5 speed ZF5. No bogs, no hesitation, just lean for a second. With an otherwise mechanically sound engine, you should not be able to make a stumble at 1/4 throttle. com/-50-Pc-M0-011-060-Steel-Plug-P Q: I can’t get the “Bog” out of my mechanical secondary carburetor what’s wrong and how can I fix it? The sole purpose of the accelerator pump system is to provide a combustible air/fuel ratio during hard acceleration, especially from idle, for the time it takes the main metering system, via the booster venturi, to respond to the increase in air velocity. I've seen this problem so many times now, that I'm sure there are a lot of cars out there suffering this problem. Do not move the secondary float bowl to the primary and vice versa. 73 Posi FiTech GoEFI4 600 RobbMC PowerSurge 500 In this video I show you exactly what RFI or EMI looks like on a data log. , 650/750-cfm, vac. WOT is F-U-N when the engine makes a lot of power, and there is usually some degree of glory associated with making a lot of power. How To Tune Holley Carburetors. I have been spending time adjusting thing and this Sniper is wonderful. 09 Nissan Titan tow vehicle Holley Sniper EFI 2GC Large Bore Fuel Injection Systems. Took some time but I finally bought the cam kit for the accelerator pump. Acceleration Enrichment . Ive been running a Holley Sniper for a about four years now. 0 and the FAST Sportsman XFI after repeatedly having to replace failed parts. Bob and Alan Beck’s #4 sprint car ran at Stockton 99 with a conservative high-end AFR of 4. Mar 29, 2004 · We're working on a 350 SBC, we just finished putting a Holley street dominator manifold, lunati cam, and Holley 4160 750 CFM carb. If you have a car that accelerates well, Holley offers vent whistles and jet extensions that solve the problems that occur during heavy acceleration and braking. Jun 17, 2018 · Atomization Abounds. 5" exhaust out. The car has a very mild 351C 2V with and Edlebrock Performer, and a 700 Holley double pumper carb. 00 off as a credit towards the repair. I personally would take a Holley Sniper before I would take a FITech. toggle right slidebar. Mar 28, 2018 · I was wondering if anyone here has seen the new Holley Sniper 2300 EFI 2bbl or that Fitech has also just released a new 2bbl version and both of these systems are very user friendly and both will run on a 4 cylinder enginethey both have only 4 wire connection to function. If you have an automatic transmission you will need a vacuum sec. 0L 4V) Commonly referred to as the engine computer, or ‘brain’, this PCM is calibrated for operation with a stock BR33-9600-BC air cleaner assembly (included with this kit) and ‘Return Style’ fuel system as shown on page 14. 1 WOT. It's slotted, so install it in the same position. 5 to 1 power mixture; a high performance engine with improved combustion chamber design such as a Pro-Stock or a Winston Cup engine, which are being used in some of the top offshore race boats, can Holley’s first 4-barrel carburetor was the 2140 in 1953 on Lincolns, then the infamous 4000 “Teapot” in 1955. Seems like this would solve a lot of problems with EFI conversions such as external pump, risk of running dry or air in the pump during hard corners, requirement for additional surge tank, etc. As I stated above, the problem lies in a firmware setting that cancels out very slow TPS based acceleration enrichment but it's set too high for some vehicles. The Sniper is the ticket for the smoothest, cleanest desmog. You can see this in the datalog at 500,550  Acceleration Enrichment can't be tuned until the Base Fuel Table is well tuned. The best power with a carburetor was 503 hp at 5,800 rpm and 499 lb-ft of torque at 4,400 rpm. The classic off-idle  Congratulations on your purchase of a new Sniper EFI Throttle Body System built Holley Performance Products has written this manual for the installation of the driving conditions, you can perform some harder acceleration runs including  How-to adjust the accelerator pump on Holley carburetors to avoid stumbling and hesitation upon acceleration. Check for sufficient fuel pressure. I have replaced spark plugs, wires, cap and rotor. Comp Cam 32-225-4. It's actually even a bit cheaper. I have also replaced the crankshaft sensor and the coil pack. Oct 22, 2015 · Happens around 6-8% throttle on the datalogs. Holley carburetors had the traditional square-bore (equal-size) throttle plates, primary and secondary. Revs to 6000 smoothly and strong. It gives you 6-8 different cams to adjust how quick the acc. I hoped for - smooth idle, no stumbling on acceleration, and all around responsiveness. IE hard accelerate from say 2k rpm, it pulls to say 3500ish and starts to stumble and cough, if I hold throttle position and let it stumble through, it clears and runs smoother as load goes away and rpm increases. Neil. The next firmware update will have a user programmable setting to Jun 29, 2017 · The other issue was a stumble on initial acceleration. I was thinking about fuel injecting it. Quarter or part throttle acceleration is fine and acceleration once the engine is up to 3000 rpm’s and over is fine; no stumbles. com/products/fuel_systems/fuel_injection/sniper_efi/sniper_4bbl_tbi_kits/sniper_4bbl_tbi_master_kits_with_fuel_system/ Notice this throttl Apr 03, 2011 · Im running a holley 4150 carb. Posted on 28. Brodix BB2 heads and 4500 intake with an adapter for a 4150 carb MSD dizzy and 6AL box! Stumble, hesitation, and flat spots are caused when the accelerator doesn't provide enough of a fuel shot as the throttle is opened. If you have a momentary lean spike, on light throttle acceleration, check. 5 Cruise, and 13. All of these systems use a dedicated, standard 4150 Holley 550-511K Sniper EFI Self-Tuning Master Kit This will be fitted on my 68 fastback with the 351c, Full MSD ignition, long tube headers, edelbrock torker 351 (2760). Buy Holley 550-511K Sniper EFI Self-Tuning Master Kit: Fuel Injector Kits for - smooth idle, no stumbling on acceleration, and all around responsiveness. If your car stumbles or hesitates A United Nations interpreter stumbles onto a plot to assassinate a controversial African head of state on the floor of the General Assembly: Interview with the Assassin: 2002 Faux documentary; a critically ill ex-Marine sniper admits to his next-door neighbor that he assassinated President Kennedy: Invasion of the Body Snatchers: 1956 Classic Mini DIY: Classic Mini with a Holley Sniper EFI - Deep Dive Classic Mini DIY: Building A Supercharged Classic Mini Engine #4 Classic Mini DIY: How to install LED Headlights on a Classic Mini Classic Mini DIY: Supercharged Mini #5 - First Startup In a world-first, Speartech delivers the unbelievable: an LT5 V8 from a Corvette ZR1, plus a 10R90 10-speed automatic, swapped into a C10! Jan 08, 2016 · Misfires and a decrease in power, acceleration, and fuel efficiency. The regulator is a critical piece and should to be matched to the type of fuel delivery system and the fuel pump that you are using or plan to use. This procedure is only used on engines with large duration camshaft that have very low vacu Jan 29, 2019 · If the accelerator pump does not operate properly, the engine may not start or will stumble badly on acceleration. If you have a momentary lean spike, on light throttle acceleration,  Heavier loads cause stumbles. 1 with 10. It felt like it was flooding out at low speed, low RPM. Mar 25, 2016 · May God's grace bless you in the Lord Jesus Christ. Power mixture and acceleration: 12. So, I've been considering one of the retrofit modules. The idle surge on this particular engine can be completely gone, but reappear Adjusting this setting will help idle quality and takeoff from an idle. x again while still accelerating. 1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0. Holley offers a preset regulator that is reasonable cost (I think its 58-60 psi). Oct 18, 2017 · Therefore I installed a power valve in each carb rated at 10. The classic off-idle stumble causes the engine to hesitate, or worse, sneeze into the air cleaner. I have a 69 Camaro with a 350 V8 which has an Edelbrock 4 bbl. I need to research this some. com https://amzn. If you Mar 29, 2020 · Backfiring during acceleration can also be caused by internal carburetor problems, low compression, leaks in the fuel tank, lean engine conditions, and weak or broken valve springs. Sprint car engines run AFRs from 6 to 1 down to 3. A list of upcoming movies by Sony Pictures, Columbia pictures, and Sony Pictures Animation. Maybe one of the Holley Sniper software knowledgeable can help. I'm new to the sight but I was hopping Apr 04, 2019 · The acceleration enrichment table is the equivalent of a mechanical accelerator pump. -Jeff Aug 28, 2015 · Then acceleration-induced fuel tsunamis inside the tank push the fuel away from the pickup. After 45 it runs smooth and throttle response is better. will start and idle, but won't run anything past a fast idle before it stumbles and dies. The car would stumble as soon as the throttle was cracked open from idle. The patented HydraMat material is a woven nylon media that employs a combination of surface tension and fluid wicking techniques to create the unique ability to consistently pull fuel even when only a fraction of the mat is in contact with fuel. At night, wot, the pressure only dropped to 2ish psi. All pretty much plug and play. I found it had a bit of a stumble like this when you pressed the accelerator as you would probably expect. Just enough to keep up. It worked pretty well at idle and OK under full acceleration, but stumbled alot and sounded very ratty during part throttle cruise between 2000-3000 rpms. I swapped from a Edelbrock 750 and a Carter mechanical pump. '92 Ford Mustang GT: 385" SBF, Dart SHP 8. But once I had the AFR gauge it felt dangerously lean. - Verify Wiring - ECU must be powered and grounded directly at the battery and the battery is fully charged. Aug 13, 2019 · Holley Sniper EFI with Ram Air Fordboy71 replied to Fordboy71 's topic in Engine, Transmission, Drive Line, Etc Also, I set up the wiring the way Don instructed and should not be getting any RFI since everything in the system is matching Holley components and made to work together, but I guess if any of that was a problem, it wouldn’t have Dec 03, 2018 · Engine Misfire While Moving . OK, so I have been having the dreaded low load/ low RPM stumble upon acceleration as several on this site have  I've been through a couple cycles of updating the base fuel table based on learned information, smoothing, updating the Sniper, learning some  Sniper & Dual Sync hard acceleration fails. Pink Wire must be attached to a 12V+ switched source that has voltage during cranking and run positions of the ignition switch. That is more imperative for forced-induction engines, which process significantly more air than a comparable, naturally aspirated engine—and do it under positive manifold pressure. Sep 26, 2016 · Car stumbles on acceleration and low speed Hello there, when the camshafts on your 1998 Chrysler Sebring become misaligned it can cause some serious issues. It would trend lean above 6000 no matter what jet I put in it. CLICK LINK FOR GAUGE PINS: https://www. First, let's pinpoint exactly what's going on. This replaced my original 2210 Holley carb from 1974. Sounds like it is lean on acceleration. The Sniper needs a "clean" 12V wire that is hot in Start and Run. I have an 87 wrangler with a 4. Holley Carburetors. Holley Sniper EFI 2300 (3) Booster - Straight Series : Holley 4160 Aluminum Street Product Hesitation during acceleration. It could be a plugged jet or jets. I got the electric choke model as I didn't have all of the correct parts to keep it manual. 1 being lean. + Update your shipping location 7 S 0 P. Holley carburetors have powered every NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. 121240: Aug 02, 2017 · Holley carburetors find their way onto countless vehicles, from race cars to hot rods to delivery trucks, and for good reason: They’re the standard of performance, and without question some of the most popular and easily tunable carburetors available. 623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3 Hi there, Finally got my Chevelle out of the garage with the new engine this morning. Holley’s new Sniper EFI How to properly adjust the secondary speed screw on Holley carbs. ss · #3 A lean fuel mixture can cause an engine to have a surge or miss at idle and part throttle stumble on acceleration, leading to engine overheating and lack of power. I have a Holley 4150 double pumper. If you attempt to accelerate too hard off idle, to the point where the secondaries kick in, the car bogs and stumbles to the point where it dies unless you lift your foot off the pedal. Car runs pretty good every place other then off idle tip in. We replaced a holley 650 DP, that was nothing but trouble, with the Sniper EFI on my Dad's 347, and it was great, really screamed, started instantly without touching the On a new-build I swapped over to the EFI sniper and dual sync distributor on a 383 big block Mopar with 810 Mi break in. com! Real Street Ram Tunnel Ram for the Street Holley Sniper Xflow. This has a polished intake, and valve covers, air cleaner cover, and a consigner stated larger camshaft within it. 78 Malibu, 402, th350, holley sniper EFI, 9" 3:70. Throughout the life of the vehicle, the valve can become clogged and dirty, which causes the vehicle to run Jun 08, 2016 · In the most basic terms, electronically controlled engines must be carefully calibrated to take advantage of engine modifications that affect airflow and fuel delivery requirements. During this it smells rich. Mar 11, 2016 · I switched to Holley Sniper XFLOW and junked the EZ EFI 2. Jul 27, 2015 · If the engine stumbles and the mixture screws are more than 11 ⁄2 turns out, it is a sign that the mixture is going lean. Coronet-383 Sep 6, 2019. I HAVE CHECKED AND REDONE THE SPARKPLUG WIRING TO DISTRIBUTOR CAP ABOUT 30 TIMES NOW. Back out your idle screws 1/4 turn, that will stabilize the idle and help slow-speed metering. holley. Feb 28, 2019 · I went with Holley Sniper and Holley Hyperspark on my 511 build. If the vehicle’s The huge difference so far is the driveability while cold - no hesitation at all. 5 mistakes or Must Know Awoodson2k@gmail. Rebuilt the carb recently with upgraded 50cc (primary) accelerator pump, stock (rear) 30cc accelerator pump, . By 1/4 throttle the mixture screws have long ago maxed out, and the transfers are also at full capacity. So how well does the 2x4 Sniper on the Tunnel Ram work? "In a word - Fantastic! "Initial start, it fired up on the first hit of the key. 23 Posts. I learned a lot these last 8 months and am so glad for the wealth of knowledge and support I found here in MUD. 1. The setup wizard offers three cam choices for Stock / Mild ( 14+ In/HG vacuum ), Street / Strip ( 8-13 In/HG vacuum ), and Race ( 7 or less In/HG vacuum ) More aggressive camshaft grinds will likely require laptop tuning with the aid of the Sniper Software in general engines Sep 01, 2004 · And nobody wants to look silly when the engine stumbles, pukes, and spits at part throttle. at cruising speeds or hear pinging under hard acceleration Mar 25, 2016 · Holley’s new Sniper EFI fuel pump conversion makes a great upgrade for classic Chevelles, Corvettes, Novas, Camaros, and even trucks. » Read More Installing Strut Rods on 1963-’82 Corvettes Dec 18, 2014 · What could cause a backfire through the Throttle Body. 031 and a black spring for the vacuum secondaries. What you want to do for off idle stumbles is to swap different pump cams and with a few different  Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL. I have seen carbs fall flat on acceleration because of the jets becoming uncovered and not getting enough fuel. Commonly referred to as the IAC valve, this component controls the Dakota’s idle speed by allowing a certain amount of air to bypass the throttle plate. Holley Sniper EFI 2GC large bore fuel injection systems let you convert your classic 2GC large bolt pattern carburetor to EFI. get the Holley Sniper EFI, that is Does it do it under light acceleration as well? Timing retarded or advanced too far can give similar symptoms to what you have. 1-16. We're talking about engines that start easily and accelerate smoothly, but then, after a few minutes at a steady speed, either surge in speed or misfire, causing the car to "buck. Jan 08, 2016 · # 6 MALE INLET SNIPER PERFORMANCE 60406421 (BLUE) 60406423 (BLACK) #6 STANDARD EARL’S 991942ERL If installation requires cutting the metal fuel line, cut the fuel line with a good tube cutter. See page 9 for wiring and Tach Adapter information. Is the stock GM Powerglide transmission compatible with this set up? Hey all. I had a custom built 1100XE Dominator on my 540. Slight acceleration hesitation driving me mad Views: 5,189. $20 at most locations. See full list on efisystempro. I had a blue wire coming out of the firewall that met this need, but it was already hooked-up to the + side of the coil and the Duraspark box. Designing a fuel system that can pick up fuel at all fill levels and with a nearly 90-degree angle on the tank is a challenge. If you Jul 01, 2004 · Reading The Air/Fuel Mixture A lean fuel mixture (too little fuel for the amount of air in the cylinder) can cause an engine to have a surge or miss at idle and part throttle, stumble on Mar 02, 2005 · I don't know about 94's, but on a regular holley the power valves don't really do anything immediately off idle, that's the job of the accelerator pump. Hi Ben,try 69 primary main jet,134-39 secondary plate,65 power valve,discharge nozzle . push on the accelerator a little or a lot if feel a slight hesitation or stumble  If I accelerate hard (or try to) it will stumble, but clear up without backfiring. New to the group. T-5, 308, Holley Sniper and dual sync distributor Jan 17, 2017 · Engine dyno test of Holley’s Sniper EFI conversion. They’ve enabled going to fuel injection with the least obtrusive modifications from the car’s original configuration. I highly recommend this Carburetor. If I were to go FI on my 306 I would probably invest in the Edelbrock Proflow 4 EFI multi port injection. . It’s easy to understand why. Part 2 of our test on MSD's new Atomic EFI Conversion kit takes us to the streets of Southern California. FOREIGN VEHICLES Due to the fuel injection systems, some foreign vehicles may require a special Tach/Fuel Injection Adapter with a HyFire® ignition. It also had a stumble when accelerating when the car was already at speed. Unfortunately, the tuning ease of a Holley also creates some tuning problems. We get a backfire through the carb if you open the throttle quickly. A rich fuel mixture can cause an engine to “load up” at idle, foul the spark plugs, and also lack power or run sluggish. Just as an FYI on the surge tanks. If anyone can tell me what can cause Backfiring through the throttle body that would be nice. Too small of an accelerator pump in carb(s). to/36dO2cp Below are links to purchase the system and correct installation https://youtu. smooth idle, no stumbling on acceleration, and all around responsiveness. But life doesn't currently think that should be my financial priority. Insert a nozzle three sizes smaller than the one removed from the bore. 5 to 1 is the ideal air/fuel mixture for a “normal” engine, but many marine engine builders prefer a 11 or 11. 1 comp. I've gotten the tune pretty good, driveability is great. I use a RobbMC PowerSurge with zero issues. Holley 543-111 TPS or Standard Motor Products TH191 TPS. Fortunately, Holley has another product that can solve that: Hydramat. Only problem I really  I have the Sniper now installed and I'm having problems. A good test is to stick a wooden toothpick into one of the idle air corrector jets to see if it helps with the 3,000-rpm test. 5 Idle, 14. 5) in this case. We're not talking about a knocking engine or one that idles rough or stalls. I've been fighting through this for some time. sec. 13 Jun 2019 This is what that new Holley accelerator pump diaphragm looks like. You both look at each other and nod knowingly… We’ve all been there. I have changer accelerator pump squirters and have changed the cam out. I am set at 14. Have a Holley 650 DP, 4150 mechanical secondary on a stock 351w. On some carburetors, the accelerator pump is made of a leather plunger with an expanding spring to keep the leather in contact with the bore. For starters, here's the quick stats on my vehicle: 1981 Ford Bronco 300ci I6 Offenhauser DP 4BBL intake Holley 390 4BBL 48 jets 35 pump squirter Green cam on #2 Split exhaust manifolds from an EFI 4. the engine stumbles badly, and you’re underwhelmed with the results. 9. Hello Holley forum folks. Check for retarded ignition timing. Engine backfires when cold. Holley LS Throttle Bodies. Update. Once we followed the poster's advice, all of our stumbling during acceleration and stalls during stops ceased. One Holley carburetor was used for 1972 on the last of the LT1 small-blocks for production Corvettes. Since the acceleration enrichment is stacked on top of the fuel the ECU is commanding based on the VE table, you’ll want to tune AE last, after you’ve got the solid foundation of a well tuned VE table under you. 5psi. Aug 19, 2011 · I have some tuning questions regarding my Holley 4bbl. prolinemax. This is a great time to visually inspect the overall Sniper EFI install. Holley Sniper EFI w/Offenhauser C Intake. I explained using the Holley Sniper EFI on the Opel engine and he recommended the PA-2 pump kit. large double room close to science park. Because when coming to a stop when the car almost dies I tap the throttle to activate the accelerator pump and im back running smooth. Also on Msd the higher the number = Leaner and Lower#= Richer. 13. I think the reason it works better, is you have a return from the throttle body going to it, to keep the fuel A lean mixture in a motorcycle will symptomatically be hard to start - and you will see less/little fuel in the carburetor and if you remove the plug(s) immediatly after starting attempts, the plugs will be dry rather than an overly rich mixture where they might be "wet" with fuel. 2. With dyno testing done and the car owner having approved the retro appearance of the installed kit, it was time for some real world testing. This cleared itself up quickly. I`m assuming the . The engine stumbles, coughs, and then accelerates. It felt like it was going to stall out at stop Jan 01, 1970 · The Sniper has pre-programmed base calibrations that are a good starting point for most street drivable camshafts. The light weight springs with the Sniper was the perfect combo. I have an 89 IrocZ camaro with a 383 stroker and the easy street 600hp system. 00 rear 9" 4spd manual trans w/OD The next step is the fun part: wide-open throttle. com member lars Just thought I'd pass on a little tip to those of you running Q-Jets. I had a bad stumble on hard take off plus it would almost stop if I accelerated hard from any cruising speed. We crank it over and eventually it starts but runs through the same problem. It did not need to be adjusted from the base It's not a lack of Fuel Table resolution. Holley 550-511K Sniper EFI Self-Tuning Master Kit in Fuel Injectors. If you just use the Sniper simple timing setup say 15 initial and 35 at WOT, you get a really sharp map, your 15 degree base will hold to 2450 RPM, then it will jump instantly to 25 deg at 2500 RPM and again to 35. The concept is roughly similar in vehicle engine systems. hesitation during light throttle acceleration. A number of you wanted to know what my thoughts would be after running the Holley EFI on my Lincoln. I replaced the entire fuel system from the tank forward. Many times I called Holley and ask why it wouldn't tune itself. During the day, wot, the pressure would drop to zero and a few seconds later it would stumble. Before you start tuning the acceleration enrichment, make sure your VE tables are dialed in. 02/1. You're not surging when you accellerate because the power-valve is open under laod and richening up the mixture. Tips include: How to check for the clearance be. When you accelerate AFR on the handheld swings as low to 8-9, then climbs back up. EFI sniper installed and dialed in perfectly as per directions, starts, stops, idles at 750-ish drives great. 19 Apr 2016 It seems from 20 to 45 mph it stumbles, kind of sputters like it wants to die. If you are experiencing a bog or hesitation off idle, you can try a larger, higher # shooter size. Apr 22, 2020 · It dropped lean for a second or so, into the 17s and 18s, then settled back in around 13. Check out https://www. Any suggestions? Thanks is advance. "No such thing as NVH in a Mustang". Is it possible to drain a carb dry under Jun 24, 2020 · If the system is having hesitation or bogging issue, and your IAC steps are between 3-10 at warm idle, then your next step would be to adjust the accel pump function to increase or decrease the fuel added on acceleration. Listed in release order! (Not listed but in development - Silk, Beautiful, Shrink, Sicario 3, Herschel Greenbaum, Amnesia, Battle Los Angeles 2, Every Last One, War Correspondents) 3. Holley Sniper EFI BBD master kits will be right at home on any powered trail rig or weekend cruiser. This set of Computer Organization online quiz focuses on "Hazards of Processor Architecture". As do a few other FiTech users. I'll show you some tips on how you can get the most out of your Sniper EFI system and your engine by creating a custom timing table using our Sniper EFI software and your personal computer. Also, I show you how to activate and use the remote overlay function in the holley Aug 28, 2015 · Then acceleration-induced fuel tsunamis inside the tank push the fuel away from the pickup. Apr 23, 2019 · Rich bog during acceleration. Have you looked at your base fuel table and messed  Holley 550-511K Sniper EFI Kit maestro de auto-ajuste: Amazon. I had a 600 vs Holley on my old 82 C10 Blazer with a 350 throttle body engine, and it was fine - though my camshaft was smaller than the 270 in the engine you are talking about. 2) Accelerator pump nozzle has dirt in it. Too much leaking air can be introduced into the fuel intake by suddenly applying the accelerator pedal, temporarily starving the engine for enough raw gas to ignite. The engine is a basically stock 454 with a Performer RPM dual plane intake, a 750 cfm Holley, and headers. 0 to 55. Sent the junk Eddy pump back to Summit and ordered a Holley electric pump and no issues ever again. I have been trying to tune out a tip in stumble. A carb running rich, as well as a carb running lean, can cause an off-idle stumble or hesitation upon acceleration. I know there is different ways of doing it but which one is best? Anyone ever try the Holley sniper kit? Any help will I'm running a 385 SBC stroker with RHS aluminum heads, MSD ignition and a T56 Magnum in my Camaro. My biggest issues of course come with tuning. I believe a carb would make more power but this will offer better driving. It started stalling random times yesterday. Check for restricted fuel filter or lines. I have played with this quite a bit and maybe I am expecting too much from this carburetor. Jun 09, 2017 · Car ran great prior to SNIPER install with 750 holley single pump single feed SAME radiator but since have upgraded to dual 11″ fans 4400 cfm up from twin 10″ at 3500 cfm. I even put smaller jets in the primaries trying to get better gas mileage. Conversely, a heavier vehicle with a smaller engine can benefit from using a stiffer spring to avoid a stumble upon acceleration. If this is the case, the idle jet needs to be larger or the air corrector smaller. Holley Carb Tuning: Learn From The Experts At Holley Convert That 4160 to a 4150 So you bought a newer 0-3310 vacuum secondary 750 Holley for a great price, but later you realize it is the 4160 style with the secondary metering plate. I pulled the air cleaner and sprayed Gummout on the linkages, choke plate, and air bleeds. Read More Holley just brought EFI within range - introducing Sniper EFI! It’s economically priced so you can have all the benefits of EFI and still have money to finish or upgrade the rest of your ride! Perfect for street rods, muscle cars, off road trucks or nearly any carbureted vehicle. The Sniper works with a dual plane manifold but some people have experienced noise issues. Air-fuel ratios, ignition curve, idle speed, acceleration fuel, coolant fans, and rev limiter adjustability Works with a return-style fuel system or can be used with a universal EFI fuel sump Self-learn is compatible with boost from turbochargers, positive displacement, and centrifugal superchargers Toggle right Slidebar. So, with Gateway’s blessing, Dorvillier brought the Bronco to the Edelbrock Garage to see if the Pro-Flo 4 multi-port EFI was the answer. 4 Powertrain Control Module (PCM) CM-12A650-A5LA (5. This install is on a 2000 Ram 1500 2 door short bed full size truck. They put an end to I'm getting ready to install a Holley Sniper EFI TBI system and am researching the best way to do the fuel system. Is it possible to drain a carb dry under Holley Sniper Xflow. Start the car again and test the acceleration for a smooth, crisp feel and sound. In the last year I have been struggling to fix a consistent hesitation I get under acceleration after it warms up. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. Other than that only real issue is a solid hesitation/stumble on acceleration when not rolling. Members Moderators. Jul 12, 2013 · On the other hand, if the hesitation occurs under rapid acceleration increase the size of the pump shooters. That's exactly why sniper Rafi allows anyone using their built in timing control feature to build a custom timing table. The rear float bowl level is lower than the front to keep fuel from pouring out into the carb throat under heavy braking. Oct 13, 2009 · Holleys are VERY sensitive to dirt. es: Coche y moto. I have a Holley 750 on it now. You would have to take the top off, remove the jets and check. the only mods needed would be the fuel supply, connect the coolant temp to oil supply and weld in 02 bung for 02 If your GM vehicle has an inline filter it may cause the tach to drop to zero on acceleration. Unscrew the fuel pump nozzle screw with a screwdriver and pull the nozzle out of the bore using needle-nose pliers. These full-featured throttle bodies are easy to install, can support a lot of horsepower, and will keep your budget intact. With Holley Sniper, 3. There are more than 33 items, which if faulty, that can cause engine hesitation and stumble problems. I have a 454 stroked to a 496 with a Holley Sniper throttle body. 31" tires 3. Sniper is too new for me to know anyone using one other than Rel3rd here. Hydramat Apr 30, 2018 · 1 Sniper Stealth 4500 (550-841 Shiny, 550-842 Black, & 550-843 Gold) Holley Sniper EFI FUEL INJECTION INSTALLATION MANUAL My Bronco with Holley Sniper EFI was running poorly. I chose the Holley XFlow ( 900 CFM supports up to 800 HP ) system along with the Hyperspark distributor, control box, and coil. My guess would be that it is running lean and as suggested, guessing its a thermoquad, your accelerator pump needs attention. I'm talking a 2" high shot of gas. My car idles fine just sitting but when I come to a light and push in the clutch to stop, the RPM's will fall and over shoot my idle (850) and the car almost stalls and then the IAC tries to recover and it surges for a few times trying not to stall before it stabilizes at 850 again. The new Holley EFI systems have a 31 x 31 cell Fuel Table (that's enormous). Ford's Central Fuel Injection (CFI) was based on the same principle of injectors in a Nov 06, 2020 · Backfires get their etymology from firearms parlance when explosive force is released through the breech instead of the muzzle of an unreliable firearm. Jul 14, 2017 · Holley notes that if you come up with an even number, for example 16” Hg, which divides to 8 and see that we do not make that specific size power valve, round down to the closest size (7. Sep 04, 2018 · According to Dorvillier and Gateway Bronco CEO/President Seth Burgett, there were just too many issues with the Holley Sniper TBI that couldn’t be solved, even with the help of Holley Tech Support. I may need to order a secondary cam kit to get that ironed out and maybe a bigger squirter, otherwise I think it's pretty damned good. It also fas a tad bit of hesitation off idle. After this starts, it also develops a problem idling, by surging and slowing until it stalls. Nov 19, 2019 · All the doors and windows are open when you hear the sound of some distant small-block losing the battle to accelerate. It worked, but I did have a slight hesitation on acceleration. If the vehicle is light and the engine is large, a lighter spring can be used to accommodate a faster engine speed increase. The car runs good, but leaves a lot to be desired. First things first…. your AE vs TPS/MAP RoC Blanking values (in Fuel Modifiers/Fuel Control): If they're 15 & 7, those are the old values from the V1 firmware. Scoop is absolutely right, use new gaskets only when you put it together. If your car stumbles or hesitates during 1985 Ford Bronco Eddie Bauer. When I researched the available options everything considered: cost, drivability, support, parts, etc this came out on top. This will tune the throttle plates to open correctly, allowing for smooth, crisp acceleration. 1 being rich and 16. ACCELERATION ENRICHMENT: Changes the “accelerator pump” function of the fuel injection. The traditional Holley 4150 twinbowl, 4-barrel performance carburetor dates back to 1957 when it was first installed on new Fords as original equipment on the 312-ci Y-Block V-8. pump shoots the fuel. With that, I would like to eventually drop a Holley Sniper EFI kit on there and call it done. Read this Connecting Sniper EFI Touchscreen LCD to Sniper EFI . The FordSix Performance Forum - The First Place For Your Six! A discussion board dedicated to the Ford Six Cylinder Engine. realstreetram. A simple adjustment to -2 fixed 90% of the stumble and I settled in for now at -3 and it has not stumbled once. Feb 15, 2019 · my car acceleration is very bad with fi tech and head working I thought I'll be the first but i failed vs nova 😐 Click for thumbs down. Assuming accelerator pump is either undersized or has a ruptured diaphragm. Holley has been the undisputed leader in fuel systems for over 100 years. Many tuners jump straight to this part too early. If I take a ten mile Aug 14, 2006 · I had the same problems with my 600 Holley. 035 (primary Nozzle/squirter), stock . Sep 05, 2009 · I've got a holley red pump and regulator, set to 5 1/2 psi. Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. DUI ignition. He said my low idle was causing it to over fuel at acceleration. 32" BFG KO2 A/Ts. Holley carbs run on the idle circuit up to about 2000 RPM at light throttle. Although if you have just had the carby apart and reco'd it. 0 Click for thumbs up. So much for the FAST “lifetime warranty”. I have been reading the forum for about 3 years, but this is my first post. This weekend, I was once again working on a guy's car that was suffering from eratic idle once warmed up, and the idle mixture screw on the passenger side Ive installed numerous units at work. I've got a holley red pump and regulator, set to 5 1/2 psi. to be the same distance) the engine is stumbling and sometimes backfires and seems to be missing. Is so turning At part throttle while driving you can hear it stumble for a bit. Holley’s relationship with Ford is well documented. Idle quality can usually be enhanced by using a carburetor with venturi boosters in the main venturis (the narrow part of the carburetor throat), or slightly smaller venturis. The replacement HEI did the same. We were very happy with the performance of the EFI system. We're trying to tune it and set the idle. carb, a standard transmission can use a Double Pumper carb. Properly setting up Hollys accelerator pump. At what point should fuel acceleration be messed with? When I stab the throttle, the engine stumbles. As soon as the pump sucks air, fuel pressure drops to near zero, the engine stumbles badly, and you’re Holley sells individual cams or you can buy their kit which includes an assortment of cams to choose from. 55 gears, Holley Sniper, Lund tuned E85, 47lb injectors, , 170 degree t-stat, 3in. Each and every Holley power valve features a stamped-in number that corresponds to the valve opening point. But you can get the same thing in manual choke if thats your thing. 1) Vacuum leak. They are available with huge 105mm or 95mm bores--and low rpm, drive-friendly tapers. Hesitation or Engine Miss Upon Acceleration. With a specific calibration for improved off-idle and cruising performance, this carburetor eliminates the hesitation – and subsequent frustration – associated with a mismatched or poorly tuned carburetor. Holley's Avenger EFI system isn't unlike those first throttle body injection (TBI) systems of the 1980s. I find that it stumbles on takeoff, and most of all falls out in my final gear. Locate the throttle plate cam on the driver's side of the carburetor and adjust the cam pin higher or lower to retard or advance the throttle plate operation. Im new to this site and am trying to find some good info from readers on Holley carbs! The problem I am having is at idle tooooo rich! Float level is good air mix screws 1 turn out and still way rich at idle! My combo is 468 BBC 10. I have a '78 Camaro with a 350cid, Edelbrock intake and Holley 6777 650 DP carb. I think im having a fuel issue. This is also smaller than most of the adjustable ones, and may be easier to mount. 9 2. Holley carbs come with a standard shooter size which differs by carb list#. I also have raised the accelerate pump (Acceleration Enrichment) from 49. Conversely, if off-idle accel-eration does not feel crisp or clean, then the pump nozzle size may already be Yes. 6 to 1 on an initial outing with a new setup. Change the AE vs TPS RoC Blanking value to 4-6. This bolted on and needed just minor adjustments to throttle cable and fuel line. If I try to take off with a bit more throttle, either from a stop or while rolling, the car hesitates which  Stumble on fast acceleration - Fitech EFi Tuning Forum If the system is having hesitation or Holley just brought EFI within range - introducing Sniper EFI! A central point of tech info and knowledge from the Holley team and Sniper EFI users. fuel level is below the sight plug on the float, adjustment screws are about as lean as you can go on the carb the idle is about 850, if i mash the gas it shoots a fireball out the carb, there's some preignition when i shut the car off, and it's definitely running rich Dec 01, 2019 · Stumbles at 1/4 throttle usually point to simple tuning issues. I did find one issue that Danny thought of, Ill just quote him here: "Acceleration Enrichment can't be tuned until the Base Fuel Table is well tuned. Jul 28, 2017 · and bolts. And If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon acceleration, more than likely the carburetor needs an adjustment to the accelerator pump assembly. be/1mIhs4x We talk about some common causes and solutions of a hesitation off idle. It adds fuel based on how quickly the throttle is opened. When you mash the throttle The Sniper EFI System will absolutely work fine in your rock crawler, Todd. 12 3. Holley also supplied the three deuce carburetors on the 427-ci high-performing engines for 1968 and 1969. Raising the number increases the amount of fuel added when the  10 Jul 2017 It is stock other than an edelbrock intake a and a Holley 600 carb. It really brings out the best in the 2F. A little background, 545 AFR heads, Torker II custom cam By the Mad. April 23, 2019, 4:05 am G'day Everyone. These units offer superior throttle response and WOT power over the carb—and you will likely experience increased fuel economy. The pump shooters only serve to provide the initial shot of fuel, and together with the idle circuits and transfer slots they provide the predominant fuel supply to the engine until the main circuits are operating through the boost venturii. E-Tuner 4 App is available free from Google Play Store, Android devices will receive automatic App update notifications as Edelbrock Jul 16, 2015 · Holley’s HydraMat has created an interesting alternative to these ideas with a simple product that you can think of like a bionic sponge. The challenge will be what you call the "right fuel system". Mar 28, 2013 · I have a weird stalling problem that I am trying to fix. 5 inches (the max available from Holley) to get them to actuate at the right time during heavy acceleration, but not during normal I explained using the Holley Sniper EFI on the Opel engine and he recommended the PA-2 pump kit. 2020 by ciciv Sep 18, 2016 · 2017 Mustang GT- Oxford White, 401A, Auto, Black Out, 3. It could also mean the vacuum tubes are hooked up incorrectly. In vehicles, backfires are usually of two kinds – first is where gases are expelled rapidly from within the intake manifold and the … This type of control will result in a smoother idle, faster acceleration, better peak power, improved fuel economy and the ability to control detonation, all with the touch of your finger in the E-Tuner 4 app. Once the problem has been diagnosed, you will be provided with an upfront quote for the recommended fix and receive $20. I will be buying another for another build with a Holley Carb shortly. Corsa Sport, 1 7/8 headers, PMAS Intake, BMR Lock Out, Black Steeda Diff Bushings, 20% tint. One of the defining features of the AVS2, is the annular b oosters in the primary venturi. The accelerator pump system adds fuel as the throttle valves are opened. 750 holley Post by rewguy » Thu Apr 14, 2016 12:52 am just as i roll on the throttle gently (off stoplight street driving) the carb has a small rough chug that it works its way through but it disappears by 3000 rpm. Clean it up and clean it out. Since my first post about this issue I have added a Holley Sniper system and dual sync distributor. Is it a "flat spot" or is it a stumble? If your accellerator pump is spraying too much fuel, it will mostly flood (stumble)for a second, until the engine speed comes up enough to accomodate the Hesitation or Stumble When Accelerating Hesitation is a classic symptom of a lean fuel mixture (too much air, not enough fuel) and can be caused by a dirty or misadjusted carburetor, or one with a weak accelerator pump or worn throttle shafts. How to Build a Power Tune Holley Carburetors. The 4160 is what everyone seemed to recommend for that engine (at least the people who weren't Holley haters!). 14 Apr 2018 If I roll on to the throttle, the car accelerates well. The car started easily, idled very smooth, good acceleration and a noticeable power increase. Less than one hour and my Scout was running without hesitation and very smooth. It should reset the fuel tables if you changed the CID and cam information, but I don't really know how the Holley software works. I've made sure my IAC is between 2-10 %, and my timing is on point  (Resolved) Laptop tuning only. what should i expect regarding power/mpg would i be able to control timing through the sniper with this set up Tell me your thoughts/ recommendations Sep 04, 2019 · Pressure was 6. Ordered one and received it today. Hesitation, stalling, stumbling, flatspot, or deadspot during acceleration: Backfiring or spitback up through carb. 19 Nov 2019 The engine stumbles, coughs, and then accelerates. Tired of messing with it. TBI definition  18 May 2018 I was having a bog off idle when during hard acceleration. 4 to 1 depending on the cooling system and the tuner’s experience. 027 (rear nozzle/squirter), stock power valve and jets (replaced), upgraded red/maroon cam, replaced needle/seats, cleared all carb Holley Sniper EFI BBD Master Kits. stumble on acceleration, engine overheating, cause a lack of power,  9 Apr 2019 Top 10 Holley Sniper EFI Tech Tips, Holley Technical Training Manager's top ten "suggestions" for Holley Sniper EFI System installation issues. I adjusted the secondary fuel bowl level down (was nearly at the top of the sight glass and there was a hesitation on heavy acceleration). 1:1 CR, roller rockers, EFI manifolds and 2. I know it has auto learn for fuel but there will still be some smoothing that you need to do. However, I've heard a few people mention problems running pump dry on acceleration or cornering. I am still tweaking some parameters to improve WOT acceleration and eliminate bugging. Sniper EFI 2300 Series (4) 90-day Holley limited warranty Anticipated Ship Hesitation during acceleration. See all 18 photos. I am also planning to get the Holley distributor and Sniper fuel tank. The Dodge Dakota is equipped with an idle control valve. You both look at each other and nod knowingly… We've all been there. Insert the screw and tighten slightly. A backfire (lean condition) on acceleration also calls for a step up in pump nozzle size. In between the failed FAST parts, I was able get the systems running well. This will minimize the chance of producing metal chip particles. From Sep 21, 2013 · This is a small video to document a medium case of EZ-EFI idle surge on a 1976 Dodge 318 engine in a 3/4ton chassis. CHEVROLET | GMC | CADILLAC 1998-2002 CAMARO | FIREBIRD 2010-2015 CAMARO Fit exactly as it should and worked perfect on a Holley Sniper unit. " Now later you can use the smarts of the Sniper ECU to control your ignition timing. 5-14. 1) Check for vacuum leak and fix it. Holley 0-80457S - Holley Model 4160. I've ran the Sniper EFI system with the Holley dual sync on my old engine (SBC 350) with no issues. AF Targets 10. Backfiring caused by internal carburetor problems is a result of a defective accelerator pump. Stumbling or hesitation, while driving, points to a vacuum leak or improperly set choke. When choosing a fuel pressure regulator for your ride, you need to take into consideration several factors. The most popular service booked by readers of this article is Engine is backfiring Inspection. Brodix BB2 heads and 4500 intake with an adapter for a 4150 carb MSD dizzy and 6AL box! Aug 25, 2019 · -- WOT / heavy acceleration I would get stumbling. 3. Many people have had good results with Tanks Inc's setup. I used a Sniper on my Pontiac, and I'm pretty happy with it. 9 Jun 2017 C3 Tech/Performance - Holley Carb DP Off Idle Stumble - I have a destroked The problem I am having is off idle on light acceleration like pulling out of If this car was not old school I would stick the Holley Sniper EFI I have  1 Jul 2004 or the Holley 4150 HP, blower carburetors available from Barry Grant. 10. Much like the pump shot of a carburetor, the Sniper has an acceleration enrichment feature that provides fuel on throttle tip-in. holley sniper stumbles on acceleration

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