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Holley sniper rough idle

Holley sniper rough idle

1 Holley Sniper EFI system will run $1000, plus a $150 fuel tank from Tanks, Inc. This problem has been getting worse over the last 2 years. 3L Vortec and 700R4 transmission. And still a rough idle when on the gas truck runs like a champ!!!! When under load and slight throttle on small incline can feel the truck surge/Skip Snap on Verus has no data and no codes in system. It can be revving up to 3000 rpm and if you punch it just dies immediately and won't recover. Page 3- Holley Sniper EFI Planning and and it was running rough. For example: a 9-inch vacuum reading requires a 4½-inch power valve. The typical idle circuit. Holley Sniper EFI is a perfect match for any muscle car, classic truck, street rod, or nearly any other carbureted vehicle. 6 volts when acutated. However, if done wrong, you’ll wind up with stalling, pinging, and a rough idle. I'm looking for any info anyone has on the installation on a Jeep 4.


fuel pressure. . i have set timing 12 to 14 deg adv. Considering buying a Holley Sniper EFI system and Holley distributor. Does your stock or mildly modified Pontiac engine idle higher than it should because each time you try to dial it down, it runs rough? IDLE AIR CONTROL MOTOR Replacement Idle Air Control (IAC) Motor for Sniper EFI TBI Systems, Sniper 90/92/102mm Throttle Bodies, Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950 & Digital Pro-Jection Systems. When setting the choke idle start on the highest bump on the cam, set the desired idle speed when cold. I can play with the choke and watch the meter and know right when I get into the choke as it goes from a rough idle lean cold miss to slightly rich and smooth. NEW BG PRODUCTS COMPLETE FUEL SYSTEM CLEANING KIT 2 CAN KIT CF5 POUR IN GAS ADDITIVE PN 203 Fuel deposits that build up on intake valves, ports and in combustion chambers in high-efficiency engines can cause serious drivability problems. It's idling rough and seems like it's getting too much air. Started to notice a rough idle, engine sounded like a motor with an aggressive cam. fuel level is below the sight plug on the float, adjustment screws are about as lean as you can go on the carb I am nearly ready to just pull the trigger on the Holley Sniper EFI I just got a 2001 Chevy 5.


574/. com, the official website for Hot Rod Magazine. Some I’ve seen have 85’s in them. The screw is a little hard to get to unless you have a aftermarket manifold then its a not to bad. Model specific subject matter experts, classified ads and more. It has a rough idle and black smoke from the exhaust. I have checked for a vacuum leak and have found The engine runs beautifully, with perfect idle at 650 RPM, but every now and then I hear the IAC give a sort of "snap" and the idle is at 1200 RPM. For mild cams, an idle ignition timing advance of approximately 16-18 degrees will do. The Trans was rebuilt but needs a new output shaft as the one it had sheered off. stalling rough idle flooding hot start economy hesitation acceleration surge backfire power stalling (cold) (cold) holley carburetor trouble shooting chart low vacuum, rough idle Page1 - Discuss Super Chevy, Tech Talk, and Chevy Technical Discussion topics in the Super Chevy forums at Super Chevy Magazine. 96 Pontiac TA (6 speed).


adjusted as best as I can. http Holley carburetors have idle mixture screws that control the air/fuel ratio at idle. 90 rear gears. This quick walk-through will get your Holley carb up and running with a perfect idle in no time. The idle smoothed out mostly but it's still a little rough and still smells rich. , coil, and 6AL. 5 new power valve and 53 main jets. Then I shut off and turned back on and it ran really rough and was idling so slow I could see the fan and balancer turning. Got the Holley Sniper EFI installed on a fresh Ford 289. Wouldn't shift into 3rd. low vacuum, rough idle Page1 - Discuss Super Chevy, Tech Talk, and Chevy Technical Discussion topics in the Super Chevy forums at Super Chevy Magazine.


I wasn't able to adjust the idle anymore, I set the timing at 15 deg and the warm idle at 750 rpm, turned off the idle spark control and checked the timing on the crank. fuel is coming out of the idle transition slots with increases as more of the slot is exposed to the vacuum below the throttle blade. I installed Holley Sniper on three other Mavericks here in Brazil and the problem also exists. Adjusting the Holley carburetor can be done in just a few minutes, but the screws must all be adjusted to the same RPM level on the vacuum gauge. Since Holleys are so easy to adjust To start off, I replaced a Holley 4bbl carb mounted on an Offenhauser intake. I have a Holley 600 vac sec. Then it would not idle. Hey everyone. That vacuum circuit isn't leaking however. t56 trans with 3. As soon as it warms up, it starts to idle rough, between 500 and 750 RPM.


Holley four-barrel carburetors are probably the most common high performance fuel mixing devices on the planet. An idle system will have an idle jet/restriction that must be changed to supply the desired fuel mixture for idle and off idle engine demands. The TPS checks out ok, varies from . HOLLEY SNIPER 550-511K EFI 4150 4-Barrel Self-Tuning Master Kit - $1,259. Hook up a vacuum gauge if you have one, if not, watch the tach. Lean mixtures also increase the risk of spark knock (detonation) when the engine is under load. The fuel pump was replaced because it was only putting out 4 psi. I called Holley and the tech told me that a bad PCV would cause those symptoms. Runs like it's missing a cylinder or two. First off, it's a stock '81 with the 1bbl carb. If you have the air/fuel ratio set properly and your engine can idle somewhat decently, even if it's by holding the throttle pedal down off closed-throttle to keep the engine from stalling, you can begin by setting a ball-park ignition advance value.


I know my cam is to blame to a large degree. also rec. 578 lift). The typical idle circuit on many modern downdraft carburetors will consist of: (A) an idle jet, (B) the idle bypass, (C) the idle restrictor, (D) the idle air-bleed, (E) the idle passage/port, and (F) the idle mixture screw. Plugs look nice and light tan. 1965 289 rough idle at start up help! (update)!! Update!! Ok so I put in all new plugs today, 2 new carb breather hoses (front and rear) and tightened them both up real good (both were old, cracked, loose and probably original) plus a new PVC valve so will update y'all tomorrow when I do a cold start and see if anything improves. We got the engine in and made all the required hookups and proceeded to fire it up. Re: Holley Sniper or FiTech throttle body injection My buddy replaced his well tuned Quick Fuel 650 with a F. hotrod. The setup is currently not controlling timing, running only a mechanical advance distributor. If there is a fly in the Holley ointment, it’s setting up the idle.


Adjusting the idle mixture screw does NOT change the mixture of the carburetor! Please read on. Put an end to mysterious air//fuel ratios, jet changes, and cold-start rough idle troubles with Sniper EFI. not knowing which cam timing set rough guess. Has an automatice tranny and is 2wd. If done right you’ll have a perfectly smooth idle. Hi ya, so did a search looking for info on the Holley sniper EFI kit. Holley Sniper 550-511K EFI 4150 4-Barrel Self-Tuning Master Kit Sku # 425550511K Mfr. 8896 1050 Holley Dominator with annular boosters. What Causes a Car to Run Rough? Reasons for a car running rough can include problems with the engine temperature or oxygen sensors, bad hoses, ignition system or timing problems, clogged air or fuel filters, and faulty spark plugs or fuel injectors. Found out that the Holley EFI is set up for Dodge IAC not a GM LS type,(same plug). There is an idle circuit in the rear barrels of your Holley, too.


2 '84 K starting and the engine should run at a high idle and fairly smoothly. Is it more carb than needed on this engine, yes. If it is rough and sputtering like it Holley Dominator carb will idle cold take 5 min to warm up ,turn the idle up and turn idle down later to make it - Answered by a verified Classic Car Mechanic I've got a Holley 1 barrel that's giving me problems. I'd suggest performing a leak down test on the engine. Holley 2300 side hung float. Just installed the New Edel heads, RPM manifold, Erson roller Rockers and New Holley 670 Street Avenger on the a 390 running 280H. Incorrect timing can lead to the fuel being ignited before the manifold intake valve closes, causing a backfire through the carburetor or exhaust. Idle BasicsAll carburetors come with a simple yet efficient idle circuit. We were fighting Tach signal, found I had to ground the case of the second strike box we were using for RPM signal. 030) with the L-79 cam (222 @ 50 w/ . Ran fine, though slow idle was too fast.


073 IAB and it would still idle rich with the screws 1/2 turn out but then it would go lean during lift throttle light load cruise. Idle: The idle circuit supplies fuel when the throttle plates are open only slightly. The engine was running fine. Occasionally, though, buildup from impurities in the fuel, or injector system electrical or mechanical problems may contribute to rough idle, misfires, harmful emissions, poor engine performance, and fuel economy. I am also planning to get the Holley distributor and Sniper fuel tank. The camshaft in this motor is a hydro roller at 650ish lift, needles to say now it is smooth as silk. Economically priced to save your hard earned money for other parts of your build; Holl One of the most difficult jobs on a carburetor is getting the proper idle mix. Most compression BBC's like lots of initial/low end spark advance. 5 volts to 4. For engines to run efficiently, the spark plugs have to ignite the air and fuel at the right time. This is the second rebuilt carb from the auto parts store and they're both acting the same.


Holley Sniper EFI owners and Tech has 7,708 members. But it came attached to the engine I swapped in a number of years ago. Primed the filter, truck started right up and idles smooth for about 1 min. You are right about the intake gaskets, it's rare but it does happen. ROUGH IDLE AND VACUUM LEAKS: If a rough idle persists after the engine has been started and the mixture screws adjusted, check for manifold vacuum leaks. Economically priced to save your hard earned money for other parts of your build; Holley Sniper EFI is a self-tuning, plug and play fuel injection system that takes all the trouble and guesswork out of your switch to modern electronic fuel injection. I will fire it up tomorrow night and finally get this thing to idle. From The Community. Also helps idle quality. 454, Holley HP MPFI with FAST dual synch and LS2 coils running sequential. I put a "B" intake manifold on the engine and a new Holley Model 4160 465 CFM carburetor.


I know they're others, like the Howell, which a lot of people seem to like especially if you need it to be emissions compliant. Replacement Idle Air Control Motor for Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950, Sniper 92mm/102mm Throttle Bodies & Digital Pro-Jection Systems. It seems to drive just fine, but as soon as I let my foot off the gas, 90% of the t I did this with a stock freshened 460 in a 1974 trailer special. The Holley one-barrel carburetor is the simplest of the Holley designs, with one intake bore, one throttle plate and one fuel delivery system. If this is your first visit, be sure to check out the FAQ by clicking the link above. note: i Jmarkaudio, I already did what you suggested with the e-bleeds after reading a thread on YB about 4150 metering. If the problem is an intermittent concern then it is most likely not base engine, but rather something in the controls. Cam is a bit rough, xe284h (110 LSA, . One of the most difficult jobs on a carburetor is getting the proper idle mix. We the top 10 common EFI mistakes and how to patch them up so you don;t make a costly mistake. when I shift into drive/reverse from park, or spin the steering wheel alot when at a standstill, it'll drop down to 400 and get really roughI don't think I have a vacuum leak anywhere ,I've looked hard.


Bronco Holley Sniper EFI Self-Tuning Kit Shiny Finish Installation Holley Carb - Setting Idle Speed Correctly - Duration: I've been dealing with this hunting issue with the terminator for years so I'm getting pretty good at fixing it. I've been having some problems with the idle on my A4 LS1during normal idle, it's sitting at 550-500. Idle System This will keep the idle fuel adjustment easier to tune and also keep engine from running on when shut off. I was out on some washboard roads the other day (some pretty bad ones) and ever since then, the engine won't idle. carb and a mild performance camshaft. what a drastic difference. and the idle air bleeds. Find many great new & used options and get the best deals for Holley Sniper 550-510K EFI 4150 4-Barrel Self-Tuning Master Kit at the best online prices at eBay! Free shipping for many products! The only thing the turn signal and radio have in common is the ignition switch, and if that power feed contact was the problem then your wipers would also be inoperative at the same time. You probably remember me, but Ill remind my specs anyways. Dodge IAC would not bolt up to my Edelbrock throttle body, so I changed two wires in the connector per Holley Tech Dept. 5 high flow power valve.


A vacuum reading on the engine at both idle and fast idle would be the easiest thing to check when trouble shooting. To start off, I replaced a Holley 4bbl carb mounted on an Offenhauser intake. Kinda rich, but if I lean it out any, it starts to run a little rough. Dominator® EFI Vehicle Management Systems are intended for all engine applications, from street to unlimited high-end racing applications. holley 3310-c 4 speed trans 3:50 gears vaccum about 15 at idle Issues: 1. In this video I install a Holley Super Sniper EFI system on my #FairmontProject. The truck has been running fine but today on the way to work I stopped at red light and it started idling rough. 2 corner idle, 30cc pump primary, 50cc pump secondary, all non stick gaskets 6. 5 inches of mercury vacuum. this is the holley off idle. If the engine is not idling around 1,600 rpm on start up, the fast idle screw will need to be adjusted.


i got up early and went hunting this morning and i was still half asleep when i left but i noticed that when i started my truck it ran rough but didnt think nothin of it but after i got done hunting i went to get fuel and i noticed it was blowing clouds of white smoke and at idle it was rough. If the engine you are working on is equipped with a power valve (no metering rods), the main jet size is what determines the A/F mixture that will be delivered to the engine at light-load/cruise speeds. Given the sheer numbers of carburetors made since the 1950s, you know they work. Got in, turned over on 2nd try, but died, so closed the choke just a bit more and tried again. We set the fuel pressure to 43psi. For reference I have ran a Holley Projection 4Di about 20 years ago. I am still running a 6 volt system. 2 inline 6. I was running a Demon 750 carburetor but I felt I took that as far as I could go. Truck idles ok in park, but when i shift into gear(any gear) the idle becomes rough and chopper and almost feels like it wants to die. An 85 power valve opens at 8.


These could result from unplugged vacuum fittings or a carburetor flange gasket that was torn during installation. the idle transition flow is limited by the idle feed restriction. I put new intake gaskets on and that only got me like an inch more. Keep in mind that if the idle feed restrictor is enlarged too much, it'll have to be removed and replaced. However this did not take care of the idle problem. I gained a little by fine tuning idle mixture and one jet size on the secondaries, but I was pretty close! (With the timing optimized and the carb tuned on the wideband, it passed the IM240 smog test with flying colors! Not bad for a dart-headed 306 with a Comp Cams 270h cam, offroad exhaust and Holley double pumper!) One of the most difficult jobs on a carburetor is getting the proper idle mix. The motor needs new lifters and at the same time I would like to add a new intake manifold for the Holley Sniper EFI. The rough idle and jumping while driving could be caused by multiple things. Re: Holley Sniper EFI How does it run with the carb on it? anything unusual? stumbling, rough idle, stalling, black smoke out the tail pipe? if it runs good then I would look else were for your problems, when I bought my Jeep it had a pin hole leak in the gas tank making it smell bad but not enough to drip on the ground just on the skid plate. Both sides are jetted differently. One of the signs of a vehicle with a rough idle is a faulty Idle Air Control (IAC) Motor.


idle air screws, used to lean out or rich fuel air mix. New one did not work. CompCam(306), Mac Headers (mid length), BBK 52 mm Throttle Body, Ram Air Power Hood, Accel 26 lb injectors, Aeromotive adjustable Fuel pressure regulator, Holley high pressure fuel pump, 2 chamber Flowmaster, 373's and a custom dyno tune. Here's what I've done so far 1) Checked lifter preload thinking the valves were being held open by to much pre load. Remanufactured Holley list # 4778. If your car has a camshaft with lots of long timing chances are it idles pretty rough and has low manifold vacuum. I can solve this by adjusting the fulcrum distance on the throttle arm. 31 in it not sure if I need to go smaller or bigger Holley four-barrel carburetors are probably the most common high performance fuel mixing devices on the planet. A rich fuel mixture An idle system will have an idle jet/restriction that must be changed to supply the desired fuel mixture for idle and off idle engine demands. On manual-transmission applications, a standard 6½-inch power valve is adequate if the vacuum reading at idle is above 12 inches. 5 and 7 psi.


Using a test light and backprobing old plug wires i narrowed the skip too cylinders 4-5 Checked compresssion on those 2 cylinders and 110 psi. 082" intermediate, and #40 main. im thinkin possibley an injector is hung up just dumping fuel in The system has a better control over the air-fuel mixture under any driving conditions. Off idle response and power is fine, but once the engine returns to idle it pops, shakes, and misfires. An erratic reading could point you towards weak or broken valve springs and definitely cause a rough or erratic idle. It's on a '64 Dart GT, 225 Slant. On a Holley, the fuel comes out a little hole below the throttle plates in the baseplate. A. The Idle Air Control (IAC) is a stepper motor that controls the amount of air by-passed around the throttle blades to maintain the commanded idle speed. Idle mixture adjustment on 1975 Ford 2. But in some cases, including large displacement engines or those with lower idle vacuum, you may discover the engine sometimes stalls when the throttle is closed quickly on deceleration.


Adjusting the curb idle and mixture screws do not seem to do much, I've done this in neutral like it is supposed to be. T. The first time I try to start it in the morning I have to manually flip the valve closed. running on a 327 (. Part # 550-511K Condition New Brand Holley Sniper Sold Each Details Info Put an end to mysterious air/fuel ratios, jet changes, and cold-start rough idle troubles with Holley Sniper EFI. Sound at tail pipe was rough too, putt putt, and some black smoke. found that the ignition is not wired correctly to turn off the car. Maybe this has something to do with not being able to get the idle Ive been having some problems with my 95 gst. I am running a Holley 2bbl Pro-Jection system on my 304. I had my idle dialed in and then I changed my intake manifold to single plane. Put an end to mysterious air/fuel ratios, jet changes, and cold-start rough idle troubles with Holley Sniper EFI.


The throttle body also houses a fuel pressure regulator that's pre-set to 58. S. But unfortunately I came up with nothing. And I felt it was easier to get the 4bbl Sniper than to swap back to a stock intake. Pick a screw and turn it 1/2 turn one way or the other. Started idling rough so I took it for a short drive. Ive been having some problems with my 95 gst. The engine is a turbocharged 363 custom small block Ford. Turned on and off a few times while I checked hoses and connections. I fully intended to have a much higher than stock idle speed, but not like this, I can live with 1,000-1,200. Returned to shop.


Carb comes ready to run. It was between that and the FiTech unit, I've been on both FB forums for months for them to see the general issues and set up issues. Peak HP was good, but we just could not get it to run anywhere near as smooth as the carb runs. _____ Let's use my favorite, a 750 Race Demon with 4-corner idle and full mechanical linkage as an example here. The primary side is the most used and has the idle adjustment that feeds fuel from below the throttle plate. It only comes back to normal if I turn the engine off and on again. and now the IAC moves the way it should. and a $540 Aeromotive Phantom 200 EFI sump pump kit and plumbing brings the EFI to ~$1700, but the added drive-ability pays for itself and I can sideline the manifold until next year when I can pick up a second Holley Sniper. I do think you bring up a good point as far as adjusting the TPS and Idle because I adjusted the Idle before I did the TPS, but the Idle didn't seem to change once I adjusted the TPS so I left it alone. The fast idle speed adjustment is set at the factory and should give about 1,500-1,600 rpm at cold start up. My issue I'm having is getting the idle to smooth out and hold what I have set.


Improperly set idle mixture screws are often the reason for carburetor symptoms such as hesitation, rough idle, backfire, stalling, hard starting, engine surge, and more. Turned off, then re-started. So that is the prep I already did. Affordable aftermarket fuel injection is here and it couldn't be any easier to install on your vehicle. Rich mixtures: When the air/fuel ratio is less than 14. Our 454ci Lsx is the King of the street when it comes to tire shredding torque!! This engine has a rough idle with a redline of 7000 rpm and loves being run hard on a daily basis making 700hp plus. The stumble off idle was their from the begining. I've got a holley 600 vac secondary on my 355, it's got ported sportsman II's, a hot cam, single plane weiand, and true duals I've got a holley red pump and regulator, set to 5 1/2 psi. The butterfly valve sticks open and the carb will spew gas all over. Discussion in 'Technical' started by scooper77515, Feb 24, 2012. The rockers have been re-adjusted and the carb.


The problem I am having is a small surge at idle (600-700 rpm). 5 AFR on the gauge. Mixture screws let you adjust the mixture of this circuit. The Sniper throttle body, it's a 4 injector unit capable of supporting up to 650 horse power. question is : the idle mix screws are only giving very minor changes in tune, if i screw them right in, there is change in idle but not to the poiint of starving the motor of fuel, so what could be causing the lack of tuning I have an engine problem that has stumped me and I also brought the car to a local "oldtimer" mechanic who also cannot figure out the problem. once you hit the gas to drive it smooths out and drives ok, till i let off the gas to brake and it becomes chopy again. fuel pump, and MSD dist. Holley’s come from the factory with 65 power valves in them. Cam specs are So I know I am starting with a fairly well tuned carb as a reference point. Holley Street HP carb too rich at idle. .


the Holley Sniper EFI, Supports up to 650HP. Put a holley super sniper efi on it and a s475 turbo and didnt bother much with checking the Wastegate springs. it doesn't seem like my engine is about to die each time i'm at idle and rather than the surging it's just a My 300 has some problems at idle. Only at www. It runs fine at high idle, but when the engine warms up the idle becomes similar to an enging running a hot camshaft. You may have to register before you can post: click the register link above to proceed. Runs well at 2000 rpm, rough idle. when i get on it it smoothes out. Re: Intermittent rough idle P0306 code Newer Fords, and by newer I mean anything newer than 1996, do not work well with autolite plugs. Bottom line it runs like crap (to the point of dying) below 1,000 RPM, I'd call it rough between 1,200 and 1,500, and only smooths out at 1,600 and above. Recheck for proper attachment of all vacuum lines and check the lines for cracks.


usually carbs are set up for around a 355 cubic inch motor as far as i can tell. I logged several o2 sensor faults, would start up nice, but transition from idle to WOT was sure rough, (Fighting a lean condition). When the car starts it idles fine at about 1000 RPM. My idle mixture screws are set to the highest vacuum reading at idle, which gives me around a 12. The fast idle cam has a series of steps that will step down (reduce) the idle RPM until the choke plate fully opens. I have the float levels set to the bottom of the sight plug just as they should, but it runs horrible. 028" being sure to blow out any shavings. just replaced the fuel pressure regulator to stop surging at idle and low speeds. Tuning a four-barrel carburetor for the highest performance requires jetting as well as adjustments. At first the car would Idle any where from 1500- 1700 rpm, days later it started sputtering really bad in all of this no CEL changed plugs, now the car barley want to stay runing check fireing order and its right, when i try and start with maf unpluged it runs a tiny bit better so is it a bad maf or some other sensor HELP i miss a week of work already Photo 6: In order to enrichen the idle mixture and to provide the idle mixture screws some range, the orifice would need to be enlarged. Fortunately, it's easy to adjust the idle mixture with a simple screwdriver and a quality Replacement Idle Air Control (IAC) Motor for Sniper EFI TBI Systems, Sniper 90/92/102mm Throttle Bodies, Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950 & Digital Pro-Jection Systems.


Really hoping to actually have everything done Saturday. I know the two things that will slow me down are going to be the fuel supply and return and the timing control part. The 727 does NOT need it with a Holley, but the butterflies are progressive on a Holley so the throttle has to be opened more. It follows a typical path from the float bowl through the main jet, into what is called the idle well, which is a small Idle mixture screws are on the base plate in front. A faulty ignition system is a possible cause of a engine backfire. It is speed density tuned. I have a Slant 6 with single barrel Holley 1945 carb. Sniper EFI is a perfect match for any muscle car, classic truck, street rod, or nearly any other carbureted vehicle. system. 447 lift), 1. There's also a serviceable throttle position sensor and idle air control motor to simplify the installation.


To rough them in, screw each one down until it just seats, then back it out 2 turns. This retains the factory Holley calibration and jetting. Couple days later, it still runs great, just won't idle at all. I'm scratching my head here trying to figure out what I did to my 300. How to cure rough- and/or high-idle issues in your driveway. Holley 4160 running rough after rebuild but I have also read other forum posts online about power valves causing the engine to run very rough off idle and Ok, put a holley double pumper 4160 on my ford 460, it's in a 1986 F-350. It has a 7. My mixture screws on my Holley 4150/4160 do nothing. I think I even have an adaptor for that because a 700R4 needs the same thing when running a Holley. BG PRODUCTS FUEL Cleaner Kit Pour Cf5 & Injection System Carbon Cleaner 210 203 - $17. 5 PSI.


Troubleshooting Your Holley Carb August 2, 2017 Wayne Scraba Fuel Delivery , How-To and Tech Tips , News 1 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 Find Holley Sniper EFI Self-Tuning Fuel Injection Systems 550-511 and get Free Shipping on Orders Over $99 at Summit Racing! Holley Sniper EFI self-tuning fuel injection systems from Holley deliver all the benefits—and none of the hassles. Completely refurbished Holley 700cfm double pumper mechanical secondary carb. When I can get it started it will idle smoothly and it will slowly rev up as high as you want to take it but if you gas it fast it dies and won't start again (after it's warmed up). I am nearly ready to just pull the trigger on the Holley Sniper EFI I just got a 2001 Chevy 5. 99. both are good units, but I just get a better warm and fuzzy with the Holley, even though it runs about $200 more per unit. At first the car would Idle any where from 1500- 1700 rpm, days later it started sputtering really bad in all of this no CEL changed plugs, now the car barley want to stay runing check fireing order and its right, when i try and start with maf unpluged it runs a tiny bit better so is it a bad maf or some other sensor HELP i miss a week of work already idle mix screws holley 600 carby not doing what hey should published by weekendwarrior on Wed, 17/06/2015 - 12:56 . 2 TSP stage 2 LS3 cam, Holley Sniper TB, Reluctor wheel changed from 58 to 24 tooth and IAC unhooked,built 4l80 with Circle D 3200 stall. MoPar did this trick back in the early emissions days. well its running!!! The holley sniper system, all I can say is WOW. Both the crank and the sniper controller are on 15 deg so that is synced, can't get the idle below 850 now.


The carb is a new holley on a 327 chevy sbc. Truck would not accelerate over 10 mph, smoked badly, and felt like the front axle was trying to engage. Maybe this has something to do with not being able to get the idle I replaced all spark plugs (they looked all burnt out) and the wires and that solved the problem with the shuddering and the needle dropping while i'm idling, but my service engine light is still on and my idle is still a little rough. But I wonder if it could have something to do with the TPS going out. In addition to the transmission control, drive by wire, and dual wideband oxygen sensor options, Dominator® systems have nearly unlimited capabilities to control any power adder, input, or output you can throw at them. Carb was a factory overhauled carb (5 years ago) that is a list 1710-45. I unplugged the egr (closed it) and plugged the port on the carb and I'm suddenly at 19 inches now. - Ford 1983 Ranger question I am running a Holley 2bbl Pro-Jection system on my 304. For automatic applications, if the idle vacuum reading is below 12 inches, divide the number in half to determine the correct power valve size. Using good performance long tube header that has 1 7/8” primary tubes and a 3. The Holley marine carburetor can be either a 2 or 4-barrel carburetor, depending on your motor, and will have the same number of idle mixture adjustment screws.


I've gotten great advice so far on this carb but it is still not quite right. Chevy Forums FREE technical assistance for your restoration and repair. My last one was on a Vortec 350 in my son's car, ran great with the Super Victor but when we switched to a Air Gap dual quad setup is ran ok but rough at idle. Jets 86 primary, 88 secondary, Air bleeds: #53 idle, Drilled . Also has the popular ACFI Bright Zinc finish. got it started, was a little rough, but once it stayed on, got out and adjusted the timing slightly til it was smooth idle Now that it was starting each time. I figured its a bit harder since Im trying to daily drive with a This can cause rough idle, hard starting and stalling, and may even damage the catalytic converter. It started immediately and ran good for 30 seconds or so and then began to hunt for idle and run badly. We kept it running and went through the setup process. Try Prime All The Sniper throttle body, it's a 4 injector unit capable of supporting up to 650 horse power. If blown it will allow extra fuel to be drawn into the engine causing rough running and black smoke from extra unburned fuel.


95. Because of this simplicity, troubleshooting will take less time, but the one-barrel will experience the same problems as a two-, three- or four-barrel carburetor. Installed a new holley fuel pump and pressure is between 6. ) bog with giving it slight gas while driving stutters, shutters, wants to die out, occasionally gives a small pop out of carb, I'm guessing this has to do with size of accelerator pump nozzle? right now has . I checked the float level and it's good. It has a built in ECU so there's no external boxes to mount. Since Holleys are so easy to adjust I wasn't able to adjust the idle anymore, I set the timing at 15 deg and the warm idle at 750 rpm, turned off the idle spark control and checked the timing on the crank. With that bad of a back fire if it'still a older holley you could help blown the power valve. Test drove it a few times and shattered 2 pistons on my first 2nd-3rd gear pull. I have a 1965 Ford Galaxie with a Holley 4 barrel carb (#80457-8 I think). it has a comp cam do not know what size.


most 4 barrel carbs have 2 idle air scews the holley im working with has 4 i have used a vacumn gauge but have not been very sucessful this is on a 1969 chevelle ss 396 slightly mod. I have a 1961 292 in my '54 Mercury. This is Holley’s vacuum classification for their opening vacuum. Next set your idle speed where you want it. PART# 543-105 One of the signs of a vehicle with a rough idle is a faulty Idle Air Control (IAC) Motor. Timing is at 10 - 12. 026 IFR on the lower position and a . I have been trying lately to get the AFR dialed in. Is the stock GM Powerglide transmission compatible with this set up? One of the most difficult jobs on a carburetor is getting the proper idle mix. hasn't died yet. I figured its a bit harder since Im trying to daily drive with a The high idle screw and bump cam is on the passenger side of carb, behind the electric choke assembly.


Carb adjustments help needed - Holley 6520, 2. Page 1 of 2 1 2 Next > scooper77515 No current projects. I tried turning in the air/fuel mixture screw but it has no effect. The high RPM is fine, but idle is extremely rough and stalls below 600 RPM. Looking forward to starting to install everything Saturday. I was all the way down to a . Affordable aftermarket fuel injection is here and it couldn’t be any easier to install on your vehicle. My first thought is the valves aren't sealing tightly. PCM 351W running super rich, barely idles, runs rough suddenly. 7:1, lambda also is less than one and the engine has a rich fuel mixture. 02 Silverado with 6.


At the time the IAC will jump all over the place from about 5-28%. Just got my holley sniper efi kit in yesterday. 4 Corner Carb Adjustment _____ Originally Composed by Don At FBO Systems Edited for clarity by some anonymous poser. 3 engine with Holley 5200 carb. It starts and runs fine but after awhile it seems to idle high. I have a 69 Camaro with a 350 V8 which has an Edelbrock 4 bbl. A central point of tech info and knowledge from the Holley team and Sniper EFI users. In that case, Mike increased the size by 7% to . Around 10:1 compression I am having a few fine tuning issues. The others are similar and some of this theory can be applied even if they only have a 2 corner idle system. So I know I am starting with a fairly well tuned carb as a reference point.


5” collector is recommend. I've got a very rough Idle and shaking engine at idle. Both made the same peak HP of 327, but the power was 10 to 15 more HP from idle on up to just below peak. Newer Holly's have a valve that won't blow. Saw over 26psi was sketchy doing burnouts at above 90mph. Holley sniper Idle air control issue badchickenracing1. 6 rockers, Edelbrock RPM, Holley mech. (In is rich, out is lean) Watch your vacuum We the top 10 common EFI mistakes and how to patch them up so you don;t make a costly mistake. Creates an artificial air leak and the throttle plate can cover the idle slot better. I notice when stopped at a light or in traffic. Its smoking black and won't idle or have throttle response.


Mo matter what RPM, it will not stay running in gear and immidiately stalls. On a four-barrel carburetor, there is a primary side and a secondary side. holley sniper rough idle

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