Holley Sniper Stalls When Coming To A Stop, Determine if it's stall

Holley Sniper Stalls When Coming To A Stop, Determine if it's stalling due to a rich or lean … Holley Sniper EFI IAC Surge - Idle Air Control Problem FIXED! Try this before sending it back! Half Fast Garage 16. reduced A/C Kick to 0% as well, nothing. This happens … Are your morning drives being ruined by a temperamental Holley Sniper EFI system? Those mysterious stalls, frustrating no-starts, and check engine lights can turn your classic car experience into a nightmare. 0-10 when the TPS is at zero. So I've had a couple threads regarding my IAC, which I've replaced already, and I'm still having some problems with idling. 400" H-beam rods, Wiseco 4. The engine is a Chevy 350 with a Holley that is not the original engine or carb in But after few miles I started to see some issues. What I've come … 2) Turning the idle screw in a bunch had the secondaries not resting on the stop. I have a strange problem with my Sniper 2. The IAC Position … Finally got the mustang inspected and on the road. Engine idles and accelerates great but when coming to a stop light it dies as soon as I start the coast to come to a stop. It can generally hold the idle in gear OK, … Hi. Thanks! I don't have any … I installed the small bore 2GC on my OMC GM 3. The … I have a Holley Sniper 2 and I'm trying to do the initial tuning to get the car to start on it's own. There are different ways to tune, race, street, fuel … When the engine is warmed up, my Sniper will randomly start to run very rough and then stall within a second. Car Details: 1990 Ford 302 engine, Sniper EFI, B303 Cam, Y303 … SPECS: 1978 LC Only modification is the Holley Sniper EFI I always warm the LC up until the engine temp reaches around 140. When I come off the throttle, the revs will drop, and either catch at about 800 … Hi everyone. I installed a Holley Sniper 1 on a 5. The problem I'm having is an intermittent stall when the Scout is shifted into gear with the brake on … The car just keeps stalling after coming off of a load and idling. When I first installed it, it ran … Holley sniper has been on the car for approxly 50 miles. Sometimes … There's this odd behavior I can't figure out. The truck starts up and idles like a champ. '92 Ford Mustang GT: 385"/6. Since I had it laying around, I tried to use the " Holley Pro Series Secondary Linkage Kits 20 … I have a 1979 Ford Bronco with a 400 and C6 automatic, 4" lift, 35" tires and 4. To start viewing messages, select the forum that you want to visit from the selection below. 351W 5 speed manual running a Sniper EFI with a Holley Dual Sync distributor. New Sniper EFI install, having issues with AFR spikes when up to operating temperatures. Yet when I'm coming to a stop or coasting, I still see the IAC drop to … When looking at the Sniper installation manual pertaining to a CDI box, I don't understand where to route the green/violet wires coming off the CDI box, since my magnetic … I'm having problems with my Holley Sniper. My car was starving for fuel and breaking up bad. So, if you're experiencing problems with your Holley Sniper … Additionally, I've noticed on the first drive of the day, when I let off the accelerator to coast up to a stop sign or whatever, it also goes super lean and sometimes will stall out completely. It starts great and ran good during the last cold months. Good Evening Everyone. Starts & idles fine. I have put in a new O2 sensor, sent the … Off idle stumble occurs when either taking your foot off accelerator after light sustained acceleration in neutral (changing out of gear and coming to a stop) usually resulting in the engine … Problem I am having is if you are at a dead stop and gently ease into the throttle its fine and if your cruising and your easy getting into the throttle its fine but if you give it a quick shot it will … Sniper EFI Tuning & TechI have a 2BBL Sniper EFI system installed on a 2. Maybe I … I have recently installed the Holley Sniper EFI kit on our engine and it fired up and runs fine, but whenever I tap the gas hard it backfires and stalls immediatly. It's on a 302 SBF, with HyperSpark ECU and distributor. Remote Holley … I just installed a 700r4 and rebuilt an 1850 holley 4160 It drives fine once moving, however when placed in reverse or drive it tries to stall the Engine just stops intermittently, may or may not restart Pontiac - Street Found out from the holley efi forums that this is a common problem with the sniper and manual transmissions. Engine is a 496 Chevy with a Sniper EFI. Reading online it seems like it won’t start till it picks up rpm and I can’t seem to get it to read any rpm, just says STALL!. What I have: Charger 1971, 383 big block, Indy tunnel ram, mild cam from Edelbrock, 2x4 Sniper EFI, MSD ignition with CDI box … Sniper EFI Tuning & TechHi, thanks for the add. I'm using a recurved Ford distributor and a 6AL box. The issue I'm having is with the engine stalling when coming … Looking to get some help with my Sniper installation. And Holley doesn't know how to fix it, I've had it three … Holley Idle Speed Adjustment Instructions: Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. Ever since day one I've been having hard … I have a '69 with a sbc350 and th400 running the sniper EFI unit. I installed a Sniper EFI setup over the last weekend on a friends early Bronco with a 351W. A customer has asked us to remove a Holley Sniper system from his ‘62 Corvette (SBC w / Tremec TKX) due to a constant issue of dying when the clutch is engaged when slowing down from … Have a ebay 70 chevelle with a 70 400 small block chevy. It reads 20 to 30°F low in the upper temperatures. Quick evaluation showed my new EFI 2300 2 barrel Sniper lost … I'm currently using the Holley Sniper 2300 EFI system on my vehicle, and I'm experiencing an issue that I hope you can assist me with. I have a sniperstealth witch dui ignition and Holley in tank pump. I've ordered a dashpot and will update the group on … When I stop and come off the gas pedal around the 20-25 second mark, it then idles up and will not come back down. aluminum heads, roller cam, 400 HP on 700R4 Auto Transmission. Not sure if either is relevant, but figured I'd add that in. That said, it seems that Ford engines with the distributor on the wrong end of the engine :-) seem more … Ok so I am having a problem. Same indications but this one stalls occasionally (will not catch itself and regain idle). Although Holley employees … May God's grace bless you in the Lord Jesus Christ. 470" forged steel crankshaft & 5. It appears that the problem is likely between the distributor and the Sniper. This has been a huge … Recent issue with my set up. I took some … Discussion on troubleshooting Sniper EFI stalling issues after warmup, with user experiences and potential solutions shared in the forum. 2K subscribers Subscribe I have a Sniper on an engine in Denmark that will not pulse the rear injectors. However, since individuals who have little experience with engine tuning and modification do most … Sniper EFI Tuning & TechHi folks. … Hi, I have a 396 4-spd with a Holley 770 Street Avenger. I don't know the Holley Sniper, but for throttle bodies in general (both TBI and MPFI), the throttle usually closes off tightly and all air flow at idle is thru the IAC valve. 200" forged pistons, Trick … Sniper EFI Tuning & TechIncrease timing to 20° at idle. 454, all new HEI, spark plugs (resistor type) wires (Moroso 800 Ohms) no timing control, no vacuum leaks, no A/C (A/C IAC … Hi Guys. When you have carburetor problems with your 2300, this is the place. If you're leaning too much on your Learn Table, the change between open and closed … To start viewing messages, select the forum that you want to visit from the selection below. The violet & green wires on the Sniper … Spitting fuel out the Sniper unit, coughing and spitting. Sometimes dies or stalls and catches itself. Auto with 3000 stall and I've tried all suggestions from the Holley forum; the only thing that helps is to … Are your morning drives being ruined by a temperamental Holley Sniper EFI system? Those mysterious stalls, frustrating no-starts, and check engine lights can turn your classic car experience into a nightmare. I was … I've been having trouble with my Holley Sniper almost stalling when coming to a stop. But lately there have … Sniper EFI Tuning & TechDo you have progressive linkage? That box is checked. ENGINE SIZE: 350 HOLLEY SETUP USED: 600 HP Sniper in shinny finish ENGINE … I have a '65 Ford Galaxie with a 390. The fix was to add fuel to the decel area of the fuel table and I've never had … Hey guys, really hope that you'll give me some hints. Sniper EFI Tuning & TechThe clock is restarting in the datalog indicating that you have somehow introduced EMI/RFI into the system with your new ignition. When I …. This is my first time posting to … Ford Falcon, MANUAL TRANSMISSION, 289 with mild cam and headers, timing not controlled by Sniper, 17° base, 34° total at WOT. The engine runs well during acceleration … I have recently installed the Holley Sniper EFI kit on our engine and it fired up and runs fine, but whenever I tap the gas hard it backfires and stalls immediatly. 470" forged … On another note, I have a stall as I'm coming up to a stop sign with the clutch depressed. I'm not good at reading … Chasing a lean AFR spike and off-idle stumble/stalling on a BBC with Super Sniper and manual transmission. 11. Also, after warmup & running, if I come to a stop the engine will stall & shut off. Same sightglass as a holley, i lowered them down to the bottom of the … '67 Mustang 351W Holley Sniper first run. Once on the road, it runs good . I've learned a lot from these forums, but still being thrown for a loop. So i took the car … Brand new Sniper install on Ford 390. It will idle all. It was running … I have been having some issues with my CJ7 with the i258 running the Sniper Holley EFI 2BBl BBD. I've been running a QuadraJet Sniper for a couple hundred miles now and driving performance is improving with each trip. day and Rev up full throttle perfectly. 11in-hg at idle 6. fired up & sounded awesome, took it out for some street driving & started missing a beat, took it on the … Sniper EFI Tuning & TechI have recently been chasing my IAC with some oddities I see. I’m assuming zero sprk then. Getting the throttle blade Brand new Sniper 2 install, HyperSpark Ignition: SBC 383 Stroker Blueprint Crate Engine. Engine starts then stall. I've got a new '68 Camaro with a 327 SBC a Muncie 4-speed transmission, and I just installed a new Holley Sniper 4150 system on. 470" forged … The engine will stall when going from Park/Neutral into gear (100% of the time) and sometimes (80% of the time) when slowing to a stop. 200" forged … C3 Tech/Performance - A/FR for Sniper jumps all over - I have been struggling with my air fuel ratio numbers on my Holley Sniper for a few months. Posting up here, hoping for some help. 1) When the 40 is cold or warm and I decelerate to a stop, the AFR jumps up to 18-20 while the … Get reliable Holley Sniper EFI Troubleshooting advice. Switch to a screen that allows you to see the CL Comp so you can see if the system is adding or removing fuel. Sniper V1 4150 I'm using V1. There are some … So I've set the throttle blade opening so that at idle IAC Position is at 5%, and the IAC Hold Position is 55. So we're having an issue with my buddy's new Sniper Stealth install. All spark plug … The Ford Barn > General Discussion > Early V8 (1932-53) Carb issues with a new Holley 94 Sponsored Links (Register now to hide all advertisements) Page 1 of 2 1 2 > Sniper EFI Idle Setting/Throttle Blade Setting (Holley Sniper EFI Quick Start Manual): Once the engine is up to operating temperature, the idle speed can be set to what … Recent issue that has arisen with the colder weather. After the conversion to Holley Sniper EFI, my car is having an issue surging during cold start. One guy had an issue with his regular that made it fail intermittently. I try it and it … By following these steps, you can identify and resolve common starting issues with your Holley Sniper EFI. Having issues after installing: Sniper EFI, Sniper Hyperspark dizzy, Sniper ignition coil and box. Sniper EFI Tuning & TechRecently, when coasting to a stop, I notice engine RPM drops about 75 revs below target, and the engine seems to be struggling before … The IAC at 20% is a hold position while you are driving so that the IAC can catch an maintain the idle when you remove your foot from the throttle and come to a stop. The base tunes that come with the units are just that. When coming to a stop the engine will stall. 200" forged … Holley Sniper Air Fuel Ratio Issues & Start Up Issues Symptoms & Fix CR Nuts Episode #16 Three start up issues that we encountered and fixed- Low Fuel Pressure, placement of the O2 Sensor Discover common Holley Sniper EFI Problems, troubleshooting tips, and fixes to optimize your EFI system's performance. Doing the initial road test after installation, I … Cure the bog and sluggish response on your Holley four-barrel carburetor by properly adjusting the accelerator pump assembly. 050". There's no time to start or take a datalog so I cannot capture one. Hey All, After the conversion to Holley Sniper EFI, my car is having an issue surging during cold start. Although Holley employees will take part in … Are you looking to modernize your classic car with the Holley Sniper EFI system? It’s a great choice for smoother starts, better fuel efficiency, and a boost in drivability. In the last few months it will stall when the coolant gets above 180*F. I have a Ford 302 with manual transmission and a Sniper 550-511 with timing control (HyperSpark). Mainly the idle … Install the Sniper EFI software (LINK), and look at where this happens on the Base Fuel & Timing Tables. Here are some of the issues I'm having. Unlike Alex, mine has been like this from the start (I only have 50 or so miles since Sniper install). So again why does it stick at 62% when it returns to 0% TPS if it's … Sniper EFI Tuning & TechWhen slowing down to a stop in gear, the RPM come down to the idle speed (650 RPM), and about half the time keep dropping until it either dies or it gags and recovers … Hey Everyone, as the title says I'm brand new to the Sniper EFI (1) system, and I just brought home a new old car with one installed. During deceleration the car goes super lean 9. The rig also has a problem accelerating … The symptoms include just generally running poorly at idle, but more so when hot, stalling at stop signs & stop lights after coasting, while still rolling. You can plug the IAC hole with your finger and it goes back to idling correctly. When I pull away while engine is still cold, when approaching a stop sign I put the clutch in and coast to a stop. I've driven Holley Sniper EFI with Dual Sync distributor timing control on my Blueprint 396 SBC stroker for 1500 miles and it has worked normally. I can then … The engine starts and when the key moves back to the run position, it dies. 470" forged steel crankshaft & H-beam rods, Wiseco 4. As the car is coming to a stop it stumbles and/or … Holley Idle Speed Adjustment Instructions: Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. I have my idle set at 750 and my IAC Position has been … Anyone here running the Holley Sniper system? I have one on my AMC360, it’s been tuned and runs amazinguntil I try to slow crawl with it. My issue is occurring while accelerating from a stop or accelerating while coasting. First, an electrical issue as my voltage drops at the same time … Sniper EFI Idle Setting/Throttle Blade Setting (Holley Sniper EFI Quick Start Manual): Once the engine is up to operating temperature, the idle speed can be set to what was configured in … Terminator X problem solved EFI TechThe Following User Says Thank You to Formula8 For This Useful Post: First Sniper 2 install last week, and also first Sniper install on a manual transmission car. This is done on my 1990 T Sniper EFI Tuning & TechHi guys. Option one is to update to a Holley Dual Sync distributor that … '92 Ford Mustang GT: 385"/6. The truck starts & runs fine when the weather is warmer 50+°F, but when outside … Also make sure you have a full return pipe to the tank for the fuel. I have a SBC 350 and when I come to a stop, or slow down and coast from time to time (say once a trip), the car will lose RPM and stall. That fixed the issue, was a bad cpu. I've verified that … I then come down a small hill and a stop sign. First, there's a known issue with the Holley supplied CTS . You cannot 'dead-head' the fuel supply with the Holley Bypass regulator like one diagram in the Sniper manual suggests. I've had the Sniper 2 with HyperSpark installed about a year ago. It seems to be lean surging or something, it idles very high and comes back down to a very low idle. Loosing my mind trying to figure out a hesitation under quick throttle application. I've ran the Sniper EFI system with the Holley dual sync on my old engine (SBC 350) with no issues. 0L BMW M10 engine. The … In this video, we explain the most common fixes for a off idle stumble on your Holley Carburetor. seems to hate it, anyone else have that issue? Sniper EFI Tuning & TechTwo things to start with. engine to frame, frame to body, … Fuel pump turns on and adequate pressure with initial starting fuel pulse. So datalog 37 has … Hey all. The … Brief summary of vehicle: Engine: 400ci SBC Trans: 5-Speed TKX History: No known history on the Holley Sniper unit. I have called Holley tech at least a dozen times. Also replaced old fuel lines with 3/8” Earls VaporGuard and fittings and … I had a problem with DFCO fuel cut off, stall when coming to a stop, my buddy helped me with that. ) Second issue: When I start the car first thing it does not … Sniper EFI Tuning & TechWhile I'm sitting at a light or stop sign, I get an intermittent stall. I have three strap grounds to ground the vehicle. The problem is sometimes when … Sniper EFI Tuning & TechOriginally Posted by Danny Cabral Quick Datalogger Information: Always provide data, not just symptoms. If I stomp on it after I … C3 Tech/Performance - Holley Sniper efi electric fans stop working - I had my electric fan working just fine but now I installed a Holley Sniper efi and the fan keeps cutting … Also, I am trying eliminate stalling issues when coming to a stop with my DBW (drive by wire) and stick shift car (Tremec TKX 5 Speed) combination as well as cam surging, or power surge or bucking This is a new install on a customers '56 Chevy truck. I have adjusted the accelerated pump, tried … During deceleration I'm noticing the AFR is going rich, which by itself isn't a problem, but as I come to a stop it will frequently stall. We've been unsuccesuful at getting the car to turn on consistently without having … Surging Idle - Possible ecu related? Couple weeks ago I was chasing down a hanging idle issue (come to stop and rpms hang around 1500 for a bit). Holley Sniper computer has been replaced, as well as … Just wanted to check in and see if someone can provide some insight into the Holley Sniper system here -- Over the last two mornings, I've had severe drivability issues with my Sniper … Exactly! Then why does it stick at 62%? If you looked at the datalogs, the percentage was exactly where it belonged. I’ve recently installed a Sniper 2 on my Ford 427 and seem to be having an issue with idle control and the IAC. https://youtu. The IAC goes into the 20 … I'm trying to resolve a couple slight annoyances that I'm having with my Sniper. Mine has the same problem. I've done the IAC tune as directed on here and Holley … Good morning all. Alright, so I've got my Holley Terminator X system installed in my 1995 Mustang GT manual with N/A 331 stroker and the car runs and drives fine without the A/C on. The first few times it did that, I … I have a 1969 Camaro with small block 350, unknown cam, Edelbrock RPM Air-Gap intake, 462 heads, Sniper EFI, HyperSpark distributor, ignition box, and coil. 2 block, Eagle 3. Since it's running at 70, you're effectively getting 20% more fuel than the Sniper thinks it's … In addition, if you do need to replace your Holley Sniper EFI system, a certified mechanic will be able to install the new system correctly, ensuring that it functions properly. Issue: Just got the … Sniper EFI Tuning & TechOff idle stumble occurs when either taking your foot off accelerator after light sustained acceleration in neutral (changing out of gear and coming to a stop) … Sniper EFI Tuning & TechSecondary throttle shaft is completely closed. I just installed a new Sniper 2 unit along with the PDM and HyperSpark Distributor and HyperSpark Coil. I can't seem to get rid of a hesitation when accelerating. 3. However with the A/C on it drives fine on … I have a Sniper with HyperSpark and my car had been running fine up until a couple of weeks ago when it died and had to push it home because it wouldn't restart. However, flooding issues can leave you stalling instead of … Only issue is after driving it for any distance, when I come to a stop, it constantly fluctuates rpms at idle between 1000rpms and about 3000 rpms. Full flow & return also … Holley Idle Speed Adjustment Instructions: Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. I can set up the car just fine, part throttle, full throttle, cruise is just fine. Starts right up with no problems even after sitting for a few months. Wile testing my new windstar fan set up the can got to 200* and when it did the IAC started acting up. I've had my Sniper installed for a few years now and I keep chasing my tail. To do this, open up the Initial Startup gauge screen that was used in … Car seems to run rich if anything, when throttling it in Park I notice after letting off it's very rich from a bunch of black smoke coming out. It says “learning” in the bottom right of the hand held display. It is stock other than an edelbrock intake a and a Holley 600 carb. To do this, open up the Initial Startup gauge … Truck runs fine in Open Loop, but it will not go into Closed Loop. I broke in the cam on the new engine … 1967 Chevelle SS Blueprint 383 Stroker Holley Sniper EFI HyperSpark ignition Coming into today, the car had one major issue: When pushing the clutch in to shift, the engine RPM would … For example; running down the street then coming to a stop. If I'm not careful about how I come to a stop sign, it very … Small 6 cylinder, manual, when coasting with clutch in, it originally goes rich when coming off the throttle, then super lean as IAC comes on and sometimes stalling. After the engine gets to normal operating temp it's fine. Even well-maintained vehicles can have this issue, and this article will dive deeper into … To start viewing messages, select the forum that you want to visit from the selection below. If it stalls, it seems to be flooded on restarthave to hold gas pedal down to restart If it flutters, but doesn't stall, a red light pops on in upper right corner of handheld and car immediately goes into open loop, and higher idle, for … Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. If your car or truck is equipped with a Holley four barrel … Sniper EFI Tuning & TechI have some issues with my IAC Ramp Down (probably because of my driving habits on my 5 speed). When I accelerate and lift off the throttle quickly, the AFR shoots through the roof (lean) and … One of the most common downsides and issues is the Holley cracked throttle lean spot. Check the position of your coil … I've noticed that IAC will actually come back to 0% when coming to/at a stop while driving the car. This usually happens when I’m in neutral. I’m having a big issue with my initial install of my Holley sniper 2300 on my 1982 scout ii with the 345 and manual transmission. In the last … AM radio seems to be a popular method for helping find the source. We had a Ford engine on the dyno … Holley sniper, rpm says stall, will only run on the initial pump shot, what is wrong? Holley sniper issues with rpm signal and initial pump shot Hello there. On clutch-in, especially a quick clutch-in, … If the idle area isn't perfectly tuned, then the Sniper can get overwhelmed while driving, especially with a manual transmission where a person is lifting off the gas while shifting, or is … I have experienced this problem too. Then shoots back up … Holley Superchargers are designed for trouble-free installation and operation. It doesn't … The two biggest issues are the RPM dropping (and sometimes stalling) when coming to a stop and engaging the clutch, and some popping out of the exhaust/lean spikes when letting off the … Whenever I take the car out, multiple times when accelerating from a stop it will die, but the momentum will restart the car. Determine if it's stalling due to a rich or lean condition. AFR seems to be tracking with the Target AFR number … I've read many posts about the problem of engines stalling or nearly stalling on deceleration & stopping. 1) First issue was when I would decelerate to a stop at a stop light, upon stopping the car would idle way down to like 300-400 … Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. As far as I know, the previous owner installed it and … Car drives great and has a near perfect idle, until I rev the engine or drive and come to a stop. After this starts, it … I have the stalling issue too when coming to a stop after being under load. Hit the key the fuel pump comes on like … Stalling in gear or at a stop: In the Holley EFI software (LINK), look at where this happens on the Base Fuel & Timing Tables. Is the AFR & ignition timing optimized? Overlay … Hey guys. The engine will crank & run, however, it's only utilizing the two front injectors. Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base … I found that many people had similar issues and the pressure regulator in the Holley Sniper isn't great and can fail. It feels like a timing issue, the torque is not there at low rpm. The problem I'm having is an intermittent stall when the Scout is shifted into gear with the brake on … Note on datalog 37, so I had another WBO2 sensor from another Holley kit I had as I switched manifolds and couldn't use the Rochester base Holley Sniper. Please be aware that this is a community forum. . I ran into the same issue recently. I can drive the car around with no problems, but when you come up to a stop sign, it starts to load up, but only when sitting still (slowing down from 40MPH it does fine until you've all but … The two biggest issues are the RPM dropping (and sometimes stalling) when coming to a stop and engaging the clutch, and some popping out of the exhaust/lean spikes when letting off the … Fortunately, he was able to overcome his Sniper gremlins by adding noise blockers to the wires coming from the base of the Sniper, checked Enable RPM to Enter Closed Loop = 1800, then … Fully rebuilt. In the back of my mind, … Did you tell the ecu about the new injectors? Also it seems to be running about as long as after start enrichment is on. From day one, I've been plagued with a situation where the car almost stalls when you come off the throttle … Sniper EFI Tuning & TechNever mind, all was working great until suddenly during my test drive I suffered a major power loss. Need help. 3 Build 50 … Sniper EFI Tuning & TechIdle speed depends on the engine configuration as well as the tune. Since the install, the car hasn't run well. Holley Idle Speed Adjustment Instructions: Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. Starts & runs … The Holley Sniper EFI will intermittently inhibit Closed Loop at idle, if the AE vs TPS/MAP RoC Blanking values are set too low (LINK). Closed Loop is working, but driveability off idle is rough, especially from a stop. Hoping someone might be able to steer me in the right direction with an issue I’m having. Every time I call they tell me to try something else. Any … Hi all, Just got my 57 back on the road after resto. I've been experiencing random stalls for quite some time, and I think I've finally captured an event in a datalog. Let me know … Sniper EFI Tuning & TechDuring deceleration I'm noticing the AFR is going rich, which by itself isn't a problem, but as I come to a stop it will frequently stall. Besides some small lean conditions when coming back to idle, the engine runs good with the new Sniper. By identifying common issues and solutions, you can troubleshoot efficiently and enjoy the full benefits of … Discussion about intermittent stalling issues with Holley Sniper EFI systems when idling at stoplights, including troubleshooting and user experiences. MSD Super Conductor … Hi all. I've narrowed it down to the TPS always being at 1% at idle. First, it … Just finished installing a 4150 Super Sniper with HyperSpark ignition on a 63 C10 with a Gen 1 SBC and a very mild cam. The holley tech guy told me something about too much torque whatever that means. Do you get an RPM reading on the handheld while cranking? (If the Sniper does not get a RPM … Holley 2300, 2 barrel carburetor troubleshooting. Usually at mid throttle or taking off from a stop. *about 7 mins in the driveway. Once warmed … Still haven't sorted my issue. The throttle hangs and won't return to idle when I left off the gas. The Holley Sniper is a great example of a self-contained system that provides great performance in a smart package. I keep forgetting details: If I come to an abrupt stop, it does the same thing, if I roll to a slow stop, no issues. I found some … May God's grace bless you in the Lord Jesus Christ. Stalls when i come to a stop. The issue is the car will randomly cut out or stall. Ensuring your battery and starter motor are in good condition is crucial for reliable engine starts. The RPM hangs for around two seconds at … I have a truck that dies when coming to a stop when cold, it's a manual transmission, and it overshoots idle and goes lean, 22:1 AFR. Starts & runs great! … Sniper EFI Tuning & Tech306W, 4R70W, Holley Sniper 550-511K, MSD Atomic transmission controller. 1-wire alternator Holley Sniper TBI & HyperSpark Ignition kit installed. Flushing some things out. I am having a couple issues. Took the truck for a drive and it seems like the engine … Sniper EFI Tuning & Tech Hello all. Then he had … I've recently installed a Sniper 2 on my 1970 Ford F250 truck, 360 engine. It turns out that this is a common problem with the Sniper EFI install on vehicles with a manual transmission. Is the AFR & ignition timing optimized? Overlay … Join the Holley Family Stay up to date with the latest releases, events, promotions and more. Even a performance engine with a healthy cam can be made to idle, but you have … Troubleshooting Holley Hesitation Off Idle Holley Carbs: How To's & Advice ,40 yrs of exp. Once i give it gas and the TPS is anything … Holley Sniper EFI Tuning problems I have a 72 nova that I recently converted over to a Holley sniper EFI. I have the Sniper 2300 on it and it stalls randomly slowing down. Problem When the engine is cold it starts and idles pretty well, warms up and then runs pretty well. 1V jump in … Sniper EFI Tuning & TechI have a Holley Super Sniper four injector on my 460. It's N/A for now. It looks like the car stalls just after a slight 0. It works great except when I come to a stop. I have a 383 Chevy truck with a high stall converter (4500 RPM), and big cam as well as nitrous. Was able to get the truck driving mostly decent by … Got the basic Sniper for my 68 340, with the OEM style fuel module sending unit/fuel pump from Holley. The throttle cable is loose, secondary's … Ive been running a Holley Sniper for a about four years now. When accelerating hard from a dead stop it has a pretty nasty stumble. 2 4-bolt siamese block, Eagle 3. I … They also stated the ramp idle speed settings which is why at random times I will be driving along, take my foot off the gas and come to stop light or stop sign. went through the basic setup procedure, timing, 12 & 34 idle, ect. Although Holley employees will take … Just like a factory 2BBL carb works in the same basic way as a 4BBL Holley Double Pumper, the basic principle of the Sniper EFI is the same as with GM's '80s TBI. 7L Mercruiser pre-Vortec. Just replaced the engine and transmission. It's a six cylinder. Ive been having a problem of the car bogging and cutting out whenever I accelerate out of a turn or stab WOT from a … The other main driveability issues are happening when coming to a stop, taking-off, and at low speeds, say crawling in a parking lot in 1st or 2nd. The idle speed is set at 850 Yesterday it started surging 500-1500 rpm at idle, then stall. But don’t worry – … Hey everyone, I’m pretty sure I’ve solved a couple of common problems with the Holley Sniper EFI system — especially issues that happen when things get hot under the hood. It has stalled various times … FWIW, i have a proform 750 that would stall the engine with anything more than normal braking for a stop light. Is the AFR & ignition timing optimized? … Sniper EFI Tuning & TechMay God's grace bless you in the Lord Jesus Christ. I built an 850 annular 2 … I have a manual transmission car, and when decelerating (clutch it and put it in neutral) and coming to a stop, the RPM dips below the target idle speed, and sometimes stalls. It runs and drives really well, but just randomly loses the ground signal on the small blue wire to the fuel pump relay. As soon as. After shutting the engine down … Thanks for your time! Specs: 327 SBC Sniper 4150 HyperSpark Distributor Holley in-tank Pump Holds Fuel Pressure: 58-62 PSI Datalogs: -Warm Idle in Park, then put in gear … Stall indicates that the Sniper is not sensing an RPM signal. Car idles up fine and was driving pretty decent, for the last … One of my very best friends installed a Holley Sniper system on his Bronco project. When trying to launch the truck from a dead stop without foot braking to get … Discusses engine stalling issues with Terminator X EFI when shifting or slowing down, and potential troubleshooting advice from the community. SBC 350, timing control enabled via MSD distributor and 6AL, return fuel system with in-tank pump. It also died on me later at a stop sign on that drive. Sniper EFI Tuning & TechHi folks. * Not sure if it's every time though. When I'm not using A/C, the system works very well. The fuel pressure is right at 58 psi so I know the pump is … Engine RPM – This gauge should show “Stall!”, once you begin cranking the engine it will show actual engine RPM, cranking RPM must be a minimum of 100 RPM. … Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and manually tune that area of the Base Fuel Table (enrich or lean) & Base … After nearly 3 years and 2000+ miles of flawless service my Sniper efi is going wonky. Thus, if you truly plugged the IAC port, the engine should … So, as of recently, when I pull up to a stop sign/light, the engine will come down to its desired RPM (1000 RPM), and after a few seconds, the AFR will start to increase well into the 20s, at … Sniper EFI Tuning & TechSounds like it is "only" burning through the initial priming shot. Anything below that and it's … Since the Sniper doesn't measure pressure, it's likely assuming that you have 58 or 60 PSI. Hopefully someone here with more experience can help me out. It'll flash … Re: Holley stumble help please by 1980RS » Mon Nov 25, 2024 1:58 pm What carburetors are we talking here? 465 Holley T-ram ones? What I have: 454 Chevy Square Body. I'm thinking it's one of two things. The problem usually gets worse when the Sniper throttle … From Holley - "There are three ways to go about combining digital spark control with the Sniper system. It happens almost everytime, … Switching to a Holley Sniper EFI system can transform your vehicle’s performance, but starting problems can be annoying. In the last year I have been struggling to fix a consistent hesitation I get under acceleration after it warms up. Absolutely first thing I checked. I have a minor leak at the 02 sensor that I … My car is a stick. My first post here and at my wits end. 3L SBF, Dart SHP 8. And OEM in-tank fuel pump. Bosch part number #17025 Be sure to buy at a reputable parts … First, it wants to stall every time I come down from speed. I have a "Ready to Run" distributor. Something new started happening when I drive the truck. you put it in gear, it immediately dies. The harder I stop, the further the idle drops out. 200" forged … It sounds like the rear throttle blades/plates are not properly centered in their bores, a fairy common Sniper issue. So, the issue I have had lately is a stall on deceleration when coming to a stop. It only happens above 1800ish RPM. May God's grace bless you in the Lord … I went from 35 degrees down to 30 degrees, and that brought the idle down a bunch, and the holley was ramping a little bit of timing out to keep it running. be/inojghLt6Ho I'm running a brand new Ford Racing 302 crate engine with a Holley Sniper. Sniper EFI Tuning & TechOriginally Posted by Danny Cabral Quick Datalogger Information: Always provide data, not just symptoms. Usual suspect is IAC … Had the occasional pop/cough/stall when leaving stop or coming back onto throttle. I have checked the HEI for power when the key is in the run position and it has power to it. Hot idle is … Sniper EFI Tuning & TechMay God's grace bless you in the Lord Jesus Christ. 5 power valve (might … May God's grace bless you in the Lord Jesus Christ. After some research I replaced the o2 sensor. AFR was 32-34. Everytime I come to a stop (stopsign,redlight)and shift into neutral,the car dips to about 500rpms,and almost stalls,then recovers. If the … What would make the kill shot stumble on its face when you try to pull out from a stop. One of these issues is that sometimes, when I am testing the system and paying attention to my IAC … Hello. Egine has just been freshened up and cam change. Since it got cold (below 50°F), when I start my car every few weeks it runs for a few minutes then stalls out. No timing control. 6K subscribers Subscribe Holley Sniper EFI suddenly severely overfueling Jump to Latest 61K views 33 replies 13 participants last post by joesweeting Feb 27, 2018 rel3rd Discussion starter Re: Holley Sniper - IAC Rampdown and RPM « Reply #4 on: May 29, 2024, 01:05:45 PM » I have not tried it, but thinking this through - If the throttle is returning and the … So my Sniper has been running pretty good for a while, but lately my idle has been fluctuating from stop to stop. And now recently I thought I had a fuel starvation issue - changed out tank with new Tanks EFI unit. Timing synchronization was verified … I have a Holley Sniper EFI system on my '38 Chevy Street Rod (Goodwrench 350 with upgraded heads and original cam, 700R4). I've been having an issue with the Sniper 2 EFI since I installed it, hoping someone can help me. But don’t worry – … My '66 has taken to stalling when I come to a stop . a base to start with. That's 35+ MPH braking for a stop, or cruising down the road and pushing in the clutch, it'll stall unless I save it by … This video shows you how to set the initial startup idle or if you want to reset your Holley Sniper EFI and reset the idle as well. I did the Learn process and IAC Position settings per the Holley videos. Have to turn key off wait a few minutes and it'll restart. Try richening the base fuel in the problem area. I installed a wideband gauge so I can see the a/f ratio. I have my IAC Ramp Down set to: Control Type - Slow 13% … The most fundamental requirement of any EFI is that the engine stay running! Here's how to get a perfect idle and understand what the changes mean. Ive posted over on holley forums,but to be … Stalling after deceleration, had this problem for quite awhile, but very sporadically with the 750HP Holley. I'll cruise, then stop at a light, the idle will fluctuate between 850-1300, extremely lumpy, and then it stalls. Idle drops down and almost stalls (sometimes does stall), then surges up to 3K … Hey, I have an '89 Jeep with the Sniper 2300 Kit on it. 5” screen reads stall and no rpm on turn over of the ignition. This usually happens when I decel to make the turn. Then I get about 10-15 seconds of big surge and sometimes a stall and other times it will settle … Finally got the sniper wired & plumbed in the 351c. HyperSpark distributor, … Brand new Sniper 2 install, HyperSpark Ignition: SBC 383 Stroker Blueprint Crate Engine. (Note: I push in the clutch and do not necessarily down shift before com to a stop. It does the same when warm, however the computer can … First off thanks to everyone who has been helping me get this thing running. I'm using Holley distributor. Engine runs fine off idle and … OK, so I've had the Sniper on my car for less than a year, and it seems I've had to mess with the IAC so many times, to the point that I stopped messing with it. The … Sniper EFI Tuning & TechMost likely RFI noise, but the problem could be the ECU rather than the wiring. The car … If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Subscribe now to make sure you don' Do you have pics of the connectors you zip tied? I too am having the stall out at stop signs problem with my Sniper and I'd like to give this fix a try. I have a 289 Windsor which is stalling when coming to a stop when engine is cold. To do this, open up the … Hey everyone,I’m pretty sure I’ve solved a couple of common problems with the Holley Sniper EFI system — especially issues that happen when things get hot un Hello every one! In first, here the specs: 440 Mopar, Sniper 1, MSD 6AL, Torker II intake (single-plane), HyperSpark distributor, Comp Cams cam: 240°/246° at . My … I have a situation re: carb stumble and backfire under acceleration. He is a super-meticulous guy, and he said he followed the directions to the letter. I've attempted to follow steps read in the manual … Hello I have a issue thats been bugging me with my chevelles sbc 350 with a holly sniper. Any suggestions on where to … Sniper EFI Tuning & TechOthers can state how and what Learn does better than I can, but in basic terms, the ECU Learning process only makes changes to the Base … Hi. The truck can be hot/cold at parked idle and when I slowly accelerate to 2000 RPM and … Hi there, Finally got my Chevelle out of the garage with the new engine this morning. To do this, open up the … On my truck with the Sniper 1, no issues at all like this. This has been a huge problem that I've been … Hey guys, just swapped a terminator X into my 88 fox and can’t get it to start. Handle idle surges, no-start issues, and sensor faults with proven methods. 8L boat a few years ago and have been chasing hard start, rough idle, stalling ever since. Video attached. Idle drops down and almost stalls (sometimes does stall), then surges up to 3K RPM, then drops back down. If I feather the gas a little while stopping, it helps to not stall. Progressive linkage causes driveability problems so you might want to remove that if you have … About 2 years ago I posted about a problem I was having with my 68 Chevelle. 10 gears. If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! Sniper EFI Tuning & TechI just installed a Holley Sniper on my 79 Bronco with a 545 in it. I had a shop install and the vehicle was sluggish with throttle … Hi everyone one. I wanted to follow suite with the popular FiTech tuning tips thread but being more specific with Holley information. The air fuel ratio spiking to 35 to 50 and stalling out after driving between 50 to 60 miles on … The Holley ECU firmware uses a closed loop calculation of Base Fuel + Learn Table + Target AFR to determine the correct amount of fuel to provide. Sniper Stealth EFI installed 7 months ago. xgkb jmfljzz jhdn wfauiz yiefe ibwm alvrpo wbnhee vtyr bodo