Holley Sniper Rough Idle, I currently have the Sniper set to stay in Open Loop below 1200 RPM. Hello. Basically, cold I have it at 1400 and by 165°F it's set to 800. Out of the blue it started idling rough and gutless. I have a … Car goes dead lean off idle to WOT, Holley Super Sniper 8 injector. (Remember to cycle the ignition switch to recalibrate the idle you've set … Sniper EFI Tuning &amp; TechThere's a difference between cleaning injectors for maintenance and cleaning them to diagnose a problem. The broad consensus has been that the Sniper is an … Not a Sniper expert but I do have a Sniper on a non BPE 347. So you installed your Holley Sniper. The car already … Just finished installing a 4150 Super Sniper with HyperSpark ignition on a 63 C10 with a Gen 1 SBC and a very mild cam. It develops a staggering 161 HP and 296 pound feet of torque. Quick evaluation showed my new EFI 2300 2 barrel Sniper lost … 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 … Yes, ensure the idle speed screw/IAC Position % relationship is properly adjusted at hot idle. Tried messing with throttle blade settings, IAC speed and Open/Closed Loop. 5 V8. 5 or a little leaner. Mainly the idle will not stay level. Built 350 SBC - aluminum heads. I've got a locked out distributor hooked up, feeding an MSD Digital 6 Plus CDI box, … So far good. In this case, I can't get the engine to idle when cold. Anything below that and it's … 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. After some research I replaced the o2 sensor. Hi All. 2 block, Eagle forged steel crankshaft & H-beam rods, … The "OK Idle" means it idles like an engine with a performance cam, which it has and it's an odd fire engine, both known for rough idle. 3) The Sniper Stealth does not support and cannot be run with a … Sniper EFI Tuning & TechI don't see a problem in the datalog. Learn the common causes of rough idle in Holley 4150 and 4160 carburetors. I'm also wondering if … Not IAC, but Idle Spark control usually works well at: 30-40 P Term & 50-60 D Term. I figured I would reach out here to this forum for ideas while waiting more feedback from Holley Tech Support. I noticed the AFR was stuck on 15, but … Hi friends. Just replaced the engine and transmission. Then he had a miserable … Good Evening Everyone. Just joined. Knowing these common problems and their causes can help you … 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 recently had an exhaust header gasket leaking which was messing with my drivability. I set timing to 18* where is normally … Sniper EFI Tuning & TechForum Holley EFI Sniper EFI If this is your first visit, be sure to check out the FAQ by clicking the link above. I think it's like 8:1 compression. Although Holley employees will take part in … Why would you disable ECU timing control with the Holley Dual Sync Distributor? The fluctuating timing at idle is the Idle Spark control doing its job to stabilize the idle speed. I don't know what's changing the MAP reading suddenly. 5° currently commanded. I talked to a Holley engineer about this a couple of years ago when I was trying to figure out how to push a Sniper past 650 HP and he … Holley EFI Troubleshooting: A 3% Error Caused THIS! Want to Learn How To TUNE Holley Efi, Terminator X, and Sniper? more The problem I'm having is on cold startup, it's very rough even dying occasionally. Just for a test, set your target idle speed to 800, adjust the idle screw, and see if it runs smoother. Video two: Set idle for IAC 2-8% and TPS 0 3. The Sniper EFI IAT sensor is a circuit board sensor that measures one throttle bore. I haven't … Tuning Your Engine Startup How efficient is your engine startup? Do you have issues with cold start that go away with warm start, or vice versa? Let’s dig down into that a bit and see if we can … 1968 Camaro 396 big block. I'm having a really hard time with my Sniper &amp; HyperSpark setup. Introduction Ok, we have enough Sniper systems out there that I thought it would be a good idea to create a posting on challenges that might arise during installation. AFR was 32-34. It seems to be running super rich and bogs out and stalls unless we raise renidle to over … Today I'm going to give you some tips and tricks on setting the choke adjustments as well as the fast idle on a Holley carburetor. It feels like it's either not getting gas or … Sniper EFI Tuning & TechNever mind, all was working great until suddenly during my test drive I suffered a major power loss. 0 AFR, so I lowered Learn and Closed Loop Limits to ±5% in this area. Took the Corvette to breakfast this morning, and under acceleration it felt like a light miss or stutter. 5, cruise at 14, and WOT at 12. But I think for … If you're using the Holley/Sniper supplied default timing setup the system can easily bump between a low and high advance causing idle to change. What's a typical RPM Above Idle To Enable Idle Control setting? My normal idle speed is 1300 RPM, so would I be looking at maybe 1200 … Just stay off the ramp (keep the timing above some ridiculous minimum number) and it has a rather large window after that due to low pressure of idle and cruise not risking fuel volatility. I've spent quite a few hours tuning/driving the truck and my Base Fuel Table has shifted incredibly far … Get reliable Holley Sniper EFI Troubleshooting advice. The same is true for the Target AFR. When the rear throttle shaft has issues, it very often happens when the … Hi all. I did the two step timing synchronization, and it ran good until today. My truck has been acting weird last couple of weeks, so I decided to hook up the laptop and live data stream to see what was going on. I have set up my 350 in my 48 Ford PU to run pretty well. Engine runs fine off idle and WOT. When I go from Park to Reverse, or Drive, the idle goes down to 200 RPM, almost dies then … The Holley Sniper system is relatively powerful and relatively inexpensive for what you get. How it idled at 500RPM the first time I fired her back up, I have no idea. worked fine while idling and driving harder. com/showthread. The issues started at about 400 miles on the odometer. I don’t understand … Surging IAC and hot idle issues on my Holley Sniper equipped LS1 After reading through numerous threads on the Holley Sniper Forum about similar hot start problems it appears that you need to download Holley's software to a lap top (which I don't … I wanted to follow suite with the popular FiTech tuning tips thread but being more specific with Holley information. I'm relatively new to Sniper installations and this is my first larger HP Sniper … I've been slowly approaching what I think is a good idle. stroked to 496 cu. I have a sniperstealth witch dui ignition and Holley in tank pump. 21. Doesn't do it all the time and only does it when over 170 degrees. You may have to register before you can post: click the … I have a 1979 International with a 345ci V8. Sniper 2, basically stock Mopar 383 with a mild cam with 5000 miles on it. holley. Wile testing my new windstar fan set up the can got to 200* and when it did the IAC started acting up. So, if you're experiencing problems with your Holley Sniper … To start viewing messages, select the forum that you want to visit from the selection below. 1/370, 7. The throttle hangs and won't return to idle when I left off the gas. Thanks! Also, no timing control by Sniper at this time, just HEI, no 6A box, etc. This explains the idle speed screw/IAC Position % relationship that must be … I have a Holley Sniper EFI that surges at idle. 6 I know this is a default setting for a lean condition . Three times now I have come to a stop but the idle ramps up to 2000-2500 rpm, without my foot on the accelerator. Your Sniper appears to be working just fine. I can be driving … Holley Sniper Running Rough & Dying Engine & Drivetrain The idle circuit does also have an affect upon part throttle driving until the opening the plate clears the entire "off idle" slot. Please be aware that this is a community forum. Discover troubleshooting tips for issues like vacuum leaks, improper adjustments, and worn components to restore smooth … My 40 has been sitting for some time…. I installed the Sniper … Learn about Holley carburetors troubleshooting where everything from basic troubleshooting tips to advanced diagnostics and tuning procedures are discussed in great detail. Sniper EFI Idle Setting/Throttle Blade Setting (Holley Sniper EFI Quick Start Manual): Once the … Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. Hot idle is now acting as shown … I installed the small bore 2GC on my OMC GM 3. My engine is a 427 cu. Getting the throttle blades and IAC to work together will keep … However, at the end of last week my brother was borrowing the car and while it started off running perfectly, about an hour into his drive it suddenly had a rough idle, black smoke, and bogging … Troubleshooting - engine idles rough, stall Bill Tichenor 12/02/2009 10 min read Switching to a Holley Sniper EFI system can transform your vehicle’s performance, but starting problems can be annoying. My troubleshooting efforts so far include: … Hello. 2% (the IAC value is 40% aka 4% increase is blade %) When I barely touch the pedal and move it 1% the IAC goes to 0 which … My idle I feel was tuned pretty well at 14. 230°/236° @ . 5/460) - Holley Sniper 460 - Backfire / Low End Torque Issues - Hello Everyone, Just have a couple questions regarding some datalogs from my … Sniper EFI Tuning & TechOriginally Posted by Danny Cabral Quick Datalogger Information: Always provide data, not just symptoms. I have 396 with a Holley 4150 750 that I continously run into problems with gas leaking inside one of the corners from my understanding is a result of the float's getting stuck? Anyhow, I … Said I'd do a review on the Holley Sniper, so here it is. … I recently installed the Holley Sniper on my SBF 302 in my 1980 Mercury Capri. In Higher RPM its fine. Upon installation and initial test of the rebuilt carburetor I … Sniper EFI Tuning &amp; TechMay God's grace bless you in the Lord Jesus Christ. What I've come to realize is … It's been a struggle trying to get this new Sniper EFI to run right. ) So the new IAC has been working great for a … Truck is a Ford F100 with a 390 FE engine. This is where it gets interesting. I've attempted to follow steps read in the manual … I'm experiencing a bit of a rough idle though, idle fluctuates between 750-800 and I can't quite get it totally smooth. I tracked down and fixed the leak. Once you find a "happy spot" for idle, then you can manually adjust the tables and then … AMC 304 w Sniper EFI, rough idle, died hot Jump to Latest 3. '92 Ford Mustang GT: 385"/6. 8K views 3 replies 3 participants last post by rednari2 Feb 12, 2024 wrp Discussion starter Sniper EFI Tuning & TechOK, that makes sense. However, since individuals who have little experience with engine tuning … Dipping my toe into the Holley Super Sniper tuning software and something puzzles me. After fixing these issues I still could not get the truck to idle without turning the closed loop comp on the Sniper up to 200%. 5&quot; TSLCD on the same firmware version, … Your Target AFR values are a bit on the rich side, but for now, focus on battery voltage, idle speed/IAC, your timing setup, and turning off the basic I/O (fans, A/C). 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've been having an issue with the Sniper 2 EFI since I installed it, hoping someone can help me. This is … Ok, I've tried everything I know of to get the idle speed set properly and I'm not having success on all fronts. I installed my Sniper 2 in March of this year. It was … Holley Sniper Fast Idle Jump to Latest 4. It runs very rich and rough in idle. My Sniper system runs awesome, especially since adding the HyperSpark ignition. It only happens above 1800ish RPM. I … Ensure the idle speed screw on throttle body, is adjusted to achieve an IAC Position of about 2-5% at hot idle. Big Block V8 - 385 Series (6. Ever since day one I've been having hard … I'll be having my Holley Sniper installed soon and I'm wondering how to find out the target A/F ratio to enter in the parameters for the initial start up ? I know that most vehicles nowadays aim … Backfiring, lean run, plug fouling, poor idle, stalling - FINALLY FIXED! - Holley Performance Products Forums Home Forum Holley EFI Sniper EFI (The Sniper EFI 2 bar MAP sensor is internal with the ECU. Posts Latest Activity Photos Page of 2 Filter https://youtu. … Holley Sniper EFI systems - Troubleshooting help page kiwigtx Aug 12, 2023 1 2 Next Sniper EFI Tuning & TechKeep this in mind, I'm speculating here: I believe there's a unique situation with the Sniper throttle body in the manner it delivers fuel and there's a tipping point … Hey everyone, I’m currently dealing with a lean tip-in issue. 050&quot; camshaft. Holley Sniper EFI systems - Troubleshooting help page It is an … RPM Above Idle To Re-enable Idle Control: 50-200 RPM (This setting can be finicky. Even after reaching < 165°F idle is still rough, but not as bad. I discovered this by trawling through online forums where … So my Sniper has been running pretty good for a while, but lately my idle has been fluctuating from stop to stop. Closed Loop is working, but driveability off idle is rough, especially from a stop. Starts &amp; idles fine. I had no running issues with the vehicle prior to Sniper 2 installation. This will not likely help your start, but should help to get it to return to idle a little better before you start to fine tune. Holley has a fix for the way the throttle snaps open. ) Not IAC, but Idle Spark control usually works well at: 30-40 P Term & 50-60 D Term. WOT should be around 12. Since the install, the car hasn't run well. When I ran a carb my ignition timing with mech … If you are using your Sniper EFI System to control timing, navigate to Tuning > Advanced > Advanced Idle > Idle Spark and ensure that the Idle Spark Enabled is set to Disabled. Vibrating and shaking. Well about 3 months ago, my AFR is all over … Tech Tip: Quick video involving a Holley Sniper EFI on how to evaluate a high idle issue involving the secondary butterflies sticking in the open position, also a DIY way to fix it at home without Hello. Handle idle surges, no-start issues, and sensor faults with proven methods. Holley 2300, 2 barrel carburetor troubleshooting. Correction for me was moving O2 … I'm working on my twin turbo big block and I'm having trouble with poor start/no start and rough idling. Hopefully someone here with more experience can help me out. Forged rods. Also it has always had this … I'm running a brand new Ford Racing 302 crate engine with a Holley Sniper. 3L SBF, Dart SHP 8. Video one: Add a wind to the spring 2. Holley Superchargers are designed for trouble-free installation and operation. 8L boat a few years ago and have been chasing hard start, rough idle, stalling ever since. AFR is swinging around, but never shows to be going overly rich or lean. Over the past week or so our Mk4 has had a long crank time. I did the Learn process and IAC Position settings per the Holley videos. Closed Loop is on, Learn is on, the CL Comp numbers are low and the Learn Table … Why are you using the secondary curcuit to control idle?? set them back to closed and properly adjust per holley specs. I installed sniper on a fairly stock 350 about 2 years ago. Besides smelling rich, I can pump it twice, start it cold with no choke, hold it at 1500 for 30 seconds and it will idle at 950 in Park. THey are all good info. In fact, sometimes the car won't start at … Just got my first 110. The air fuel ratio spiking to 35 to 50 and stalling out after driving between 50 to 60 miles on … Hi folks! New to EFI, so please bare with me. My block is . I have Config File, but I need to create and attach datalog files. Datalog &amp; Config File attached: Well I'm pretty stumped. First off, I picked up a 1984 GT350 a couple of years ago that had most of the original parts in it yet, including the dial snorkel air cleaner. I have about 5k+ miles on it. Is the AFR & ignition timing optimized? Overlay … We have the BluePrint 347 with the Holley Sniper EFI in the Mk4. The Sniper doesn't create or modify these values. :) I'm left with a … First off thanks to everyone who has been helping me get this thing running. The main issue I’m having is that during hot idle, the idle speed will sometimes surge in a regular pattern … Hello All. My car was starving for fuel and breaking up bad. Although, it will idle very low (500 … Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. Once above idle, where the Sniper indeed does vary timing to help maintain your idle speed, the timing values come straight from the table. Hi All: Last year I bought a heavily modified Porsche 914 with twin turbos, running a Holley Super Sniper. The Sniper is unable to achieve a steady idle and cycles every 10 seconds or so between about 880 & 1400 RPM, during which time the best I can … I attached my current Config File and most recent datalog. be/0C6gDAH1AGU Join the Holley Family Stay up to date with the latest releases, events, promotions and more. I have a minor leak at the 02 sensor that I … Running a Holley Sniper with Hyperspark dizzy on a stock Buick 350. This is done on my 1990 T What I did was looked online and found a bunch of Holley videos on rough idle and watched them all, looked at IAC tuning and TPS tuning. 6 every 30 seconds or so then catch its self with extra rpm to keep running. I found that many people had similar issues and … Chasing a lean AFR spike and off-idle stumble/stalling on a BBC with Super Sniper and manual transmission. The issue I'm having is when I set the idle with … My throttle is very slow to return to idle when I come off the gas. I recently bought a truck that has a 350 Small Block and a Holley EFI Sniper 2. I finished my Factory Five Roadster about a year ago. So It's still never run right, out of the box. Start the engine … Good evening. Below are the specs of my engine: 434 SBC, large cam, 7&quot; vacuum at … Recent issue with my set up. I've wrapped the secondaries spring with another wrap, I've replaced the throttle cable and added and extra return … Hey guys. 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 … Been troubleshooting the Sniper 1 for two years now, getting close to removing all issues, but few more to go. After this starts, it also develops a problem idling, … In this video, we explain the most common fixes for a off idle stumble on your Holley Carburetor. went through the basic setup procedure, timing, 12 & 34 idle, ect. Should I keep it in … Sniper EFI Tuning & TechOriginally Posted by Danny Cabral Is the Sniper EFI Learning? Is the ignition timing synchronized? Is the fuel pressure 58-60 psi (LINK)? IAC Position of about 5% … Ensure the idle speed screw on throttle body, is adjusted to achieve an IAC Position of about 5% at hot idle. On two occasions has started running rough with no ability to accelerate while cruising easy at 35-40 MPH. I'm a 20 year … If you are using your Sniper EFI System to control timing, navigate to Tuning > Advanced > Advanced Idle > Idle Spark and ensure that the Idle Spark Enabled is set to Disabled. When I accelerate and lift off the throttle quickly, the AFR shoots through the roof (lean) and the engine has … Engine:289 SBF Carburetor: Holley 4160 600cfm Fuel Pressure: 4psi regulated Recently I sent my carburetor to be rebuilt. You may have a misifiring injector. First start went well (just started, not run up to operating temp yet) but I need to set initial … I have been having some issues with my CJ7 with the i258 running the Sniper Holley EFI 2BBl BBD. I had to change my primary idle feed size to a . 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. There's no time to start or take a datalog so I cannot capture one. Installed the Sniper 2 with PDM, Hyperspark distributor and ignition box. From day one, I've been plagued with a situation where the car almost stalls when you come off the throttle (like pulling up to a stop sign). Now won’t run well at all. At 850rpm the idle is marginal and pretty rough, but at … I'm having problems with my Holley Sniper. About six months ago, I started having intermittent misfire … The base Holley tune after putting in engine specs has idle 13. The Shop that did the bulk of the work did an excellent job with the grounding and I have had no issues with … They're simple and free to fix! The first is a high idle that seems to be coming from nowhere, and the second is a Throttle Position Sensor/TPS not resetting to zero. Idle is typically around 13. The initial timing Tuning Your Engine Startup How efficient is your engine startup? Do you have issues with cold start that go away with warm start, or vice versa? Let’s dig down into that a bit and see if we can … Ever since I put my motor together its run a bit rich. System comes out of the box set up to run extremely rich from idle on up. After fighting it for a while I simply shut the program down, restarted it and loaded an earlier file. Since I … Holley sniper cold start crank EFI TechPY Online Forums - Bringing the Pontiac Hobby Together > General Classic PONTIAC TECH > EFI Tech > Holley sniper cold start crank As a test, I switched the timing back to conventional, with the Holley just running the fueling So to do that, I disconnected the white wire from the 10 pin Holley harness, to the MSD DIGITAL 6AL box (#6425) points trigger (also a … Finally got the sniper wired & plumbed in the 351c. With that cam and the fact that the Sniper doesn't always like lower idle speeds, I would select a target idle of 900 … I put an IAC valve from my own Sniper that I had on the shelf in and the car seemed to return to idle differently at a different rate than what was in the car, but the random idle hang … One way to get a rough estimate if the PCV valve is wrong for your motor is to compare the idle speed change when working or when you block the flow thru the PCV valve with your finger … my bad Holley bosch sensor had similar surge spot under light throttle. The Idle … Hey All, After the conversion to Holley Sniper EFI, my car is having an issue surging during cold start. Ever since I got the truck it has had a really bad surging issue at … 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 … Trying to tweak idle settings and I noticed that as soon as CTS hits 150°F, MAP goes higher and idle becomes rough. Had external shutoff wired in, but have since bypassed it to try and narrow down the problem. I have a Cobra replica here in the UK running a Ford 418 stroker, AFR 205 heads, Edelbrock Air-Gap and a performance camshaft, and I currently have the car in garage installing a …. The EMI was a brutal fight. I mean it runs but way too rich & severely plugs the … You should be able to add fuel and smooth fuel tables with the Sniper EFI computer software. I have a Sniper powered 427W. More power, reliability, it was all gravy. 7K subscribers Subscribe Got an odd one. ENGINE SIZE: 350 HOLLEY SETUP USED: 600 HP Sniper in shinny finish ENGINE VACUUM: Thinking it's around … I'm trying to resolve a couple slight annoyances that I'm having with my Sniper. By identifying common issues and solutions, you can troubleshoot efficiently and enjoy the full benefits of … Sniper EFI Tuning & TechOriginally Posted by Danny Cabral A loud fuel pump is usually an indication of fuel pump cavitation or maybe a clogged filter (s). If so, you may have a vacuum leak at hot temperatures that's causing you to close the throttle … I have a BPE 347 with Holley Sniper EFI, all settings as came from BPE. I think I did it right, let me know if there's a problem. … #holley #free #fix #supercharged In this video I go over two issues that slowed down my Holley Super Sniper 2x4 install. You'll have to shut the engine off and turn it … A rough idle may show some RPM variation, but usually when you dwell at a higher RPM, the signal will smooth out and at higher RPM in your datalog the RPM signal is still noisy. If you think that the idle is set properly, collect a 30 second datalog of the engine at operating temperature with no … Holley sniper efi Tips on setting the Idle air control setting % between 0&5% engine factory 4. I’ve cleaned the floats and tried adjusting them and the mixture screws. I've eliminated most of the noise, best as these newbie eyes can tell anyway. I installed a Holley Sniper Stealth EFI in 2020 with my new 383 stroker build. I tightened it back up, but it didn’t solve the issue. 5760#post45760 … Was off today, so decided to take my car out for a spin Started and ran great, drove it around a bit, no problems whatsoever Stopped home to grab a quick sandwich, then came out and … Sniper EFI Tuning & TechYes, wiring is correct. For the first year and half, everything ran great. I ran it on the dual plane too. One of my very best friends installed a Holley Sniper system on his Bronco project. fired up & sounded awesome, took it out for some street driving & started missing a beat, took it on the … Sniper EFI Tuning & TechWBO2 sensor was loose. This … Part of the shipment that arrived was a new PCV - supposedly correct for the Sniper (or any EFI system) - small fixed orifice instead of regular large and variable internals. 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. Just took it for a spin and when idle the AFR reads 9. The correction percentages have gotten low mostly under 5%. It's a progressive linkage and a … The Sniper tends to not like lower idle speeds so you may want to set the target idle speed at 750 and then adjust the idle stop to get the IAC set. 8 and Cruise should be 14. Problem 1: Engine will start and run rough, must keep foot on gas (~10% throttle) to keep the engine running for a short while, then it may idle on its own. Start the engine and collect a datalog for about 15 seconds. Lately an issue has slowly developed where the engine will start and idle just fine but … I don't think that 70 or 80 psi will push out the injector. Full control of fuel and timing. 0/429, 7. Discover troubleshooting tips for issues like vacuum leaks, improper adjustments, and worn components to restore smooth … Based on what we know about the Sniper's injector connectors, that's the first place l'd look after verifying proper fuel psi and looking in the throttle body while it's idling to see if all the … Brief summary of vehicle: Engine: 400ci SBC Trans: 5-Speed TKX History: No known history on the Holley Sniper unit. Just push the record button before you startup the engine, and it will capture all of the data. It seems to settle … 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. It was running rough and leaking oil, so I decided to pull the engine and rebuild … I've been test driving car to break-in new gears. I recently installed the single barrel Sniper on a KEI truck, 660cc 4 cyl engine. You may have a misifiring injector. The problem is sometimes when … Holley Sniper Injector Problems- How to fix themAre you experiencing rough idle, slugish performance, lack of power. 8 I checked all 4 barrels are … Put an end to mysterious air/fuel ratios, jet changes, and cold-start rough idle troubles with Holley Sniper EFI. You may have to register before you can post: click the register link above to proceed. In the last year I have been struggling to fix a consistent hesitation I get under acceleration after it warms up. Holley Sniper EFI; no idle screw adjustment, just throttle blade setting after warmed up, if I'm reading the manual correctly. Where is the location of your Sniper Temp sensor, in the manifold? (should not be at the radiator) And I assume the idle … I have a BP 347 with Holley sniper that has been starting and running great. Hi, I'm having problems with my 302. … Hey guys we just installed a Holley sniper on my dads 454 and were having some trouble with it. To thoroughly clean injectors, they need to be back flushed … Sniper EFI Tuning &amp; TechThere's a difference between cleaning injectors for maintenance and cleaning them to diagnose a problem. ECU and 3. Then shoots back up &amp; down until it … Sniper EFI Tuning & TechI used the idle speed table to set my idle speeds at different temperatures. 1) When the 40 is cold or warm and I decelerate to a stop, the AFR jumps up to 18-20 while the idle goes to … What You Didn't know about IDLE CONTROL with Holley EFI! Joe Simpson 39K subscribers Subscribe Holley sets the Sniper up to run very rich and I think this is the problem. The old Sniper … I took the car out for a run after spending $3600 (:-o) having it tuned, and when warmed up the idle went super high while both driving &amp; stationary, like 2400/3000 RPM high. 9L inline with a Sniper 2300. Although Holley employees will take part in … So I set the target idle to 1000 rpm on the Sniper. They're simple and free to fix! The Switched from a dual plane air gap to a Holley single plane intake with my Holley sniper efi. Haven’t had a chance to test the sensor itself yet. Raced and hot-rodded Holley carburetors for many years. Sniper EFI Tuning & TechSurging is usually caused by the AFR being too lean. Ensure that your manifold is properly seated and that there are no leaks at the Sniper base or any vacuum … ive been working on getting my car to start up a little easier seems like im chasing my tail here combo is 392 cubic inch sbf with an 88mm turbo 10-1 compression 160 lb holley injectors … Holley Sniper Injector Problems- How to fix them Are you experiencing rough idle, slugish performance, lack of power. Probably more base … The idle has to be set properly before attempting any other corrections. About six months ago, I started having intermittent misfire issues. Look at the Data … Is your Holley carburetor stumbling or stalling on idle? This helpful guide will get you back up and running in no time with the perfect idle. Over the past couple of weeks I've developed a strange problem. This is on a '68 Firebird 350, manual transmission, pretty stock. 1) I … Hello I have a issue thats been bugging me with my chevelles sbc 350 with a holly sniper. … Car has a rough idle and is popping through exhaust, also smells to me to be running rich at idle. I have an '84 F150 with a 351W with a mild cam. The last Sniper just lost power and is with Holley for troubleshooting. When dropped into gear and the trans converter load slows … This may be due to the rough idle, but it may also be contributing to the rough idle. … Holley sniper has been on the car for approxly 50 miles. http://forums. In the Idle ICF, the "Target Idle Speed (RPM)" must be programmed to the … A friend of mine has a 1975 Scout 2 w/ 345 and Holley Sniper EFI. It seemed to idle a little smoother in Open Loop. I have my idle set at 750 and my IAC Position has been around 8-10%. It's fairly easy for pump gas performance cars. Here's the lowdown: Fresh install in a brand new 302 block, stroked to 327. When you have carburetor problems with your 2300, this is the place. I was … Fuel was being delivered to the EFI but the fuel map suggested it wasn't getting enough fuel. After a short drive it started idling very rough, … 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 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. 1969 Corvette, SBC 350, Holley Sniper EFI, In-tank fuel pump & HyperSpark ignition. Was able to get the truck driving mostly decent by building a Base … Engine: 351W, stock cam, headers, Pertronix Ignition (no Sniper timing Control). … Setting the idle mixture and speed on a carburetor isn't the most exciting or elegant subject, but it is a necessary adjustment that often is overlooked or worse, set up incorrectly. With it hooked up the engine will be shaky at times and no amount of adjustment will get rid of it. 2K views 15 replies 6 participants last post by ChrisReyn May 25, 2023 dankwen Discussion starter I drove it for 10 minutes and plugs were fouled (dry black sooty), low on power, low vacuum (7-8in at idle), slightly rough idle, and under load or attempting WOT results in studder … Next problem has was getting it to idle smooth but always quit on me so it seemed very lean. So, I decided to make the switch – largely due to a better control of fuel / timing for a blow through super charger application. You've got it running and warmed up but now you need to set the idle. I’ve recently installed a Sniper 2 on my Ford 427 and seem to be having an issue with idle control and the IAC. We swapped out the carbs for the Holley Sniper and it works great! When I first turn it on it isles perfectly at about 1100 rpms, not sure if that’s where it should be but it holds perfectly … Sniper EFI Tuning & TechChris I can tell what my experience was with running 29°-30° at idle. Once you get the idle … Preventive Maintenance Regular Inspections Seasonal Storage Tips Frequently Asked Questions Why Is My Holley Carburetor Leaking Fuel? How Do I Adjust The Holley Carburetor Idle Mixture? What Causes Rough Idle In A Holley … Adjusting the idle mixture screws on a Holley carburetor is a key part of tuning your engine for optimal performance. Glad to be here. Ive been running a Holley Sniper for a about four years now. I found that many people had similar issues and the pressure regulator in the Holley Sniper isn't great and can fail. 5, but it can vary depending on the engine. It has a Pro-Billet distributor, 6AL and the Sniper. I tweaked a whole bunch … So my car starts fine runs then a few seconds later the car idles rough almost stalling basically starving for fuel. Also installed hyperspark ignition. I just installed a Sniper 2 into my '65 Mustang, and in general it's running fine. If … On the Holley Sniper throttle body EFI system, is there a website showing how to change the Cold Start up, Warm idle, WOT and cruising speed A/F ratios on the hand held controller? Hello all. After installing the HyperSpark 565-300 kit to my existing Sniper setup (which was working well), I'm having problems obtaining a smooth idle. If your car or truck is equipped with a Holley four barrel carburetor and stumbles upon … The Holley Sniper EFI system brings modern fuel injection advantages to classic cars, but users should be prepared for potential flooding issues. The increase in cold idle RPM makes the throttle blade 15. Idle drops down and almost stalls (sometimes does stall), then surges up to 3K RPM, then drops back down. I'm new to the EFI platform. Here's a video: For the record I have setup the EFI to control the … I did some searches but couldn't find what I was looking for. The idle has been adjusted per Holley spec OK so the Holley tech said, according to the readouts, that it was due to the (new) 02 sensor. 6 afrs when it cutted out and … Good morning. Inspect/troubleshoot/service the … Is it running better than it was a few days ago? How does it run compared to when you first starting having problems? Is the idle speed steady? Some if the dips in the RPM signal are not … If the idle goes high, then you know it's not the IAC, air is getting in somewhere and the Sniper doesn't produce air. I took one … At idle the pcv valve is totally open and makes a big difference in idle speed with it there and unhooking it. … Cure The Bog And Sluggish Response On Your Holley Four-Barrel Carburetor, By Properly Adjusting The Accelerator Pump Assembly. Sniper EFI Tuning &amp; TechIf this is your first visit, be sure to check out the FAQ by clicking the link above. Bosch part number #17025 Be sure to buy at a reputable parts store. Runs good once warmed up and great under WOT. Not sure if it takes the computer … If the timing curve checks out, then you can try adjusting the idle mixture screws out richer 1/4-1/2 turn from best lean idle settings. The close proximity of the wiring through the … Holley Sniper EFI IAC Surge - Idle Air Control Problem FIXED! Try this before sending it back! Half Fast Garage 16. If you have a laptop you can quickly find the best idle AFR for your engine by adjusting the Target AFR … The Sniper tunes tend to be rich but just for the sake of testing, select the street/strip cam. readjust timing and reset the idle mixture screws. In summary: 1. The truck can be hot/cold at parked idle and when I slowly accelerate to 2000 RPM and … Hello. From a 30 second capture my MAP (kPa): Min: 67 Max: 73 Avg: 70 StDv: 1 Note 1: This data is in the new Sniper 2 Datalog view … Hi. From reading on setting idle mixture screws and idle circuit tuning I got the symptoms mine was … Been tuning a Sniper 4150/Hyperspark combo on my own for over 2 years now. 98$ at … 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). I've been trying to find the problem for a year and haven't made any … 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 … The current AFR table is auto generated by the sniper with idle at 13. He just Learn the common causes of rough idle in Holley 4150 and 4160 carburetors. Assuming your engine idles around 800 RPM with a KPH of 53 your fuel table lists a fuel Lb per Hr of 5. I've attached Config File and a data log I did while … Sniper EFI Tuning &amp; TechGreat thing about the Sniper is that it has a built-in datalogger. I have a fresh built Windsor (351) with an 'E' cam and full Sniper-Hyperspark system. From day one, I've been plagued with a situation where the car almost stalls when you come off the throttle … Whether you’re experiencing rough idling, stalling, or poor performance, this blog will provide practical solutions. 1987, LHD, 3. Use Sniper touchscreen to reset the idle. Here's the … Car suddenly wouldn't idle and I couldn't keep it running without revving it. On the way home it ran fine. The other day it started idling at 15-16 AFR and running rough once hot. This v The Sniper does not always work well with lower idle speeds. The easiest thing to try is making the Idle air bleed smaller. I'm running a brand new Ford Racing 302 crate engine with a Holley Sniper. I did a bunch of research on the Holley forums. Currently having some trouble getting this vehicle to idle &amp; perform initial Learn sequence. 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 Timing … If you get on the sniper owners page and they will help you download what the sniper is doing at those points and help you fix the issue. I have the Holley HyperSpark, just getting the fuel side right before I add another variable. To … Just got my setup up &amp; running, but having an issue where the idle just won't calm down. Pinch the hose and it … Sniper Stealth EFI installed 7 months ago. 5, how do these numbers sound and how does this table look. The Sniper timing can be setup to mimic a vacuum advance scenario at idle. This video will show you how to diagnose a bad injector or an … Not to start another thread, Holley recommends 12-920 for single Sniper EFI, which I bought, could it be that dual quad 2x4 needs a bigger pump? Usually fuel pump calculators care only … Discover common Holley Sniper EFI Problems, troubleshooting tips, and fixes to optimize your EFI system's performance. - Holley Performance Products Forums Forum Holley EFI Sniper EFI Recent issue that has arisen with the colder weather. I recently acquired a '74 F100 4. It was running fine for a long while. I've been reading through this forum which has been a wealth of knowledge and finally made an account. … Something new started happening when I drive the truck. 4) … Idle was rough at 20% Learn, hit Smooth, now Learn is at -5% & misfiring. I've looked at the datalogs (one under acceleration, and the … Hello guys. 030" over, I'm running Trick Flow heads & Stage 2 CAM, MSD Billet Distributor and MSD-6AL box … For primary bore idle carbs the classic mode with big cams is to drill air breathing holes in the primary throttle plates, which corner designs are intended to avoid. 5 for 2000 rpm on up all for kpa < 80 and of course richer above 85 kpa. Since then I have had an issue where the AFR will suddenly slightly … Are you experiencing random high idle with your Sniper EFI?Could be caused by the rear throttle plates pulling openHeres the fix! Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. in. got worse pretty quick sensor showed 35. 0 HO (1990) and it … Good morning. Issue: Just got the … This is a replacement Sniper on my new 496 BBC. I have a sniper on my '66 with a 5. He is a super-meticulous guy, and he said he followed the directions to the letter. Check for ignition misfires/RPM signal problems, exhaust leak upstream of WBO2 sensor, or if the WBO2 sensor (or other sensor) has failed and corrupted the Learn Table. To thoroughly clean injectors, they need to be back flushed … To start viewing messages, select the forum that you want to visit from the selection below. It’s happening with very slight throttle input coming off idle from a stop or slow roll. Bottom line up front: What are good AFR goals This information is provided as a helpful supplement. We aim to make troubleshooting straightforward and stress-free. Affordable aftermarket fuel injection is here and it couldn't be any easier to install on your vehicle. There's a lot of useful information here. I have a Super Sniper 550-519, and I'm having some issues with it since … hi everyone, i did an efi conversion about 18 months ago - i know it was running rich from day 1 -running high RPMs at idle, but i fell in love with the peppiness of the action - but lately for the … If you have a laptop you can put the Sniper into Open Loop and manually find the best AFR at idle. I am having a couple issues. AFR is 35. Getting the throttle blade I always had a off idle hesitation when opening up the throttle slowly but never when I hit the throttle quickly. 2K subscribers Subscribe The Holley Sniper "family" is known to have RFI issues - with the old distributor-based ignition systems (on the older V8s that they are intended to be used on) The prevailing theory is that the firewall can act as an antenna for the … Just installed a new Holley I’ve been trying to adjust it for a few hours, but the best I’ve gotten was running, but with a super high idle. Then he had a miserable … It seems that most sniper-related issues that folks run into are the injectors (usually an issue on initial installation) and the O2 sensors (develops over time). It also felt like the engine was misfiring occasionally. First time posting here, but I've definitely used this forum as my primary troubleshooting source. 5 up to 1800 rpm and 13. Today while driving, car started running rough during acceleration, but would idle OK. 8 for 1900 rpm then 14. 031 which is quite a change from a … However, I still have issues at idle. 6-71 … Truck is a Ford F100 with a 390 FE engine. I figured I'd post a datalog and my current GCF … Sniper 2 HyperSpark distributor was just replaced about 200 miles ago. The Fuel Flow lb/hr 8ish - 13. Sniper EFI Tuning &amp; TechJust installed Sniper, have a few hours "Learning". Holley Sniper EFI is a perfect … CD Box Ignition (no timing control) setups must have the Tach Output Wire from CD box connected to the purple wire (Crank Signal Positive) in the Sniper EFI Harness, using the provided … For your engine setup you need more timing at idle - likely 20° to 22° rather than the 12. 6, then will spike to 35. IAC at 4% but drifts as well… When the engine is warmed up, my Sniper will randomly start to run very rough and then stall within a second. It seems to be lean surging or something, it idles very high and comes back down to a very low idle. I've been working through fixing wiring issues throughout the truck including … Hey guys. with a properly set ignition and idle circuit your transfer slot … Rough idle, and poor AFR will result if one injector goes down - and probably due only to a loose or dislodged cable connector. Sniper EFI Tuning & TechAre these new symptoms or has it always done this? It is nearly impossible to diagnose without data. I finally got the idle straightened out, but it required turning the idle screws out to give the best idle in gear. jerae bdiogrhy xbt wkga msyq oppof uzcxin uoboto uqjk mkmwhc