Holley sniper running rough. From what I've read, could be a bad ECU.

Holley sniper running rough I've had it on and running fairly well for 7-8 months. Plugged in the laptop to the CAN Bus and it said it needed to be updated. I've checked the exhaust system for Holley EFI Troubleshooting: A 3% Error Caused THIS! Want to Learn How To TUNE Holley Efi, Terminator X, and Sniper? https://www. tunethetrilogy. You Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. I appreciate any help in advance. Download the Holley Sniper EFI software and look at Good afternoon all. I've been patiently waiting for a response from Holley tech support for a few days. I raised the Acceleration Enrichment to about 55. Login or Sign Up Logging in Remember me. Very smooth otherwise. Excessive Fuel at Startup. Edelbrock RPM Air-Gap Intake. Only changes made other than the throttle bodies were needing to extend the main harness for the Sniper from the battery side not the throttle body side. The garage is a well respected performance shop here in the UK, but they haven't fitted a SNIPER kit before. 1969 Corvette, SBC 350, Holley Sniper EFI, In-tank fuel pump & HyperSpark ignition. Got the Mustang started ran good sounded good, pressure gauge still was reading 68 psi like the last Sniper did. One problem fixed, but now rough running 383 stroker. U. Wondering if it's a bad WBO2 sensor or stuck injector. It appears the Sniper itself is being the ground. Sometimes a throttle blip would correct it back down, but in a couple instances it Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Car has been flawless for two months when coming home from grocery store it felt like the fuel pump had given out. May God's grace bless you in the Lord Jesus Christ. Any attempt at adjusting the temperature enrichment before the base fuel This is my first post. 10 min read Share Troubleshooting - engine idles rough, stall. 504#post271504 (Holley EFI Typical Idle And/Or Running Problems) May God's grace bless you in the Lord Jesus Christ. The rough running may cure itself as the Sniper learns. 7 Lb/Hr or 6 1/2 times more fuel. Cold starts flawlessly, but idle isn't great and idles very rough when in gear. Sniper starting & running rough, and now won't start. Pulled it out, put the Duraspark back in and no issues. When I had the car dyno'd it ran until I tried to drive it home. This is the 8th Sniper I’ve tuned, but the engine is a fully rebuilt 289 Ford and on the dyno for break-in. "Holley" folder, "Sniper" folder, "Config Files" folder (. 470" forged Sniper EFI Tuning & Tech. 6 AFR. I've managed to get the Sniper running extremely well on my '84 CJ7 with a brand new engine (less than 700 mi on it!). In the last year I have been struggling to fix a consistent hesitation I get under acceleration after it warms up. So I recently swapped from my standard Sniper to a Super Sniper and I’m having issues with the truck running right. After ~10mins of running it will die out. . 1733 Posts. After about a month I figured out the rattle was a I'm running Sniper kit #550-511K, MSD 23803 Dual Sync distributor, coil driver module 556-150, and coil 556-152. 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 Holley Sniper Stealth system. Are all four supposed to be Hello everyone. Removed Holley 870 CFM carb that came with the motor. The engine will die when coming to a stop. I've locked out the vacuum advance on the distributor and installed an adjustable rotor, set to 15° BTDC Cranking Timing and 15° rotor retard. Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and Yes, the wrong converter can make it really difficult for the Sniper to keep the engine running. But on the handheld it was Now I’m wondering if the Sniper is just flooding the engine (383 stroker). It was running fine for a long while. For the most part, runs wonderfully. When I turn the Sniper on, fuel pump #2 runs for five seconds and primes the system. com. No announcement yet. 030" over, I'm running Trick Flow heads & Stage 2 CAM, MSD Billet Distributor and MSD-6AL box with an air-gap intake. Pink wire run off relay, hot from battery, trigger from switch hot only when in run & start. No vacuum leaks, 20 inHg. Coughing, low on power, stalling. I recently finished my Factory Five Roadster and I'm running a Sniper on a Ford Racing 302. After I've driven the car and it's up to temperature, if I shut it off and wait 15 to 20 minutes, the idle surges badly upon startup. Skreddy. Announcement. 1. LQ9 with a Holley 4BBL conversion and 6014. Sniper engine run-on & relay. After pulling the trigger on the Holley sniper I'm now getting worried about fitting it, I've read that the EFI 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! author. When I go to start it the next day, it will have a rough start up. Had my Sniper EFI Kit setup and tuned by a reputable local shop a couple of months back. 623" lift/114° LSA H/R camshaft, Trick Flow Having issues with my sniper EFI setup. Engine runs great, but quickly gets hot and overheats (will get to 220°F sitting still and 210°F as long as you’re cruising). Video. It's also very rich, I've made a few adjustment from things I've read on this forum, but now I'm stuck. (must be the gauge). Hi All: Last year I bought a heavily modified Porsche 914 with twin turbos, running a Holley Super Sniper. If the fuel pressure is too high or if you have an injector stuck open, the AFR value will be very low - maybe 8 or 9 indicating a rich condition. It may be due to the cam and rough running but verify that all vacuum ports on the Sniper and the Sniper EFI Tuning & Tech. Thus, Holley can not guarantee an answer or timing on an answer. Stockish compression. Ever since day one I've been having hard starting issues when both hot & cold that I could use some advice on. Here are the numbers. Coolant sensor not hooked up at this time. Aug 25, 2024. Then this malfunction started and I continued to copy the Learn Table values, but Machine shop thinks it's the Holley Sniper causing the issues, so here I am. Everything has been running very well up until a couple of days ago when I noticed very strange throttle response and rough idle at a stop light. I’m guess Ive been running a Holley Sniper for a about four years now. Using the Holley Sniper EFI software (LINK), look at where the live cursor moves to during this occurrence, and Yeah, I've been playing with it all afternoon. 09-15-2020, 08:01 AM. Just come back to it recently, and was trying to find out what the problem was. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Plugs are now showing running rich. However, I still have a noticeable rich smell when at idle, despite the AFR reading 14 or so, which it is set at. It was running rough and leaking oil, so I decided to pull the engine and Truck is a Ford F100 with a 390 FE engine. ), installed an in-tank electric fuel pump, Holley fuel filter and pressure regulator, and -8AN braided lines all the way through. 02 My customer had dropped off a new Sniper and said he'd call Holley, but in the meantime just put the new one on. com Community Support. If you've followed my build, you'll recall that my car has experienced some rough patches with fouled plugs and running hyper rich, so the learn table that was in the Sniper before starting this exercise included data 1968 Skylark Convertible 383 Stroker, Turbo 350, 3. It felt like it was flooding out at low speed, low RPM. I'm running the sniper EFI with HyperSpark on a crate Chevy 502 engine. Ran a bit rough, but soon smoothed out. Assuming your engine idles around 800 RPM with a KPH of 53 your fuel table lists a fuel Lb per Hr of 5. Here's my issue. The engine ran great for break-in and through moderate RPM while varying Had my Sniper EFI Kit setup and tuned by a reputable local shop a couple of months back. Followed first start procedure without much trouble. I was watching the handheld monitor screen when it happened once and the IAC % went up to 100% and a bunch of red warnings occurred, then it stalls. Originally Posted by Danny Cabral The Target Air/Fuel Ratio Table & Base Fuel/Timing Table (and MAP kPa & RPM axes/scales) should be configured using the Sniper EFI software: In the Sniper EFI software (), Target Air/Fuel Ratio Table (Fuel ICF) & Base Timing Table (Spark ICF), select "2D Table" Type (not "Simple"). It has a Pro-Billet distributor, 6AL and the Sniper. But when the engine refuses to fire up as expected, that excitement can quickly become If the engine fails to start or runs poorly post-installation, the initial setup may have issues. Many drivers face flooding Engine barely starts and runs really rough at about 200 RPM until it finally goes way lean and quits. Any other tips or advice to keep your Holley Sniper EFI system running smoothly? Regular 1964 Corvette, Dart 427 stroker, MSD coil and distributor, all new Holley fuel pump and filters. 200" forged Part number 565-300. Installed Holley Dual Sync distributor 565-100 with plug & play harness 558-493 Removed gas tank and mechanical fuel pump Installed Holley EFI Conversion Fuel Tank 19-106 Installed MSD Blaster Coil 8207 The Sniper turns the fan on at 251 seconds and it continues to run OK until 374 seconds. But on the second drive after about 30 minutes, the car just lost acceleration. Weird problem with my Sniper 2GC. Datalog & Config File attached: Well I'm pretty stumped. It started running rough especially under throttle two days ago. For example, one owner solved issues with One of the first signs is the engine misfiring or running rough. As for temperature or sitting, there are some slight adjustments in the Sniper for air temp and coolant temperature, but they shouldn't make a big difference on how the car feels. Runs better, but the roughness is still present. First, I picked street/strip for camshaft type. South Texas 97; Aug 18, 2024; Replies 7 Views 2K. Any alternator/charging wiring that runs parallel to any Sniper wiring or near the TPS since it's often close to the alternator can introduce noise and cause poor running. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration . The Target Air/Fuel Ratio Table & The Sniper unit replaced my Mighty Demon 750 annular carb on a 408 Clevor build 512hp/520tq. Join the Holley Family. The IAC will open up quickly to keep the idle speed up, but if the fuel map isn't perfect the tight converter will stall the engine. or at least disable learning while it's Common problems include rough idling and stuttering. tech. Now I just need to drive Over the last week my Holley Sniper has been having an intermittent issue where it will start running rough and lacks power. First I read the AFR going too lean during acceleration. Attached datalog. It will pick up all those bad learns. 9:1 compression. Jan 30, 2025. Staff Writer. 35. D. All was running fine, was driving with no issues. Another symptom is the engine is backfiring or stalling. 73 Posi FiTech GoEFI4 600 RobbMC PowerSurge 500 I have a 72 nova that I recently converted over to a Holley sniper EFI. The Sniper controls pump #2 that is programmed to turn on when the TPS is 75% & above. It's running very well. While it was running rough, I touched a noise capacitor to all the power and ground wires for the Sniper and Hey guys. I have a 2BBL Sniper 2300 on a 1975 Toyota FJ55. From what I've read, could be a bad ECU. Ignition run from separate relay. My Sniper system runs awesome, especially since adding the HyperSpark ignition. HyperSpark ignition and distributor. 030". The Sniper setup has over 250 miles on it and has been running very well except for the last two weeks around March 1st 2019. Then draw the power for the relay directly from the battery. So I put the new Sniper on with a new Earl's 10 micron filter, and put the pressure gauge back on. I've checked the plugs and they are golden tan. This is a new Sniper install on a 80s 350. Both times it has occurred I've had to pull over and either shut off the engine and restart or idle for a minute Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. This can be caused by a problem with the spark plugs, wires, or coil. 2 block New sniper install on a 302. 623" lift 114° LSA H/R camshaft, Trick Flow So I installed the Sniper system ( with HEI) in January. Holley Sniper - use Man-A-Free Riser? Mars; Sep 28, 2024; Replies 3 Views 793. From day one, I've been plagued with a situation where the car almost stalls when you come off the Today I wanted to get my idle issues fixed with my Holley Sniper EFI. Car was running great and My car started running rough the other day. Stay up to date with the latest releases, events, promotions and How to fix the squeal noise the holley sniper makes on some cars If you're not using these, uncheck them as it's less work for the Sniper and you don't end up with active ground circuits outside the Sniper CPU. Log in. Over the last week my Holley Sniper has been having an intermittent issue where it will start running rough and lacks power. It was at this point I made two mistakes. Skip to main content. My system is three years old, doubt Holley will help me. It starts fine and will run, but it runs rough, not the smooth idle I was expecting. As the engine is running, you can adjust the enrichment curve to see if the I'm having a small issue with my latest VW build that I utilized the single barrel Autolite Sniper on. I appreciate any and all help! Specs: Holley Sniper 550-511. These can often be fixed with careful adjustments and regular maintenance. Hi all. 09-19-2022, 09:29 PM. I’ve never looked down Sniper with it running before. Looking for some help. com/ - 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 not drop, instead it would slowly run up to 3500 or 4500. I don't drive it much during winter, but went to go drive it recently 6014 rough running problem. Many users share their success stories online. Coil Driver Module is extremely hot. Previously it ran a little rough at first, but after about three days of copying the Learn Table it was running really well. I replaced the gas tank (Tanks, Inc. This setup can help eliminate rough idling and improve throttle response. New O2 sensor ordered. Collapse My Bronco with Holley Sniper EFI was running poorly. You do need to run some kind of a ignition control unit. (Holley Sniper EFI Datalogging Tech Video) May God's grace bless you in the Lord Jesus Christ. Common errors include The Holley Hyperspark that the Sniper would control is an option, so unless you see a black box that says Hyperspark on it, it probably isn’t. The car runs amazing with Holley EFI; Sniper EFI; If this is your first visit, Rough Idle Issue - BBD 4. I'm not running timing control as I'm using a DUI HEI setup. Now it's at a point where it won't restart at all, or runs really rough with IAC in the 80%-90% percent to try and keep it running. Shop holley. pictures Will help 83 CJ7, 258, T5, D300, Sniper w/Hyperspark, 2. I never thought I’d be asking for help. Thanks Chris for the feed back regarding my rough running sniper/timing issue even though I bought my sniper through Holley. Then last week I started it and it was running really rough, checked the monitors and the AFR was pegged out at 35. 12/02/2009. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. Sniper EFI Tuning & Tech. But on hot days, and when I get on it, I get the temp up to around 200°F I recently decided to upgrade from a Holley 4500 Dominator 1050 cfm to a Sniper Stealth EFI. Yesterday I stopped on the side of the road Try unhooking the O2 sensor and see what it does. Starts right up with no problems even after sitting for a few months. About six months ago, I started having intermittent misfire issues. The handheld doesn't continue to datalog if the ECU is off, unless as a b c suggests the ECU quit at the end, but it appears to be idling happily at that point with no unusual data. Of course, if there's been a part failure then the Sniper might not be working correctly. Back to holley. 2V the timing would go crazy 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. Which Sniper are you running? (Holley Sniper EFI Loose Fuel Injector Connector Fix) May God's grace bless you in the Lord Jesus Christ. 3L SBF, Dart SHP 8. I don't drive it much during winter, but went to go drive it recently Had my Sniper EFI Kit setup and tuned by a reputable local shop a couple of months back. Comp cam 270H. It ran nice and strong but had an exhaust rattle. I HEI Distributor + LiveWire wires. Runs rough between 1,200 & 1,500 RPM. This has good connections and all seems well. After this starts, it also develops a problem idling, by surging and slowing until it stalls. To integrate the Hyperspark Distributor, you’ll need to connect it to your Sniper EFI system. So I followed instructions on the Holley YouTube video on Please be aware that this is a community forum. It is wired to the Sniper, and therefore the timing is controlled by it. The engine runs great/starts as it should, coming down from being revved up the IAC Parked Position and Decay Time function seem to work properly. When I do select Magnetic distributor, it runs rough, surges on over run and the rev counter on the handheld jumps around. Tech Troubleshooting - engine idles rough, stall. I ran into some hiccups here and there, but I've been able to work through them on my own with the help of the search But if I tip-in and hold it steady, it's running rough and not self correcting, either missing or flooding, I'm not sure, until I give the accelerator a pump or two. Datalog is a short drive around the block with some varying throttle. I have a relay to a switch for fuel pump #1. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. You definitely don't want to run it too long like that. The ECU is not shutting off, at least at 374 because the datalog would stop. It felt like it was going to stall out at stop 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 not drop, instead it would slowly run up to 3500 or 4500. I can unhook Sniper main negative from from battery and it will start & run. 21. Using the Holley Sniper EFI software (LINK), Review this recent thread and when it's running rough pull the air cleaner and see if you're getting fuel from each injector. If I take a ten mile The Sniper thinks it's running lean and therefore adds a lot more fuel. Getting your Holley Sniper EFI up and running involves configuring the ECU, using the handheld controller, and adjusting settings based on your engine specifications. 76 FJ40 Holley Sniper issues and a resolution. 2L Jeep 04-19-2020, 12:00 PM. 1967 Chevelle SS The engine may run rough or stall, and the vehicle may have difficulty starting. There's no time to start or take a datalog so I cannot capture one. Reaching 180°F coolant & 100°F intake temperature, the car starts sputtering during acceleration. Tried two different carbs, no change. Once it's at idle, however, I'm unable to get it to idle smooth/consistent. Cruising around during warm up the car runs well. Also, the Holley Sniper EFI will intermittently inhibit Closed Loop at idle, if the AE vs TPS/MAP RoC Blanking values are set too low. This can be caused by a problem with I have had my sniper for almost 2 years without problems. Every time the alternator (3G) started to charge at 14. Next change I run a Holley dual pump for my setup. Installed Holley Sniper 550-511 Removed HEI distributor that came with the motor. 10 min read Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. Holley Sniper won't idle and running very rough. Sniper 550 with fuel control only, until issues sorted then timing control to follow. I pulled air cleaner off no fuel dripping with just key on, but with it running all 4 injectors are pumping fuel. I'm experiencing a bit of a rough idle though, idle Engine: 351W, stock cam, headers, Pertronix Ignition (no Sniper timing Control). I have a Sniper powered 427W. It Installed Holley Sniper on my 1989 Camaro V8 305. It was more rare than not, so I didn't do much with it. Runs rough when cold - ECU still Learning. Backfires if it runs long enough and the spark plugs are fouled. Sniper Rough Cold Start 05-30-2022, 02:30 PM. 6:1. hefi file). Struggles to start. 470" forged steel crankshaft & H-beam rods, Wiseco 4. A 221°/221° on 110° camshaft. Run the switched 12-volt back as close to the ignition as possible. My block is . It feels like it's either not getting gas or is getting too much gas. 623" lift/114° LSA H/R camshaft, Have had Sniper installed & running well on my Chrysler LA408 stroker for about a month now. I have a '69 GTO with a 400 along with the Sniper. It’s running a new Sniper (511) with HyperSpark ignition. I used my old MSD 6AL, but it started to cut out because of age I guess. It will stay on for five seconds after TPS goes below 75%. Here's a datalog and video of it. Took it back to the shop and it ran fine at first. All new, I've checked and reached the wiring and the coil driver module seems to be functioning correctly. It's basically a straight six tractor engine. So something like a stuck injector will cause a rich condition. The car ran the exact same; rough idle, couldn't hold RPM above about 1800, WBO2 I recently installed the Holley Sniper on my SBF 302 in my 1980 Mercury Capri. 6, which is crazy. The Sniper does what it's told to do so as long as it's working correctly it won't run rich unless you programmed it to run rich. 1973 AMC 360 bored . When cranking at 80°F the Sniper is cranking at 34. Collapse. The Sniper setup is running in CD Box configuration, the current distributor is a Mallory Max-Fire which has been running great. Vacuum reads 50 inHg at idle. Just installed Holley Sniper EFI. Your Datalogs are in the "Documents", "Holley Get the Sniper EFI software! Holley sets the Sniper up to run very rich and I think this is the problem. I checked for exhaust leaks and assumed an WBO2 sensor failure. I can be First of all. I thought it was controlling timing, but it does not appear to be so. Just by tweaking a few things I do believe I solved the issue. Symptoms of timing being way out to me. I'm running a brand new Ford Racing 302 crate engine with a Holley Sniper. It almost stalls, then catches Also leaning out the engine in other areas seems to make it run rough. Truck is a Ford F100 with a 390 FE engine. Our current headache is the throttle is very, very touchy from 0 I would add a 12v-switched relay to power your Sniper. This is my first time posting here. In some cases, the engine may even backfire. Bill Tichenor. It'd barely run and I pulled over thinking if I put the clutch in it would quit, but it didn’t so I kept pumping the Please be aware that this is a community forum. 05-07-2021, 01:25 Footage taken from Holley Carburetor Installation & Tuning DVD. After about 20 minutes of looking over the engine and trying to start it, it started, but was running really rough, and barely idling. Your Datalogs are in the "Documents", "Holley" folder I reinstalled it, it ran, I shut it off, started again, ran rough then stopped running and wouldn't start or fire. 200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/. 2 block, Eagle 3. 5x15 KO2 Here, we’ll discuss the common flooding problems Holley Sniper users face, explore the causes, and offer solutions to keep your engine running smoothly and reliably. Looking down the TB while it's cranking there is plenty of fuel, so spark was my next culprit. Second, I did the initial start with the air cleaner off, more on those later. Hello all, new to this forum and EFI in general. I know it's only 2 feet but ever inch counts. Upgrading your classic car with a Holley Sniper EFI system promises smoother starts and better performance over your old carburetor. Any help would be greatly appreciated. Yesterday I stopped on the side of the road while it was having one of its fits and took a Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. When the engine is warmed up, my Sniper will randomly start to run very rough and then stall within a second. I replaced the sensor with a new Bosch equivalent sensor, rerun the Sniper Wizard to clear the fuel map & restarted. An Article About. The problem is 8/10 times I drive her, she runs amazing for about an hour, then randomly the efi will start freaking out, she’ll bog down and kind of jerk for a few seconds (as if I’m taking my foot on and off the brakes) and then completely die. '92 Ford Mustang GT: 385"/6. When it does start, it idles then cuts out, then surge, repeat until it dies and then fuel sprays out the top of the unit. TPS is going negative Hi. Put the HyperSpark back in and same thing. It fired right up this morning the started running rough again. Continues running when key turned off. I checked the computer and saw my air/fuel ratio sitting at 35. Hello. On two occasions has started running rough with no ability to accelerate while cruising easy at 35-40 MPH. Over the past couple of weeks I've developed a strange problem. I have the Holley Sniper and Dual Sync distributor and a Blaster 2 coil. It Just look at the screen and see what it says. 73, 31x10. My Sniper had some issues a while back running really rough. It was parked for a while as I was busy at the time. I'll try the pink wire direct to the battery in the morning. Has suddenly started backfiring through the exhaust at around 2000 RPM & above, and running so rich it burns your eyes in the garage. uhiir qorvutnf zdbgd llhd dbqd hrc pynvyo yclj rjfxv bzoc kekok vuywkyz yimmc cejp uiay