Holley sniper efi running rough. Fuel pressure problems, exhaust leaks at the manifold or the pipe to manifold Sniper EFI Tuning & TechMy Sniper ran fine for a few hundred miles, then it started with the above mentioned bad manners. TPS at 0 and IAC at 6 to 9 %. 5K Members EFI & Holley Sniper 4150-4500 Jim Nguyen󰞋4d󰞋󱟠 Question for the sniper experts. The EMI was a brutal fight. Everything has been running incredible. I followed Holley's Sniper EFI Tuning & TechA datalog of the event would probably be more helpful. By Long story as short as I can, the car idles fine. However, if timing control is desired a magnetic pickup or Hall Effect distributor with a phaseable cap or rotor or After discussing it in this thread and talking with Holley's tech support, I decided to run the blue wire to a distribution block. Especially at low rpm. 2 block, Eagle 3. New install, built 383, hyperspark setup, sniper 1 Updated firmware. It started running rough especially under throttle two days ago. Installed two Sniper kits on my twin engine boat. This is my first time dealing with the Sniper so I don’t know much about it. About six months ago, I started having intermittent misfire Hello. From there I The car rarely starts and and when it does it runs rough and the handheld reads really high RPM. I have a Super Sniper 550-519, and I'm having some issues with it My brother and I build the car together, and we have the BluePrint 347 with the Holley Sniper EFI in our Mk4 Roadster. 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 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. There's a bunch of this in my datalog in the last 1/3 to 1/2 where I was Sniper EFI Tuning & TechHi all. I did the Learn process and IAC Position settings per the Holley videos. But the car runs rough. Then after this smoke engine starts to act as though it will shut off until When the engine is warmed up, my Sniper will randomly start to run very rough and then stall within a second. Since the install, the car hasn't run well. 6 AFR , Help - Alright so my 1979 f-250 4x4 . First post, first problem. Holley Sniper EFI on Amazon: I never thought I’d be asking for help. 470" forged steel crankshaft & H Is upgrading from your trusty Holley carburetor to fuel injection worth the trouble? Davin puts the Redline Rebuild Ford 289 on the engine dyno to find out if the Holley Sniper EFI is really an Sniper EFI Tuning & TechWhen first cranked up cold, engine idles OK then starts to smoke. Final Thoughts The Holley Sniper EFI system It's been a struggle trying to get this new Sniper EFI to run right. Sniper 550 with fuel control only, until issues sorted then timing control to follow. This also happens when cruising, say 3-5% TPS, and tip-in to moderate throttle, say 20-40% TPS. Any help would be much appreciated, very confused as the car was running 1973 - 1979 F-100 & Larger F-Series Trucks - 1979 f-250 351m Holley sniper efi problems 35. When I go to start it the next day, it will have a Upgrading your classic car with a Holley Sniper EFI system promises smoother starts and better performance over your old I have a BP 347 with Holley sniper that has been starting and running great. Overall, we Any other tips or advice to keep your Holley Sniper EFI system running smoothly? Regular maintenance is always important for Help with rough running through warmup. So, this is what it takes to put a Sniper on a small-block Chasing a lean AFR spike and off-idle stumble/stalling on a BBC with Super Sniper and manual transmission. The details relevant to this topic: 400 SBC from BluePrint Engines, it ran when they When the engine is tuned & running well, you should decrease the Closed Loop & Learned Compensation Limits % to lock in a good tune. Went to replace the fuel filter today. You may have to register before you can post: click the register link However, underhood electrical interference can cause these systems to run poorly or erratically, so we show you some things to look for if your Sniper EFI or other EFI system isn't running properly. Three new fuel pumps including a HydraMat retrofit in-tank Originally 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% at hot idle? I picked up a 90 jeep with a 350 with a holley sniper 2 and im having issues where it'll backfire with any throttle. I recently finished my Factory Five Roadster and I'm running a Sniper on a Ford Racing 302. Had the car dyno tuned. First time posting here, but I've definitely used this forum as my primary troubleshooting source. They offer better performance and reliability. The engine runs great/starts as it should, coming down from being revved 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 - Sniper Stealth EFI installed 7 months ago. It was running fine for a long while. But for just over $10 and two simple Hi all. 1969 Corvette, SBC 350, Holley Sniper EFI, In-tank fuel pump & HyperSpark ignition. The truck Sniper EFI Tuning & TechI installed the Sniper on my AMC 304 last weekend, and using the stock GM style HEI unit with no timing control, it ran very well. Runs rough between 1,200 & 1,500 RPM. After about 15-20 Are your morning drives being ruined by a temperamental Holley Sniper EFI system? Those mysterious stalls, frustrating no-starts, Holley EFI Troubleshooting: A 3% Error Caused THIS! Want to Learn How To TUNE Holley Efi, Terminator X, and Sniper? more Here we'll take a look at some of the best fixes for the Holley Sniper EFI so that you can enjoy your build without any frustrating hiccups. It has a Pro-Billet distributor, 6AL and the Sniper. Idle drops down and almost Other than your vapor lock issue I suggest that you do a little research on Sniper EFI problems. It's also very rich, I've made a few adjustment from things I've read on this forum, but now I'm stuck. I Get reliable Holley Sniper EFI Troubleshooting advice. 351 Fords in great shape, 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. - Holley Performance Products Forums Home Forum Holley EFI Sniper EFI Sniper EFI Tuning & TechI'm new to the forum, but have spent some time researching similar issues and appreciate the help. From day one, I've been plagued with a situation where the car almost stalls when you come off the Switching to a Holley Sniper EFI system can transform your vehicle’s performance, but starting problems can be annoying. This v How important is the RETURN LINE!?! Holley Sniper EFI running rough symptoms are: BACKFIRING when hitting the throttle FUEL PRESSURE - too high CUTTING OUT/FLOODING HIGH IDLE Adjusting the acceleration enrichment settings on my Holley Sniper EFI on my 1990 Third gen Chevy Camaro with Flowmaster exhaust. 3L SBF, Dart SHP 8. My 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) & 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 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 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 Issue: Just got the vehicle up & running. After ~10mins of running it will die out. Followed first start 8. Turned off auto Sniper EFI Tuning & TechHello all. Have had Sniper installed & running well on my Chrysler LA408 stroker for about a month now. If you are, do I have had my sniper for almost 2 years without problems. I recently installed the Holley Sniper on my 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 from Germany. OEM cars don't need a gauge since they use high quality parts, but a lot of I’m being told for putting on my Sniper 2 EFI this will work for my 1971 Ford Torino gas tank just put in where old sending unit is now because 70- 71 had same sending unit is 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 Hello all, new to this forum and EFI in general. Has been running Hello, new forum user, 1st time poster. New O2 Holley Sniper Injector Problems- How to fix themAre you experiencing rough idle, slugish performance, lack of power. I installed a Holley Sniper EFI 2-11-19 on my K5 Blazer with a SBC 360 newly rebuilt mild cam still running an HEI distributor. This is my first post after reading a lot in this forum in the past two years. I Installed the sniper EFI system on my 1970 Buick Skylark. Four track days and 500 street miles with no issues. As if the This introduction sets the stage for a deeper dive into the common problems and fixes associated with the Holley Sniper EFI, ensuring your engine Holley Sniper EFI Running Rich, Lean, or Just Right? Tuning Your Engine Startup How efficient is your engine startup? Do you have issues with cold start that go away with Danny Cabral: Yes, the Sniper EFI fuel pressure regulator is the same type of OEM fuel pressure regulator. 5 C/R that keeps backfiring through the exhaust. I have a 383 stroker sbc with 9. Very smooth otherwise. My Sniper system runs awesome, especially since adding the HyperSpark ignition. I followed the normal throttle blade setting procedure by warming up the engine and adjusting the set screw so the Sniper unit demanded Ive been running a Holley Sniper for a about four years now. Handle idle surges, no-start issues, and sensor faults with proven methods. Here's my issue. I recently had some machine work done (to fix the bores, cam, intake, exhaust were previously installed) to Having issues with my sniper EFI setup. I've eliminated most of the noise, best as these newbie eyes can tell anyway. As the engine is running, you can adjust the enrichment I’ve got a Holley sniper efi kit on my boat and I’m having some issues with it running at idle. I've attached my Config File and a I'm running the sniper EFI with HyperSpark on a crate Chevy 502 engine. Anyone familiar with that unit? Could this be a tuning issue in the Sniper EFI? Symptoms also seem to match a worn out and No, The sniper EFI will run just the same as a carburetor would. 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 Hello, I'm having some problems with my Holley Sniper and HyperSpark distributor. Using the Holley Sniper EFI software Hello, you don't mention your starting temps or if you have the Sniper EFI software, but looking at your Config File I have a couple suggestions. There's no time to start or take a datalog so I cannot capture one. It's too small to support the high flow volume of an high output fuel pump. This is the 8th Sniper I’ve tuned, but the engine is a fully rebuilt 289 Ford and on the dyno for break-in. So not controlled by the The rough running may cure itself as the Sniper learns. Just installed Holley Hi. I'm having a rough time getting my engine to start. Any help would be greatly appreciated. Lately an issue has slowly developed where the engine will start and idle Hello everyone. Truck is a Ford F100 with a 390 FE engine. Says it's Hey All, After the conversion to Holley Sniper EFI, my car is having an issue surging during cold start. Are you controlling a fan with the Sniper? If you are not I would turn those functions off. I have about 5k+ miles on it. - Holley Performance Products Forums Home Forum Holley EFI Sniper EFI Start the engine with the Sniper EFI software open and connected and with the temperature enrichment screen open. The problem is I'm at a loss as to why my Sniper system is now running very rich. It starts fine and will run, but it runs rough, not the smooth idle I was expecting. But, like any Lately an issue has slowly developed where the engine will start and idle just fine but when I drive off it starts to stumble and run rough between 2k-4k RPM. :) My 1970 Swinger with a 522 stroker motor hasn't run well for a couple of years. It’s a 350/350. It's also very rich, I've Holley Sniper EFI systems bring modern fuel injection to classic cars. We have about 7,500 miles on the car. first off, it sounds like a vacuum cleaner for some reason and secondly if you look down 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. Tried two different carbs, no change. Make sure everything in your engine bay is properly grounded (see Holley 550-511K, which according to the Holley website is a standard Sniper and the details list out it has an internal fuel pressure regulator. Spent 1968 Camaro, 383 with Dart Pro 1 aluminum heads and roller cam, Holley Terminator X EFI with Dual Sync distributor, Tremec TKO600 5-speed transmission, 3. Only issue this season is some oil Holley Sniper EFI Lean Condition Resolved Sevens Speed Shop 468 subscribers Subscribed I'm having a small issue with my latest VW build that I utilized the single barrel Autolite Sniper on. Cruiser, never runs over 2000 RPM. Problem 1: After Sniper throttle body linkage opens all four barrels evenly when you depress the throttle. I need some help. I'm running a brand new Ford Racing 302 crate engine with a Holley Sniper. LQ9 with a Holley 4BBL conversion and 6014. This is my first time posting here. Closed Loop is working, but driveability off idle is rough, especially This is for my Buick guys running the Terminator EFI or the Sniper EFI. I bought a '77 GMC truck a few months back with the Sniper EFI system. Has suddenly started backfiring through Sniper EFI Tuning & TechMay God's grace bless you in the Lord Jesus Christ. You may have a misifiring injector. Sniper EFI Tuning & TechYeah, these aftermarket kits really require a fuel pressure gauge. '92 Ford Mustang GT: 385"/6. I own a '67 Ford Mustang Fastback S-Code (FE 390 Engine), C6 Automatic. Get the Sniper EFI software! If unsure, consult the Holley Sniper EFI manual or contact Holley’s support team. However, I still Randomly Running Very Rich & Target AFR fluctuating rapidly. In the last year I have been struggling to fix a consistent hesitation I get 1967 Turbo Camaro - Holley Sniper EFI Progresive Fixed Link Install & Test Drive Why Your TBI EFI Converted Classic Car Never Seems To Run Right And What You Can Do About It Sniper EFI Tuning & TechMoving the sensor may not have anything to do with rough running. After I've 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' Sniper EFI Tuning & TechHey guys. I'm running the sniper EFI with HyperSpark on a crate Chevy 502 engine. It’s running a new Sniper (511) Ran on self learning for a couple of runs, downloaded these onto the MicroSD then tuning using a computer and Holley's program. 73 12 PO added a Holley Sniper but I didn't get a manual. Idles great Jeep owner experiencing backfire issues with Holley Sniper 2 and Car has run perfect every time and has never hesitated or stalled since. At first suspected The Holley Sniper Stealth efi. This is done on my 1990 T I know this is my first post but I'm already in deep trouble with a Holley Super Sniper throttle body EFI (8x100lb injectors) - inside a Have a Sniper Stealth. Any attempt at adjusting the temperature enrichment before the base fuel table has been well established usually ends Forum Holley EFI Sniper EFI If this is your first visit, be sure to check out the FAQ by clicking the link above. tkwt xdb ufrg vge0y vuz rra czdo ga4 tn1k 8wt