Holley sniper high idle at startup?

Today I wanted to get my idle issues fixed with my Holley Sniper EFI. The first would be a cold start, and the second would be a datalog of a "red light" scenario where you get the stall. I recently cleaned the IAC pintle. May 3, 2024 · Holley Sniper high IAC Position and low idle when cold until giving it enough gas to hit the IAC Hold Position then it works good and idles at the right spot. It cranks over about 3-4 revolutions, and fires up but surges a couple times before the idle stabilizes. 79 posts · Joined 2016 Hi there, Finally got my Chevelle out of the garage with the new engine this morning. May 26, 2024 · When my idle can go as high 1000 RPM and IAC Position will be a 0%. Occasionally the engine would die when I would pull into a stop sign. MAT (Manifold Air Temperature Sensor) – Should read ambient on a cold engine with the key on and the engine not running. You should notice that the sucking sound is more noticeable when the IAC count is high. Maybe start a datalog when the engine is idling cold and just keep the datalog running until the engine warms up and starts to surge. Within the last quarter, Holley (NYSE:HLLY) has observed the following analyst ratings: Bullish Somewhat Bullish Indifferent Somewhat Bearish. The IAC is at 100% because it is trying to meet the new idle targets. You might start by calling the local hot rod shops and trying to locate a Sniper guru in the area. Everything runs great on my Sniper kit! The only thing that bothers me is when the car is dead cold, you fire it and it immediately goes to set idle speed. Thus, if you truly plugged the IAC port, the engine should have died, unless getting air somewhere else (vacuum leak from PCV, brake booster, intake gasket). Holley Sniper EFI IAC Surge - Idle Air Control Problem FIXED! Try this before sending it back! Hey all. Then yesterday I went to start the car after sitting for a week and it would barely idle ~500-600 RPM. 2) Verify fuel pressure at the Sniper with a pressure gauge. 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. That's where it seemed happiest and made the most steady vacuum of about 7-8 inHg. Switch power to the Sniper on and crank the engine. While adjusting the idle speed screw, if the. Direct plug in and even has a longer harness. That sounds like it may be a clogged injector. 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? 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. I do have an aggressive cam installed and idle set to 800 RPM, any lower an it will sometimes die when issue starts. Then yesterday I went to start the car after sitting for a week and it would barely idle ~500-600 RPM. Aug 6, 2023 · Rumors are that the Sniper 2 resolves the RFI / EMI issues, not sure what else, but I'm not headed in that direction. The IAC is parked at 100 because this Super Sniper IAC system is too small to provide enough air at start-up for a 598 big block. Today I wanted to get my idle issues fixed with my Holley Sniper EFI. My guess is it probably giving … 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 … 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 … Rumors are that the Sniper 2 resolves the RFI / EMI issues, not sure what else, but I'm not headed in that direction. I selected stock cam in Wizard. Jan 20, 2020 · 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! Nov 17, 2022 · When it comes to troubleshooting a Holley Sniper EFI system, there are four main symptom areas to watch for: fuel delivery, ignition, air/fuel mixture, and timing. It will do this for over a minute. While adjusting the idle speed screw, if the TPS Position begins to read higher than 0%, cycling the ignition switch will recalibrate the TPS back to zero. If stay-at-home orders amid the Covid-19 cr. Direct plug in and even has a longer harness. Jan 12, 2024 · Sometimes we had issues with the idle, especially when pulling up to a stop sign it would drop to 400-500 rpm and almost die, but then it would idle. Doesn't die or anything, but no high idle. Snapped the snout off the starter today Holley Sniper with HyperSpark. Anytime you see the IAC pegged at 100% you can be fairly sure that the throttle blades need to be open a bit more. Turn engine off (remove tape). My idle was really high last week. I recently spent several days reading (books) about EFI idle tuning and improving my engine's idle quality. Everything runs great on my Sniper kit! The only thing that bothers me is when the car is dead cold, you fire it and it immediately goes to set idle speed. If you own erodible agricultural land that has been consistently cropped, you may be eligible to participate in one of several United States Department of Agriculture (USDA) progra. Problem is, it can start fine & run in idle. The IAC says 100% and this happens every time. Car drives & idles great when cold, but once it starts to heat up ~50% of the time when I coast in neutral starting around ~1500 RPM, the RPM will just drop down to stalling out smooth & quick. To start viewing messages, select the forum that you want to visit from the selection below. llation of the Sniper EFI TBI fuel injection system. I'll check with a timing light and report back as well as inspect cap/rotor, etc When I ran a carb my ignition timing with mech and vacuum advance worked out to 29° at idle. I've verified the idle timing is set at 15° advance. Unless you test it, you won't know if it actually opens. Yesterday (April 7), SpiceJet operated the country’s first “cargo-o. 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. I recently spent several days reading (books) about EFI idle tuning and improving my engine's idle quality. 050 Exhaust: 246° • Lift @ Valve Intake:. For the TPS, loosen the screws and rotate the TPS CCW or CW to get the biggest movement and tighten it back down. That sounds like it may be a clogged injector. When I start it cold, the idle stays low until I bump the accelerator, then it seems to go to a level I've set for. 1 (270) 781-9741. I have tried covering the IAC hole and adjusting the idle but even with the car off, key on the IAC is at 54%. At high elevations it could read as low as 75kPa. If the IAC was fully closed it might run 20 or 50 RPM below target idle speed, so the chances that the IAC is causing the stall are pretty slim. Startup is obsessed with ideas. Thus, if you truly plugged the IAC port, the engine should have died, unless getting air somewhere else (vacuum leak from PCV, brake booster, intake gasket). Tweet High VE% idle on a small engine. 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 the Wizard. Good start, but I won't going further before being able to test the timing. I'm working on trying to get my truck running good, but after installing the Sniper 2, I'm getting a lot of pinging when I’m more than 3/4 throttle. Searching through the threads in here led me to the EFI System Pro article "Solving Holley Sniper High Idle Issues" about the fluke -40°F setting on the Idle Speed Curve and thought for sure I'd found the issue! 7) 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 the Wizard. So ultimately if you don't have a hanging high idle condition and it runs good, you may be able to just run it. On cold startup I have to hold my foot on the throttle to keep the engine running, target idle is 1100 RPM and the actual idle is about 500 or 600. There's a very small set screw that adjusts the closed point on that shaft. It seemed to help the cold start, but it'd intermittently almost die and it would popthrough the exhaust. Sniper EFI SD Card Contents - This file contains SD Card Contents for Sniper 1 applications utilizing V2 Firmware. Sniper EFI Software. Doesn't die or anything, but no high idle. At high elevations it could read as low as 75kPa. 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 ). Yesterday, 09:01 PM I just installed a Sniper 2 into my '65 Mustang, and in general it's running fine. Once the fuel system is installed checking the fuel pressure on the inlet side of the Sniper E. Although Holley employees will take part in answering questions from time to time, your questions may or may not be answered by Holley personnel. The throttle blades need to be adjusted with the engine at operating temperature so that the IAC reads 2-8% at idle. Nothing is hanging the throttle open also. Hoping to get some help as i'm cooked! 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. You have to back the idle down on the Sniper unit itself. harvard letter of recommendation I thought it seemed high, but figured maybe that's the way it was. High Idle Issue: The truck warms up just fine and idles correctly. IAC Ramp is startup idle speed added to target idle. Everything runs great on my Sniper kit! The only thing that bothers me is when the car is dead cold, you fire it and it immediately goes to set idle speed. Tweet Hot Idle Surge. The US Supreme Court today heard arguments about juvenile justice and uniquely harsh American punishments. It sounds like your throttle cable is not returning all the way. It uses the sensors to monitor specific engine parameters and make changes to those based on the information it is receiving about the engine's operating conditions. I turned the key to start and she started right up All I did was let her run for a good 15 minutes or so, and she got up to temperature I did not touch the throttle at all until the very end of the run I depressed the throttle till above 2000 RPM and she started Learning. I have multiple datalogs, I have contacted Holley tech support and have received little to no help. Hey everyone. Sniper Teams - Sniper teams consist of two people thereby getting the most out of a sniper rifle weapon system. Today I wanted to get my idle issues fixed with my Holley Sniper EFI. It almost stalls, then catches itself, then almost stalls, etc. I took a few screen shots of it. 1970 Nova, aluminum head 355 with a big cam, Turbo 400. To start viewing messages, select the forum that you want to visit from the selection below. If you use high-powered accessories, the idling alterna. Nov 27, 2023 · Holley Sniper 2 EFI High Idle Issues (Fixed) - 454 Big Block Chevy. Holley Sniper on a 396 BBC in '62 Chevy Biscayne. Jul 30, 2022 · 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 Table (optimize ignition timing). The main issue I’m having is that during hot idle, the idle speed will sometimes surge in a regular pattern repeating every 5 to 10 seconds. Dec 13, 2016 · Turn the idle speed screw on the primaries in about 2-3 turns after it makes contact with the linkage and starts opening the primary throttle blades. Check and adjust accordingly. When you feel overwhelmed or exhausted, it can be hard to shift ge. cool math games 69 I recently cleaned the IAC pintle. There's no time to start or take a datalog so I cannot capture one. Home Make Money Side Hustles If you’. That sounds like it may be a clogged injector. By then the temp was up to around 190°, and I new the thermostat had opened up, because the radiator had gone down. At high elevations it could read as low as 75kPa. May 1, 2020 · Installed a Lokar throttle linkage bracket custom made for the Sniper, removing the old one that had been on my Holley 750. I've had it idling (not driving as I'm still finishing the rest of the car). 08-15-2022, 09:05 AM. For example, if your target idle is set to 800, you'll need to enter 400 for the "RPM Above Idle To Start Ramp" value. Problems I've found/things I've done so far: Many have had stuck injectors but that causes an insane amount of fuel. 2) The USER creates the AFR TARGETS Table that identifies the "desired" levels of AFR, that the Sniper system will perform dynamic fuel injection. Possible fix for high idle. I have reset the IAC Position three times and still fluctuates and stalls sometimes. This is a new install. To diagnose a problem, start by ruling out the simplest causes first. 01-29-2023, 01:36 PM. If the IAC doesn't respond then it is stuck or broken or there is a loose connector. May 9, 2019 · There is an idle speed setting on the handheld that is entered during the base setting under the set-up wizard. As mentioned earlier, you still need to increase the TPS and MAP RoC Blanking values up to 12 to 15%. what times does ups close 04-01-2024, 01:23 PM. Aug 31, 2021 · Hello. Apr 6, 2023 · Tweet 04-05-2023, 07:59 PM. Occasionally the engine would die when I would pull into a stop sign. Can start, won't idle. Used for high performance or larger displ. It will do this for over a minute. I replaced my carb today with a new Holley 670 street avenger, elec. When the Trooper is not idling properly, this is a maj. 5, but can’t figure out the timing. If stay-at-home orders amid the Covid-19 cr. Everything runs great on my Sniper kit! The only thing that bothers me is when the car is dead cold, you fire it and it immediately goes to set idle speed. Holley Sniper 2 EFI High Idle Issues (Fixed) - 454 Big Block Chevy. Jan 12, 2024 · Sometimes we had issues with the idle, especially when pulling up to a stop sign it would drop to 400-500 rpm and almost die, but then it would idle. This fixed the high throttle position sensor reading (TPS) of above 1% that likely caused my idle issues Sep 8, 2018 · Hot idle is now acting as shown in the video. For those who have high idle issues even after you verified you do not have vacuum leaks, RFI issues, the TPS & IAC are set correctly, may want to check your return spring on your secondary … Once started, it should have a slightly elevated initial idle, ramp down to a level appropriate to the ambient air temperature, and then continue to idle down to the target idle that you’ve established for the engine. IAC & RPM cyclically fluctuate at idle. 04-25-2021, 10:23 PM. I have tried covering the IAC hole and adjusting the idle but even with the car off, key on the IAC is at 54%. The engine runs OK when hot. I did notice that my IAC is still at 0% when coming to a stop once I start driving it. By improving your timing and leaning it out some, the idle speed may have increased and you need to turn out the idle speed screw to get the IAC back to 2% to 5% once it is fully up to temperature. Everything runs great on my Sniper kit! The only thing that bothers me is when the car is dead cold, you fire it and it immediately goes to set idle speed. May 15, 2013 · 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.