holley sniper efi iac problems

Bolt on 4150 Flange Carburetor Replacement. It may take a few tries. I have been able to get it pretty Observing the temperature on the 3.5-inch handheld (only), wait for the temperature to achieve 160 degrees F. Once above 160 degrees, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in step 1, above. Across the board, all of our customers say how impressed they were that it started and ran right out of the box just by following the simple installation instructions. After only running for about 15 minutes or so the system starts to fail stalling the motor. technical rep said "You ahve high fuel pressure". The Street/Strip and race cam setups tend to be too rich initially. Now it registers zero and I have good idle but it will not register until it hits 60 and up. Camshaft is M-6250-B303 .480 lift intake & exhaust, duration at .050 is 224 degrees for intake & exhaust. The person I bought it from said he never could get it to run for more than a few seconds. My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. It's hard to know what the previous owner did right versus wrong. So something is triggering the ECU to be in Open Loop. Thanks in advance for any advice. This is extremely unreliable afrer warm. Can the return line be an issue?So far this sounds like an ideal setup.>I have had 2 faulty gpa-4 255 walbro pumps go bad. A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. First thing I would check One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. I have a 406SBC that does most everything right with this sniper setup. It's all part of the pleasure of EFI. I readjusted my IAC, now it's perfect. Initial thought is timing but Im running a cd box and the ecu is not controlling and I did not physically change it during the install. Though they both are indications of the amount of opening through the throttle body, the TPS is the throttle opening percentage and the IAC number tells us how far the IAC stepper motor is opening the bypass air circuit.If I understand you correctly you are saying that the TPS reads somewhat normally (traveling from 9% to 100% or so) but that when you cycle the key it once again starts at 9%. Sniper EFI Initial Startup and Troubleshooting - Holley It works instantly for him.If that fixes your problem then you have a starting place. I have checked the pink wire and it is at .001 volts when key is off. Free ground shipping regardless of order size! But I wanted to go ahead and answer this so that it would make sense to someone who might not go that route.I think the first thing I'd do is try another pressure gauge. If you've been running a filter then you have to wonder if you have a legitimate Walbro pump.If you install a new pump and the noise is still coming from the Sniper EFI System then only the dealer who sold you your system can help you. Ensure all your sensors are displaying proper values. If I put the truck in park it comes down to idle. any advise would be appreciated. We can not hit it at all, we hit the pedal abruptly, the engine gives a lot of excess fuel, the AFR gets super poor at first, the car stops, then the AFR gets super rich and the car runs until it cleans up. That is a good thing.I don't have a specific target RPM but always encourage automatic transmission users to bias the idle just a tiny bit higher than what you might otherwise. Should the iac% fluctuate? That is the default "Clear Flood" TPS setting and turns all fuel off until the engine cranks. But you've got to find where air is getting into your engine.The reason it's going up as high as 2400 RPM is because once you press the throttle beyond 1% the IAC opens to the park position. Tps is saying 26% when it at idle. it will jerk and rpm will go up and down and AFR will be around 20 : 1 or more or less. Hey Tommy, we've got at least one thing in common. If you find that adding 5-10 degrees of advance helps then it's time to do reconfirm TDC. Yes its at 95lbs, needless to say he promised a new regulator would be in the I think that the more important point is that Holley kept sending him units until everything was working. Note that sometimes you can get into a back-and-forth situation. By the way your site and your accessory products are nice. Is this normal ? I know this is old, but I bought and installed a Sniper kit in 9/18. When I removed the tape and started it again, it was idling at 1400-1500 RPM and sucking a bunch of air through the IAC, even though it showed 0% on the sensors screen (pic attached). The 5-6 times it has happened now have been after the car has been running for at least 20 minutes. This value is itself enough to raise the idle a bit. As I said I didn't buy from you so you don't owe me anything. The progressive link can be a great solution on standard (non-Stealth) throttle bodies but I would install this LAST after everything else is working perfectly. If no air is passing (and the idle doesn't drop) then your IAC is working. The Tech Tips and discussions are also great! The link above includes the option to buy a -6 AN We will definitely be sticking with Holley from here on out for future retro-fits. Solving Holley Sniper High Idle Issues - EFISystemPro.com Laptop Access So I have been doing the slow take offs and thinking that it would learn its way out. Are these compatible enough? Generally, one of two things: a stuck throttle or noise on the TPS signal. I started with right after I first adjusted for 2% IAC and took pics about every 30 seconds over about 2 minutes. I.e. The Sniper resets the TPS to 0% each time that you key the system on. It then idles up from 750 to 1100. Others might require 60 RPM. (Do this while you are cranking.) Idle when warm was 850-ish and IAC 3-4 just as when I readjusted it the night before. I set it exactly like the instructions said and my iac is not only all over the place but when I finally did get it to the 2-10 range it's highlighted in red. Holley Sniper EFI If your mixture is too rich, it means there's too much fuel and not enough air. That, on top of your air leak, is allowing the engine to idle at 2400 RPM. So you installed your Holley Sniper. Chris thank you for the info. Now that you've installed at least four Snipers it is going to be imperative that you learn to create and read datalogs. When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. However, I can't think of a single one that was because of low vacuum. Chris's Idle Speed Adjustment Instructions*: *Note: If you are using your Sniper to control ignition timing then I recommend that before you start this process you disable idle spark control If you are trying to do this while the ECU is simultaneously trying to bring your idle under control by adjusting the advance it is going to be counter-productive. At this time, TPS is 0%, IAC is 50 to 60%. Look over all of your vacuum lines and fittings. When I see that your TPS is 1%, that tells me that you may have an RFI problem. But if the idle is a little bit higher then it doesn't have to jump quite as much in response to the load, and tends to react a little bit more smoothly. Next, clean the IAC and all related parts with brake cleaner. This may require shortening or lengthening a rod. With an assistant pressing the accelerator, you need to make sure that when the accelerator is pressed to WOT that the throttle blades are fully opened, and when accelerator is lifted the linkage is fully at rest against the idle speed screw. that my Air/Fuel ration was 15:1 and I believe the target is 13.5:1. Or alternator? Everything was working perfectly and I shut off the engine. 680-700.I can't find any reason other than it looses where it is in the firmware with Ultimately, it is about making the pedal softer, particularly at initial throttle opening. I recently had IAC issues identical to what you describe. So what--you're never going to drive in minus 40 degrees, right? In most cases the IAC (Idle Air Control) circuit is the source of the whistle. When I put it in gear, it drops so low that it will stall if I don't add throttle. The first thing I'd do is check your fuel pressure with a gauge like this. Sniper EFI Problems - Holley Performance Products Forums The RPM would increase for no reason. Hey Chris! To be honest, you sound like an ideal candidate for Sniper ECU ignition timing control. I have one customer who is having some similar issues and his AFR is down at 9.6:1 when it won't start. issue. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Even then, recognize that over time the IAC will need to be readjusted to compensate for minor changes that will cause it to drift. The second thing to realize is that even after you get it just right, you need to keep an eye on the IAC number and reset the idle if it gets outside the 2-8% range when idling when warm. Yes, it will talk to you--but not with words. This curve turns the idle speed down as the engine warms. Yes, let me know how that setup process works. You're going to have to clean up the wiring in your engine compartment, In particular, look for spark plug wires that might be running near your throttle position sensor. My guess is a faulty IAC since it is intermittent and I have not done any setup changes. On a cold start it will idle at 750 everytime, But if its hot start it will jump upto 1600rpm for 2 seconds then come back to 750. Duty Cycle% = 3 itself out and hold idleeventually stalling. I'm Having trouble with the Sniper on high Idle. The last pic is with the car in Drive. Again, I would lean on that solution to let the vehicle drive/learn before you try to "fix" anything. Note too that the larger the throttle stab, the more brief the time in that cell and the more gradual the change.Here's what I recommend: Get somewhere where you can repeatedly stop and go. Holley will take a look and tell you you have RFI and wish you good luck in finding it. Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. Its rare that you find someone that genuinely wants to help and see something work good, the information I have received from this page and Chris himself is top notch.1969 Dart GT 340 with a Holley Sniper, I purchased the Holley sniper from jegs wish I knew you sold them put on my truck got the IAC set haven't checked the -40 idle setting yet my problem is my headers are glowing red called Holley I think I got the worst person seemed to care less Afr is set at 12.8 for idle only thing I have changed I don't smell any fumes at idle someone said I could change the coolant temp enrichment but I don't know if it is rich or lean I figured since no smell it is lean any ideas would be appreciated thanks i have a fuel psi gauge reads 60 psi don't wanna melt my motor did not glow with a carburetor. Ensure that the secondary linkage is completely closed (both visually and manually.). Drive great and idles perfect at stop signs. When I start the motor I have to push on the accelerator pedal for the motor to start. I am new to the EFI scene but want to learn. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. I will confirm TDC with balancer but I have had balancer off and timed it before and after with same results. If the IAC number is increased during this high idle, review the points about high idle from tuning issues. (Plus they it just looks way cool in your engine compartment!) One additional wrap on the secondary coiled shaft spring is all that's necessary. Hello Chris. Thanks, That is an strange situation. I'm so glad you found this helpful--that makes my day!Don't get too concerned about the specific learn percentage. The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. Am I missing something. The throttle position should be zero. It will still change a bit with weather changes and when you get into infrequently-used sections of the map, but it's nothing to worry about.Regarding your idle speed immediately after start-up, that is determined by your Idle Parked Position. I can adjust at 160deg, but my fans turn on at 180deg. I installed the Holley gauge you suggested in another thread at the fuel input to the TBI, and the fuel pressure is constant around 64 according to the gauge.

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