holley sniper efi iac problems

I have double checked everythingincluding fuel pressureand have followed the directions to a T.I plan on trying your 10 step process as soon as I get a chance. It's hard to know what the previous owner did right versus wrong. I have not heard of this. Why is this? The IAC should display a 2-8% to bring the idle up to the actual target. Hello Chris. If your TPS has snuck up to 2% then your IAC will be at the hold position, which by default is 30%. Drop the IAC parked position a bit at each temperature point and sort of back into the solution. Did your process to adjust idle to 860. He said they have been having an issue with these lately. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. What could be the cause? normal city driving, I no longer have other problems I had with the original If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Advanced throttle body injection systems capable of transmission control and more. If I go any more it will ping. If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. It's the same one that Holley puts in their Sniper Master Kits and I've never heard anyone with anything but good things to say about it. From herethe cycle continues and I am And, while that is happening, make a note of the temperature before you engage the starter, and then the rpm when it starts.The Idle Parked Position is set on a temperature-based graph like the Idle Speed Curve. )Since this isn't a consistent issue with all Snipers that tells me that different IAC settings tend to make the whistle. Then a little faster--until bogs at that level work themselves out. My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. Thanks for the information you have provided on this site. What might cause the TPS to go to 2%? A question I cannot get a 100% answer on is can you piggy back off the Sniper EFI TPS for an electronic transmission? Only in the unlikely event that your engine simply won't run well enough to drive and self-learn should you consider tweaking anything inside of the first several hundred miles. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. This is normally used as an A/C idle-up circuit. That initial rev is going to be determined by your IAC Park Position. Sometimes it sounds like it wants to crank at the start but runs out of gas. The Sniper EFI replacement throttle body for Autolite 1100 carburetors will be right at home on most early in-line 6 cylinder powered grocery getters or weekend cruisers. back upthe RPMs shoot up to anywhere between 1500 and 2000 and they will not get My problem is low idle. :-). But they are 100% committed to your satisfaction. Idle was around 1000 mark and iac 0. Between the kick down and the return springs on the throttle body the pedal is so hard to push it's pretty much a jack rabbit start every time from stop, it's almost undrivable, any suggestions on what I could do?thanks for help, I've tried both Holley's tech lines for close to 2 hours with no answer! Also, I was seriously rich at idleso rich it hurt your eyes. Camshaft is M-6250-B303 .480 lift intake & exhaust, duration at .050 is 224 degrees for intake & exhaust. I drove it a bunch more yesterday afternoon/evening and the same thing happened several times. It works instantly for him.If that fixes your problem then you have a starting place. is jumping all over the place when you experience this condition, it does not when things aren't working and this provides just that. technical rep said "You ahve high fuel pressure". It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. I did buy the Sniper from you guys and the service was fantastic. If you don't have a working coolant temperature sensor then it will never bring the idle speed down. These problems will go away when you do that. If I try and get the 2-10% i get all the way up to 1200 rpm. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. We'll also be contacting you for future purchases now that I've discovered you! Also when ac kicks on it will idle down and stall. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. The fix? It is reliant on the data acquired by the included wideband oxygen sensor. If it is already adding fuel, it may be worth expanding this into the area where the tip-in is occuring (and where there is no learning occuring. As I would slow down for a stop sign or stop light, the car would run really rough and the idle did not want to come down. I have now determined with the TPS the noise correlates with the opening of the secondary butterflies. Any suggestions would be appreciated. Please let us know how this works out for you! I am at the point where I almost insist that every Sniper EFI System owner purchase one of these. Common killers: No filter in front of the pump, reverse wiring, driving with PWM voltage, running at dead-head pressure.Since it sounds like your pressure is right, and since the Holley system doesn't provide a PWM voltage, that pretty much rules out everything but the lack of a filter. Thanks for any info./insight you can provide, Mark. If you haven't confirmed that they it is worth checking. Overview. Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. 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. Ultimately, it is about making the pedal softer, particularly at initial throttle opening. First, I'm kind of insistent about not changing any of the default settings unless the vehicle absolutely will not cooperate enough to drive/learn, and only then if you have a specific understanding of the problem and a specific solution. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . There are two ways to address this--you can let the system learn or you can manually adjust the acceleration enrichment. The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. To finish, I rather tightly twisted the TPS signal and ground wires all the way from the controller to the Sniper TPS and very carefully routed them away from sources of RFI. It starts cold fine, its just when its hot. Give that a go and see if you don't make some progress! If you haven't installed a Is there any chance that your timing has changed since you installed your Sniper? It may take a few tries. Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. So, if pressing the throttle is making it start, it's because you're flooded.Which is consistent with your rich idle condition comment, right? 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. But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. My sniper is doing two thingsFirst issue, the idle is set at 800 and will idle fine, then There is a glitch in the system. I recently bought the car with the EFI system on it. Note that sometimes you can get into a back-and-forth situation. Shut off the engine, ensure power to the Sniper is switched off. I have quadruple checked my wiring and am certain it's correct. Using the handheld, navigate to Tuning > Basic > Basic Idle and ensure your target idle speed is set to the RPM you desire. = 2.34 SNIPER EFI TO HOLLEY DUAL SYNC HARNESS Part# 558-493 $34.44 Qty: Add To Cart Idle Air Control Motor Replacement Idle Air Control (IAC) Motor for Sniper EFI TBI Systems, Sniper 90/92/102mm Throttle Bodies, Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950 & Digital Pro-Jection Systems Part# 543-105 $71.72 Qty: Add To Cart Seems to be working. The jack-rabbit start can usually be minimized by adjusting the throttle linkage. 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. Solution #1 Put car in gear take off and the engine runs GREAT, no issues drive for 10minutes take car out of gear and engine idles correctly IAC between 2 and 5 Solution #2 Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. Suddenly, the engine accelerates alone, hears a great deal of air being sucked in, Thank you for any advice. I have it set at 650 and it idles anywhere from 590 to 700. I put it in neutral and the idle RPM had increased to 2100-2200. Cracked casing from a side cover screw being installed crossed threaded. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. If you complete the process and find that the IAC is less than 2% at idle, repeat the process and use the set screw to make the RPM about 60 RPM below the target. I keep doing that with the same result. It sounds a little different from mine, since it commands a 1300 or so increase intermittently. Thank you chris for for getting back to me on this matter.I'm using russell hi pressure gas line to feed the gas up to the sniper and using the stock steel gas line that use to be the feed line for the carb to return the gas to the tank. Was perfect idle iac reading 3. Until the engine starts, the throttle only has one purpose: To detect you pressing it to 60%, at which point it shuts off the fuel injectors. mail today. Since that has long been corrected we have moved that information to the bottom of the article.). When you open your IAC to 30% you are naturally going to have a high idle condition. I would recommend that you call first thing in the morning, as they tend to get quite busy during the day and wait times can get long. In the time it takes to add your email address you can be at the top of the heap for getting the latest information from our authority. itself out and hold idleeventually stalling. Car was running great initially. I didn't find your site until I was having trouble. If the engine idles at 750 RPM with the throttle plates all the way closed and the IAC at zero then there is some sort of an issue.

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