So you installed your Holley Sniper. (Don't drive and watch--get a helper!) Anyway I have a 327 sbc in a 1987 Monte SS with a T5 5 speed and 3:73 posi rear. Holley Sniper IAC Surging???? But, whether your vendor provides you with tech support or sends you to Holley, I'd start by getting them a data log and asking for some insight. The IAC is hanging open and not really at 0. Ilike a few othersam having idle issues. That is not the way to go. Coming home from work today it was much warmer and took a little longer due to traffic. Always had to set idle above 950. But another thing to consider is adjusting your target A/F ratio. By the time I was near home, the idle in Park was 1050, IAC 0. He is able to get it to start by quickly depressing the accelerator to at least 60% and releasing. If you patiently adjust this over the course of days you will get it just right.Again, glad this is working for you and look forward to a good report in the future! EFI System Pro had everything I needed for my EFI upgrade. The window you saw in the image above pops up. Thanks for any help. MAP Sensor. If the IAC number is increased during this high idle, review the points about high idle from tuning issues. 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? So I had my Idle set up perfect, with idle timing control off and engine hot the IAC was right at 2-4%. If the TPS is 1% or below then the ECU is in control--2% or greater and the ECU thinks you've got it under control. Free ground shipping regardless of order size! As soon as I got the new one installed and wiredit fired right up and did everything it was suppose to do with no issues. The resulting resistance can burn up fuel pumps, wiring and relays. I'm thinking it could be the fuel pressure--- since I have a new Spectra EFI tank and there's been some reports of the interior coating coming off and gumming up the pump however the sniper display DOES NOT show fuel pressure.the Sniper DOES measure fuel pressure on its own - i've confirmed that with holley techs as they told me to purchase the fuel pressure gauge that can just hook up to the 1 wire gauge harness from the Sniper. Comp. I then saw you guys have an awesome little gauge that can hookup inline to the snipers existing fuel feed?? However, I did have another fellow who contacted me that claims he went through three units before he could get one that would talk between the ECU and the Monitor. Do I have to hook up sniper ac wire to relay or should iac pick up idle? Both Sniper and trans controller grounds were direct to the battery ground, as they should be. The ticking is inline with the fuel pressure I feel squeezing both the fuel return & delivery lines (like a heartbeat). Good luck! This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 In addition to avoiding this particular problem, the total solution is much better. Cl. I installed another return spring for the rear plates problem solved instantly. Any suggestions would be appreciated. This page was generated at 12:26 AM. Really appreciate the amount of learning im getting off here. That will happen occasionally, but less as time goes and on and the engine tune stabilizes. You have to remove all hoses in order to debug the problem. 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. One of the best Ive seen so far. 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. Definitely would have went with you guys. Or ?I have put a fuel pressure gauge right at the inlet of the sniper and it is reading 60-64 psi. After the start process, If the idle speed is higher than the target idle then the IAC should begin closing as long as the TPS is below 2%. My issue is that when Im in stop and go traffic, I can let off the clutch and the engine revs and doesnt quite want to come back to idle. At 0% it shouldn't be sucking any air through that port, correct? These will fix the noise but if the performance is suffering then likely you won't see any difference since it is not likely to be related to this sound. Great work, expert! When I shut it off then start it Do please let us know what you find out! I readjusted my IAC, now it's perfect. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. But now that Terminator X is available, I highly recommend going that route. This can cause the engine to run rough and may even lead to engine damage. I have an adapter on the manifold for squarebore to spreadbore and then a phenolic spacer. My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. any advise would be appreciated. I've tried repeatedly re-creating the scenario in hopes that the E.C.M. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. This only happens when coming to a stop and the idle is ramping down to the set idle RPM. Engine warms up to 195 degrees and stays. The Sniper even has a feature that allows it to use the idle timing to control the idle speed. If the IAC is zero, and if putting your finger over the IAC port doesn't lower it, then it's not the IAC circuit. If the regulator is working correctly and there is no restriction in the return line that should make no difference however.Sorry I didn't see this on the Holley forum. It is reliant on the data acquired by the included wideband oxygen sensor. :-). Turned it off and on again. You can re-enable this after you have completed this idle speed adjustment process. That will at least tell you something. When I covered the IAC with my finger, the RPM dropped so low it stalled. Key, I believe, in this success is solid connections, resistance-free signal and ground paths, and solid RFI rejection. What should I be looking at to calm this down? I did check for the lightning under the hood but all was well. During after-start idle, the idle will jump up to about 70% if the engine is cold, stay there about 4 seconds and then ramp down to the target idle speed for the current engine temperature. That is not a huge problem but it just means the IAC has no ability to lower the idle beyond what it is running at that point. It could be a couple of things. The fix? Any suggestions? I think that a great number of the challenges that Sniper EFI System Owners face are brought on themselves by getting into the control settings before the system has really had a chance to learn. Ensure there isn't a vacuum leak causing the IAC Position to drop to 0%. Some suggestions: i did have the same problem.try lengthening the lever of the throttle.meaning the length from the center of the throttle to the point where you attach your cable or your rod from the peddle. I'd recommend you contact Holley Tech support to get their input (1-866-464-6553; call early for the shortest wait times.) ps. Cheers Darren. Seems like its too slow to grab idle when ac kicks on. Holley Idle Air Control Motor Idle Air Control Motor Fits the Following Applications: Sniper EFI 90 mm, 92 mm, 102 mm Throttle Bodies Digital Pro-Jection Systems Avenger 4-bbl TBI Commander 950 Terminator TBI However I do have a couple of issues I hope you can help me resolve. If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. Idle was back to normal but iac was at 0. They tell you to ask call Holley. idle at 1100 on the "stock" file it's better with street strip.The IAC counts will be at zero. installing and cruising down the highway 70 mph I just wonder if all I have to do It's not necessary to drive it that way. Your task will be to find that. I started with right after I first adjusted for 2% IAC and took pics about every 30 seconds over about 2 minutes. If I put the truck in neutral the TPMS will raise all the way up over 2000. Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. Is this an issue to worry about? If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. other things that might cause the idle to faulter, but this is a good start. MSD pro billet and 6AL box This car has never idled under 900 without stalling with 3 carbs and does the same thing with sniper edit. There are a few tell-tale signs that can help you diagnose the problem. I used the Casper's Electronics 108103 splitter and carefully soldered my connections. The very first thing I would do is get ground truth on your timing. EFI parts, including the throttle body, and the problem persists.Please give me a hand. Should i adjust idle screw with the fans already on? Did your process to adjust idle to 860. There are two ways to address this--you can let the system learn or you can manually adjust the acceleration enrichment. I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. Is this normal ? I recommend you have a look:https://www.efisystempro.com/efi-pro-hangout/holley-sniper-efi-instruction/solving-sniper-rfi-problems, I recently purchased your fixed linkage to open primaries first and the throttle linkage extender to also get a smoother pedal. What must remain foremost in your mind is that the only thing that can cause the idle to increase is additional air getting into the engine. that my Air/Fuel ration was 15:1 and I believe the target is 13.5:1. After much diagnosis, I ended up replacing the intake manifold gaskets. They also worked with me on a sale I missed and price matched those parts. Ensure that the secondary linkage is completely closed (both visually and manually.). My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. Make sure that your blanking level is _below_ that (being careful not to find yourself in the situation I describe above.) Car was running great initially. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. technical rep said "You ahve high fuel pressure". Have a look--I think this is going to allow you to fix your idle problem. Plus, you can email that file to me and I can be of more help. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. My car will not idle right until it gets to around 130 -140 degrees. Kind of cuts into forum time. The Sniper Quick-Start Manual provides the following instructions for setting the idle. If I'm driving along and pull up to a light and leave it in gear it idles just fine but it seems not to be able to compensate if I put it in neutral and then back and drive. I haven't driven it for the 30-40 minutes like the several times it idled at 2200. No timing control, coil negative ignition type. Holley Sniper EFI Troubleshooting Mudford Garage 8.6K subscribers 38K views 3 years ago My Bronco with Holley Sniper EFI was running poorly. I received from the controller manufacturer greatly understates (at best) the repeated failures of others I know personally who have tried and failed. I would suggest you take a look at that if you haven't already. If Now that you've installed at least four Snipers it is going to be imperative that you learn to create and read datalogs. I have replaced the IAC motor and the problem remains. 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. Idle : IAC Rampdown : IAC hold positionChange this by maybe 2% in either direction. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. When I start the motor I have to push on the accelerator pedal for the motor to start. I got it home, checked it all over, everything is hooked up correctly. I did all of this before seeing the link you sent.