That disappears as soon as the throttle is pressed and then you immediately revert to your timing table.You can certainly use the compressor to initate the IAC Kick, but remember that this is just a temporary idle boost to ensure that the engine doesn't die when the AC is first turned on. datsun sniper efi Holley RetroBright This 1974 Datsun 620 Bulletside Cruises With The Help Of Sniper EFI Bradley Iger 01/13/2023 features Latest News sweepstakes 2023 Hemi Engine Sweepstakes Gen III Hemi Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Then, when you experience the high idle, note if the IAC number has increased. Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). In the Wizard, select the stock cam setting. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. 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. The Sniper will be controlling the timing so it will be based on a multitude of factors. Could the IAC be broken/malfunctioning? Your closed loop compensation is adding a full 50% fuel. TP range is normal goes up to about 90% with throttle pedal to the floor. When I covered the IAC with my finger, the RPM dropped so low it stalled. Chris I am having a little different idle problem I did your -40 thing and that help with high idle but my problem is it idles fine until I drop it in gear and it stumbles a couple times catches up and then idles fine again. It's all part of the adventure! Cheers Darren. The problem I'm having is I cant get the IAC to drop down off 100%. If you have a bellcrank in your throttle linkage, ensure that the linkage is not engaging the bellcrank at an angle greater than 45 degrees at either end of the throw. 90% of problems, (INCLUDING MYSELF) could be answered/fixed by just reading the instructions. These problems will go away when you do that. Thank you in advance for your help and providing us rookies with your Do I have to hook up sniper ac wire to relay or should iac pick up idle? The Sniper resets the TPS to 0% each time that you key the system on. Also its extremely rich at idle. If you drop it too far the engine will stumble or stall when coming off the throttle with the car out of gear, so you'll know when you've gone too far. I have not heard of this. When the system is up and running the fuel pressure regulator inside the Sniper is making a rattling sound like a shaking a paint can. The manifold pressure increases with the throttle opening but the RPMs are still low. 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 biggest issue is these problems are intermittent meaning they do not occur all the time. 3 different fuel pumps. 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. Turning off and then on again, the engine returns to normal. When I first told him to check for leaks he looked back there and said "all good". Shut off the engine, ensure power to the Sniper is switched off. ?I never had my Carb Cold start RPM any higher then 1600 RPM.THANK YOU. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. holley efi. It is a common one. is jumping all over the place when you experience this condition, it does not and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. Copyright 2022 Holley Performance Products, Inc. All right reserved. It appears that I could now use the dongle and a laptop to custom tune for idle issues if needed. I have a feeling it's something simple but I thought I'd ask you first before I inadvertently change something that affects other areas. That changes almost instantly as the engine revs.Since the learning algorithm requires some time exposure to a certain condition to make larger changes, that half-second makes only the smallest impact. IAC percentage is 5 to 10% when idling with fans on, What you're experiencing is the delay time between the ECU sensing the additional load and the IAC actually increasing the RPM. )Since this isn't a consistent issue with all Snipers that tells me that different IAC settings tend to make the whistle. But if I take off from a stop and go to 1/4 or 1/2 throttle its fine and takes off like a banshee. That's a nice change of pace--a low idle issue! The Tech Tips and discussions are also great! 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. That is what I really respect about Holley. You can manually set it 57 after you run the Wizard if required. Thanks for the information you have provided on this site. Free ground shipping regardless of order size! It only lowers to 2-6% when I take my foot off the gas. Note that sometimes you can get into a back-and-forth situation. The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. We will definitely be sticking with Holley from here on out for future retro-fits. Wish I had bought my sniper from you, but unfortunately didnt. Member List; Calendar; Forum; Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above. And your question is very perceptive: You must first know whether the bog is a lean or a rich condition before you can make the correct adjustments. No problems with either cold or hot starts. Note that Brazilian gasoline has 27% ethyl alcohol. Has a good size camshaft cant find any vacuum leaks. The engine has 14: 1 compression ratio, we can not use gasoline. Jump on board now! 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. Thanks so much for reading! back to trying to zero down an idle. Nothing against Holley's method but I need to keep things simple and I do that by eliminating the effect of the IAC entirely while getting the idle speed adjusted. I've read that a spacer with 4 individual holes will solve this, but after I installed the progressive linkage the noise went away!! Drives just fine but won't stay running unless I keep my foot on the gas. 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 Ive played with the timing on this thing multiple times.Car was fullly restored last year. I have verified that there are no vacuum leaks, not to mention the car runs to good to have a vacuum leak bad enough to make this noise. :-). If the minus 40 degree setting is lower than the setting to the right, simply move it up so that it looks something like this: The folks who have tried this have found that their idle speed control behaves much more as they expect. And, hopefully, within those degrees you will find a place where you don't get the whistle. Yes, it will talk to you--but not with words. Yes, it will talk to you--but not with words. Handheld shows plenty of fuel so I dought it's an issue there. When you first posted this I had no idea how to respond. If no air is passing (and the idle doesn't drop) then your IAC is working. Even at 0% it's sucking a bunch of air through the IAC port. Consider adding fuel in the AE vs TPS and/or AE vs MAP ROC tables in the area where the stumble is occuring.Since this is happening at such low TPS levels it is possible that your engine would prefer a lower (richer) target AFR number at idle. You might even want to add our 4-foot extension harness that will allow you to connect/disconnect the display or CAN-to-USB adapter from inside the car (rather than trying to do that leaning over the engine and under the breather. Glad to hear that you have timing control enabled, Gary. You can drop it down and you will find it will behave more like you expect. My guess is a faulty IAC since it is intermittent and I have not done any setup changes. Start engine let it warm up to 160, learn mode is learning. Was perfect idle iac reading 3. You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. In most cases the IAC (Idle Air Control) circuit is the source of the whistle. It is how the engineers allow you to clear a flood condition when you detect it. But before you adjust the ECU to lean the idle out, first confirm that your fuel pressure is right. A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. Ilike a few othersam having idle issues. I did all of this before seeing the link you sent. The engine makes very low vacuum at idle. Its on a big block Mopar with stock electronic ignition . nothing stays steady. The engine runs beautifully, with perfect idle at 650 RPM, but every now and then I hear the IAC give a sort of "snap" and the idle is at 1200 RPM. Give us a hand! I recently detached the TP sensor from the side of the sniper to physically move it and it still would struggle to get to 0%. The last 2 times have been shorter and one time the high idle was around 1400, this time around 1100. Sometimes it sounds like it wants to crank at the start but runs out of gas. I can get it to fire up on the I pulled over and turned the car off and then back on. As inconvenient as it might seem, I'd recommend keeping a timing light handy and checking your timing during the high idle condition and then again after restarting. Then, the next time I cranked it, the idle went high and won't come down!" This is normally used as an A/C idle-up circuit. :-). This was an issue in the earliest version of the Sniper firmware. Sniper EFI Tuning & Tech. Covered the IAC port and set idle for 850 ish. Hopefully replacing the pump again will resolve both issues. Generally, one of two things: a stuck throttle or noise on the TPS signal. The TPS will go red with a -15 and the AFR reads heating for a split second, then the idle kicks up to 2000RPM. This can cause the engine to run rough and may even lead to engine damage. Your comment doesn't imply any sort of problem that would make me give up on idle timing control. Hi Chris, I have a lean stumble on throttle tip in 2-3% tps taking off from a stop light the afr will go to 19afr and the engine will stumble for a split second. The whole topic of using the Sniper TPS for transmission control is one deserving of it's own article but I'll try to summarize a bit here. If you set the RPM above idle to start ramp too high, then it may not ever get down to the RPM above idle to re-enable. You can re-enable this after you have completed this idle speed adjustment process. All EFI systems need a large fuel filter to trap dirt and yet not reduce volume. It could be, but that seems unlikely.Instead, you need to look at the basics. I'm new to the efi thing and any help would be seriously appreciated. If your mixture is too rich, it means there's too much fuel and not enough air. They also recommended that their ground be spliced into the Sniper ground as close to the Sniper as possible. first attempt but as it tries to idle down to the target RPMsit can never even applies here because it is so important to realize that just because the IAC Great work, expert! Resistance results in heat and heat results in more resistance. I recommend confirming there is no throttle linkage issue first. :-). So try changing your IAC hold value slightly:Tuning : Advanced : Adv. Definitely not 90. Also, I was seriously rich at idleso rich it hurt your eyes. Also ensure the TPS Position returns to zero at idle, & the IAC Hold Position isn't setup too high. Commanding the engine to automatically increase speed when switching into drive is a little scary to me though. But get that fuel system fixed before going any further. Perfectif you have the original synchronous linkage. Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. Did you find this enlightening? 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. With the engine still idling high park, set the brake, open the hood, and remove the air cleaner. Ok, so I'm stumped! This is very disappointing as people love to hear the motor while the hood is open.Thanks Jon. Hey Chris, I installed a Holley sniper on a small block 400, first start was great! 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 However, it is a good question so I thought I'd throw a few bits of info out there that I think might help.First, I believe that you may have a basic misunderstanding of what is being referred to sort of generically as AFR. :-DStill, I hate to leave someone hanging so I'll try to help. So what--you're never going to drive in minus 40 degrees, right? I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. I had HIGH Idle issue and fixing this curve FIXED the ISSUE --- THANK YOUCan you explain what "Current Learn % means, after finally fixing the idle problem this % jump from -1 to -30% in about 5 minutes at idle with CTS @ about 170.Also when starting the car at hot the engine goes to about 2300+ RPM for a few seconds then crashes down to my Hot idle speed of 950 -- bounces a little and then smooths out. This minimizes installation time and packages really well on a diverse group of engine applications. I appreciate everything you are saying. Maybe here will work better ?Sniper High Fuel PSIMy fuel psi is over 90 according to a brand new Auto Meter pro mechanical gauge tied in at the inlet to the Sniper using an AN adapter.I did the search function on here and found a similar high PSI issue that was fixed by clearing the return line.I have checked the return line hose for kinks and have removed it and blew thru it without any back pressure. Ive also used another snap on light to confirm. I also raised idle at Park a bit with the idle screw. Thanks. So as much as I can I have been taking off real slow and let it fall on itself to try to learn and its not learning its way out of it. If you don't have a working coolant temperature sensor then it will never bring the idle speed down. I used the Casper's Electronics 108103 splitter and carefully soldered my connections. But they are 100% committed to your satisfaction. If you remove the air cleaner entirely and the whistle continues then you can rule that out. Earl's Mechanical Fuel Pressure GaugeI could use that for a quick troubleshooting for 1/3rd the cost of the Holley one. Sorry for all the questions, new to the efi world. I keep doing that with the same result. So the issue Im having is low idle. Tps is saying 26% when it at idle.

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