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I am having an issue with the IAC on the Sniper. I'd suggest that you assume everything the previous owner did was wrong until you can prove that it was done correctly. That Hello. Again, I would lean on that solution to let the vehicle drive/learn before you try to "fix" anything. If the screen shows iac at 0 and you block the hole to find it open what does that mean? Or ?I have put a fuel pressure gauge right at the inlet of the sniper and it is reading 60-64 psi. The Sniper EFI remote IAC (Idle Air Control) and plug is designed to gain installation clearance on some Sniper EFI 2x4 installations. Turning it off and back on would reset it, and then it would work as advertised for a while. What might cause the TPS to go to 2%? The throttle plates are misaligned. If I put the truck in park it comes down to idle. Well, it sounds to me like your Sniper is doing its best to reduce your idle. If you did not rotate the distributor to set the actual timing to 15 that might be the only issue. Key, I believe, in this success is solid connections, resistance-free signal and ground paths, and solid RFI rejection. Target AFR at idle is 13.8%. But, if the idle is so high that it is making you crazy then you might try dropping that number just a bit. Engine warms up to 195 degrees and stays. 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 did check for the lightning under the hood but all was well. Is there any chance that your timing has changed since you installed your Sniper? I have checked the pink wire and it is at .001 volts when key is off. That will at least tell you something. 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. From herethe cycle continues and I am Thank you for your input. When I put it in gear, it drops so low that it will stall if I don't add throttle. Holley - 543-105 EFI Idle Air Control Motor , Black - amazon.com I'm Having trouble with the Sniper on high Idle. I had this same exact issue. When you key on, you will hear three distinct sounds: The ECU initializing the IAC, the fuel pump priming, and the injectors firing their prime shot. If the ECU has not spent some significant time learning yet, I'd recommend going back through the setup wizard and getting everything back to default. installing and cruising down the highway 70 mph I just wonder if all I have to do Hi Chris thanks in advance for any tips. If no air is passing (and the idle doesn't drop) then your IAC is working. The Tech Tips and discussions are also great! At idle my IAC is 3-4, AFR around 13-14, TPS is 0, timing 15-17. Learning to install these is great--you're about to embark on the next great adventure of advanced troubleshooting. Hello Chris. Sorry for all the questions, new to the efi world. Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. When I covered the IAC with my finger, the RPM dropped so low it stalled. Take a drive and stop somewhere for 30 minutes, CTS is 170 when engine was shutoff. In the setup, I set the hot idle for 850. Bolt-on carburetor style EFI for your classic car or truck. Reducing that a bit will help. In this short video you learn to replace the IAC. The AFR was pretty consistent around 13. If I were there in person I would test the function of the IAC (see this article.) I've been trying to correct that 1% small issue/annoyance. Even then, recognize that over time the IAC will need to be readjusted to compensate for minor changes that will cause it to drift. me know how it works for you. After this whole process, the car normally rotates without a very abrupt pedal. I have driven car about 200 miles. The Street/Strip and race cam setups tend to be too rich initially. 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. such high fuel pressure. TPS 0. We've already tried adjusting the Acceleration Enrichment chart in all ways, going up and down, RoC Blanking, everything, it has no effect. I think you will find that it will learn its way through this. I appreciate everything you are saying. Capability Range: Moderate Then why don't you Get On The List for Emails Straight From Our Pro? As I said I didn't buy from you so you don't owe me anything. 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. Physially manipulating the linkage by hand will generally reveal if you have a sticking linkage that is preventing the TPS from returning from zero. IAC is good 0-5% most of the time. Holley EFI Electronic Fuel Pressure GaugeI think its a little ridiculous that I cant see fuel pressure on the display even though its measuring it but whatever. Bolt on 4150 Flange Carburetor Replacement. :-). The 10 step set up on your page set my idle perfect and iac perfect a very consitant 700. Or is there something else I should Technically it is a warranty-voiding maneuver so proceed at your own risk. Ive tried setting the prime setting above 150 but it wont take, it always goes back to 150. I asked him a million questions and waited a long time to save up before purchasing the system and I have asked a lot of questions throughout the installation process. If you feel you have no other choice but to run a Sniper and stand-alone controller then you can give this a try. Thanks for sharing that, Jason--great info! Running a bbc with coil - my timing is perfect. sniper Installation 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! 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! 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. Also what would you say a desired idle should be for a 3 speed automatic ford? Tried that and it didn't work? Be sure to re-enable it once you get your idle tuned. Sniper EFI Initial Startup and Troubleshooting - Holley It's a Chevy 350 bored .030" over it has a cam in it what I was told is the cam has the firing order swapped. Somehow air is entering the engine that was not entering the engine when you originally set the idle speed screw. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. Hi I wish I had bought from you but I didn't find this site until now. 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. Everything was working perfectly and I shut off the engine. 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. 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. In the context of the Sniper the AFR that is being displayed is the AFR of ethanol-free gasoline based on the lambda that is being read by the AFR. If your TPS has snuck up to 2% then your IAC will be at the hold position, which by default is 30%. I will confirm TDC with balancer but I have had balancer off and timed it before and after with same results. Those little 1/8 NPT gauges are pretty inexpensive and generally pretty easy to find locally.If you confirm that the pressure is indeed 90 PSI you could pull the fuel pressure regulator apart and check it. 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. The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. I can drive it a bit but pops through the throttle body when pulling out from a stop (4 speed) and sometimes in the exhaust out on the road. (Plus they it just looks way cool in your engine compartment!) This car has never idled under 900 without stalling with 3 carbs and does the same thing with sniper edit. 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. The IAC going to 30 is normal. We are using Target AFR of 9.0: 1, Fuel Base approximately 40% higher. If you can send a data log to the vendor from who you bought your Sniper EFI System they should be willing and able to take a look and recognize RFI and then give you some ideas on solving it. If the engine will after the 4 seconds that the IAC kick drops off then it's not really going to help.At any rate, it costs you nothing to advance the ignition and see if that doesn't improve the idle, right? If I block off the iac with tape , I can get it to somewhat idle, but its not consistent. 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. Another suggestion is to add an extra turn to the spring built into the linkage to increase the closing force on the throttle shaft. You can disable the idle spark control at the locations below. IAC Creeps To 100% - Holley Performance Products Forums is train the system or there is actually something wrong.I do love the system at You can drop it down and you will find it will behave more like you expect. But I still get the iac at 0 and the rpm at 1200. To do this, open up the Initial Startup gauge screen that was used in section 17.0. To get it to idle the tps is at 2-3-4% even with linkage disconnected and a return spring installed. Cycling the power to the Sniper EFI would cure the problem, but not prevent it from coming back. Yes, it will talk to you--but not with words. Any idea's? Running the vacuum advance and of course I time it disconnected. If the solutions suggested above are not working then you need to review my article on IAC Testing Procedures. I hold my foot steady in place it does this in 5 second cycles and if i let go of Idle when warm was 850-ish and IAC 3-4 just as when I readjusted it the night before. At 0% it shouldn't be sucking any air through that port, correct? 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. The warmer the motor, the higher the idle will be at this point. If you go the other way then you might find that the IAC zero's out when the fans are off. When this happens, it is impossible to convince the Sniper ECU to allow the RPM to drop below a set RPM--regardless of what the target idle speed setting is. first attempt but as it tries to idle down to the target RPMsit can never even Start by doing the fastest start you can that doesn't bog. I would suggest you take a look at that if you haven't already. The very first thing I would do is get ground truth on your timing. Please give this a try and let us know how it works! (Note: in the original version of this post we had a section about checking the idle speed curve setting. One of the great features of Holley's Sniper is the ability to set your air/fuel ratio (AFR) where you want it. WIthout knowing quite a bit more it will be more than challenging for you to identify the problem and solve it.Fortunately, Holley provides their amazing Sniper Software. This software is going to allow you to open both the configuration file and the datalogs that you create, overlay them and you can get a much better idea of what is happening. You might have a bad O2 sensor, really bad exhaust leak or a problem with the ECU. 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. ChrisI finally got everything resolved. When I am coming to a stop, the rpms will hang at 1200-1500 rpms. Note that Brazilian gasoline has 27% ethyl alcohol. Holley Sniper review - The good, the bad, and learn from my - StangNet 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. Next, reach down into the secondaries and push the butterflies closed. And the rather cavalier "Absolutely!" Please help. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. I put sniper on in hopes to be able to just turn key and start without fumbling with pedal to keep it going and to correct idle drop when ac kicks on. After pumping the pedal a few times at different times it dropped to zero and started to work. In fact, it is those users who seem to end up most impressed with the system. that my Air/Fuel ration was 15:1 and I believe the target is 13.5:1. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. The answer will divide the possible sources of additional air into two, greatly simplifying the problem.If the IAC number has not increased, then review the article above regarding high idle from a vacuum leak or high idle from sticking linkage. The headache is the Acceleration Enrichment. Ensure all your sensors are displaying proper values. I keep doing that with the same result. I am having an idle issue (other than that is absolutely perfect). Keep in mind that at 60 miles the This curve runs fom -40 degrees to 260 degrees, and gradually reduces the RPM along that range. Sniper EFI Initial Startup and Troubleshooting Staff Writer 01/20/2020 How To Adjust Iac On Holley Sniper Shut off the engine, ensure power to the Sniper is switched off. Idle was back to normal but iac was at 0. When I shut it off then start it If I keep the rpm's up it does fine but my clutch can't keep up with this for long.Also when I cover the IAC port the engine dies. A good example of why it's so important to run a good pre filter in the fuel line. Any ideas here? Chris, I recently installed my Sniper and have an intermittent idle problem. The only other thing I changed was accel enrich but whatever way I go doesn't seem to change anything unless I change it drastically. It will learn the fueling eventually either way, it's just that one might get you there a little faster.If the idle is fine at start-up but then increases after you depress the throttle then you might need to lower your IAC Hold Position a bit. I can get it to fire up on the mean that the IAC is causing it. I can adjust at 160deg, but my fans turn on at 180deg. Overview. But I can tell you that for most people who try this it introduces so much RFI onto the Sniper that it never works right. My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. One of them might be faulty. when things aren't working and this provides just that. The Sniper will be controlling the timing so it will be based on a multitude of factors. At that point the tps is pretty high, then shut the ignition off, pull the tape restart the engine and idle goes into hold mode and idle is through the roof. Fortunately, I have an article that goes into this in some detail. So try changing your IAC hold value slightly:Tuning : Advanced : Adv. normal city driving, I no longer have other problems I had with the original In the Wizard, select the stock cam setting. If I go any more it will ping. Then do it just a bit faster--just enough for it to bog a bit. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. Once you have done this the challenge is to create a datalog that includes the ":snap" you describe. Hopefully replacing the pump again will resolve both issuesWhoa. The engine makes very low vacuum at idle. 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. No matter what do, my idle will not drop below 1350-1400 RPM when the engine warms. At that point, with 90 PSI of fuel, the ECU can't turn the duty cycle down low enough to idle properly. This will let you know at a glance if something is going awry with the fuel pump. Once you've done this, the next natural step is to transfer the learn table to the base map, then go in and smooth out the sharp edges, which are going to be at these transitional states.