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. With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . Cycle the ignition as instructed by the handheld and then navigate to the distributor setup screen. knowledge with the sniper efi setup. When I see that your TPS is 1%, that tells me that you may have an RFI problem. Remove the tape from the IAC breather hole and restart the engine. Going back to what you said. At idle my IAC is 3-4, AFR around 13-14, TPS is 0, timing 15-17. 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. 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. By the time I was near home, the idle in Park was 1050, IAC 0. Get On The List for Emails Straight From Our Pro? FYI: Car is a 1970 Mustang 302 Ford Racing roller motor. But once you come off the throttle there is a minimum RPM that the ECU wants to see before it releases the IAC from the park position and that is normally 1000 RPM over the target idle. Thanks. MSD pro billet and 6AL box This was an issue in the earliest version of the Sniper firmware. But nothing beats a good solid gut-check 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. 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. By going into the IAC settings and turning off the Idle Spark control and setting Target Idle to 750 RPM my idle issues are gone, and it now returns to desired idle after cruise. Thank you in advance for your help and providing us rookies with your around 45 mph it bogs down, catches itself, bogs, catches, bogs and catches. A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. Does anyone have photos of this additional return spring they installed? Simply turn the idle speed screw on the linkage in until the throttle plates open enough for the idle to increase. 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. Using a Snap-on variable timing light so this is why I say timing is perfect. It shuts off when coming to a stop sign, at any cruising speed and romdomly at idle in park but never when excelerating. I have quadruple checked my wiring and am certain it's correct. A few, however, get tangled up getting the idle control working just the way they want. Then why don't you Get On The List for Emails Straight From Our Pro? 3 different fuel pumps. Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. Top 10 Sniper EFI Installation Tips from Holley's Tom Kise Tried that and it didn't work? The data that you provide shows that you have at least two problems. I've abbreviated it just a little bit but am appreciative of the added insight your comments provided.Off-idle performance can really be a challenge to self-learn but be assured that it can almost always be done. If i adjust the throttle plate screw in to bring IAC in to proper range say around 7 the engine is running around 2000 rpm. 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. The IAC going to 30 is normal. So I have been driving it for about 400 miles now to numerous car shows and going out for cruises around town, trying to work some of the bugs out from everything we did this winter, but I notice when I take off from a stop sign or I cruise at a very low speed (say30 mph) it seems to be very boggy from no throttle to about 1/8th throttle. But there are several degrees of play there in which it should still work fine. What might cause the TPS to go to 2%? This can cause the engine to run rough and may even lead to engine damage. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. It turns out that some of the Snipers are shipping with the minus 40-degree setting drastically lower, as shown in the following image. Often, folks will say, "I did everything you said. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? (Note: in the original version of this post we had a section about checking the idle speed curve setting. I called support line he said he would have to look into it and call back. And increasing your idle via the idle screw was also a good idea, because that will lower your amount of IAC that is necessary to keep your engine at the target idle speed. I know this is old, but I bought and installed a Sniper kit in 9/18. Hopefully replacing the pump again will resolve both issuesWhoa. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. The Sniper ECU can use the timing to help maintain the idle speed and that will definitely be useful in that transition from Park/Neutral to Drive.If you don't have ECU-controlled timing, or if you do and it's not fully compensating, it may be necessary to increase your target idle slightly. We do that but most places don't. I appreciate everything you are saying. I have never seen issue when CTS is below 120 degrees. While confirming, in the handheld ensure that the Reference Angle is set to 57.5 and that the Inductive Delay is set to 100. Except at idle. Since it is unlikely that anything else changed it is most likely the IAC is problematic or the butterflies are not shut all the way. While you have over 200 miles on the system, you must realize that in the part of the map where the ECU finds itself during lanches you might only have a total of 5-10 seconds in any given cell. In the datalog the engine is running at 1400 RPM, TPS is zero, IAC is zero, CTS is 185F but it's in Open Loop. Idle IAC problems? - Holley Performance Products Forums If you do find you have RFI issues then I've written an article on solving RFI problems. These problems will go away when you do that. Then, when you experience the high idle, note if the IAC number has increased. I believe that you have this problem solved now with your new inline filter/regulator. Holley sniper, bogging/ losing power "NOW FIXED" 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. Ive played with the timing on this thing multiple times.Car was fullly restored last year. The problem I'm having is I cant get the IAC to drop down off 100%. Or ?I have put a fuel pressure gauge right at the inlet of the sniper and it is reading 60-64 psi. What you are experiencing is rather common. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Which means you either need to increase that number or increase the ramp decay time. If they are closed, check the primaries. Did your process to adjust idle to 860. Okay, try my method. So try changing your IAC hold value slightly:Tuning : Advanced : Adv. lower until I turn down the set screw. = 2.34 When I turn the key on I can hear it prime, but I don't think im getting enough fuel. He has walked me through every question Iv. I have a Holley Sniper EFI with HyperSpark ignition. :-). But after sitting static idling for a little bit, the IAC goes to 100% & stays there. Is this normal ? All times are GMT-6. An undersized or partially plugged fuel filter is a classic EFI installation mistake. It does this with the engine off. What is it supppse to be at idle and while driving under heavy acceleration? It sounds a little different from mine, since it commands a 1300 or so increase intermittently. I would continue checking the electrical connections along the fuel supply. )So before I hook up another gauge to see if the Auto Meter is bad (assuming I can find a 0-100 test gauge in my shop). Engine Startup Tuning for Sniper and Terminator X Stealth Owners >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. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. Changing the rpm curve and target rpm has no effect. The problem I believe this is creating is after I start vehicle (and its still in park), the IAC drops down to my hold percentage of 10% (since throttle % is not 0) before engine is warm and therefore causing the engine to stall out. Tuning Your Sniper EFI System for Progressive Secondary Link Use 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. Did you find this enlightening? Your closed loop compensation is adding a full 50% fuel. 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. Really appreciate the amount of learning im getting off here. Incorrect connections will result in excessive resistance. I'll have to check again tomorrow. However, I have never found that to be the case. As you have noted, each time the idle goes up. Your second problem should be a bit more concerning. There is a chance that the IAC is open but displaying 0% so start by putting your finger over the IAC opening. Plus, you can email that file to me and I can be of more help. If there is an issue with using the Sniper EFI TPS signal, is there a remote TPS or an adaptor for the Sniper EFI that allows the TPS signal to be accessed for the transmission. The last 2 times have been shorter and one time the high idle was around 1400, this time around 1100. Great work, expert! Key, I believe, in this success is solid connections, resistance-free signal and ground paths, and solid RFI rejection. Holley Sniper IAC Problem - Holley Performance Products Forums I also raised idle at Park a bit with the idle screw. issue. Running the vacuum advance and of course I time it disconnected. Short drives is fine then it'll 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. If no air is passing (and the idle doesn't drop) then your IAC is working. Hi Chris I didn't get any traction on Holley.com I am new to the EFI scene but want to learn. I put it in neutral and the idle RPM had increased to 2100-2200. holley efi. When I turn it off and try to restart it just cranks. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. 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. The last pic is with the car in Drive. When you open your IAC to 30% you are naturally going to have a high idle condition. Start engine let it warm up to 160, learn mode is learning. Hi. I don't want to go on too long here but once you know if you're trying to add or remove fuel, there are a couple of ways to go. While it is not mandatory, I recommend the Sniper EFI CAN-to-USB Adapter to move the data between your Sniper EFI and your PC rather than trying to do this via the SD card. If either of these is not the case it must be remedied.After you have done this then you might want to involve Holley Tech Support about the TPS, or it may be easier/faster just to visit the local auto parts store and pick up a new TPS and install it. Always had to set idle above 950. This will tell us if the ECU thinks that it is in control of setting the idle or if it thinks that you are driving the engine speed with the pedal. I got it home, checked it all over, everything is hooked up correctly. My IAC was constantly at 100% at idle. 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. EFI Troubleshooting EFIand and EFI Tuning Tips - In The Garage Media I did all of this before seeing the link you sent. Cracked casing from a side cover screw being installed crossed threaded. Have you confirmed your fuel pressure at idle is 60 PSI? And, hopefully, within those degrees you will find a place where you don't get the whistle. I have driven it a few times maybe 100 miles or so. If you use your handheld to go here: I have an entirely separate article on Solving RF Intereference Issues. If you have an installation or start-up issue that is nagging you then please use the comments section to reply and we will gladly provide more information that we hope will be useful to you. Idle > IAC Kick. 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. MAP Sensor. Let me start with the engine not starting until you press the throttle. If I go any more it will ping. Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. Tps is saying 26% when it at idle. In that case, and if you have an EGR valve, I might be suspicious of something going on there. It then idles up from 750 to 1100. :-). Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish The throttle plates are misaligned. Thanks for sharing that, Jason--great info! Inj. Copyright 2022 Holley Performance Products, Inc. All right reserved. However, I have what I will call a whistle at a throttle position on 35 - 50. 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. You can manually set it 57 after you run the Wizard if required. When I put it in gear, it drops so low that it will stall if I don't add throttle. 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! I believe that for the HyperSpark the Reference Angle should be 57.5. Definitely not 90. 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. 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? 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. installing and cruising down the highway 70 mph I just wonder if all I have to do Once engine is warmed up been driving for awhile. Seems to behave more better now. You'll be amazed at how much of this just "goes away" when you drive it enough. My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. To do this, open up the Initial Startup gauge screen that was used in section 17.0. Simply use your handheld controller and go to the Tuning > Advanced > Advanced Idle > Idle Speed screen and click on the Idle Speed Curve function. When the secondary throttle blades are centered in their bores and pivot freely, an additional return spring is not necessary. I notice at 2-3% tps the iac is 18-25% and it stumbles, when the iac gets to my hold position of 30 it stops. Let's start by not assuming anything. It may take a few tries. Or, at least, it should. Do please let us know what you find out! But, if the idle is so high that it is making you crazy then you might try dropping that number just a bit. With the engine still idling high park, set the brake, open the hood, and remove the air cleaner. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. 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. I've made all the adjustments, all the settings, and the IAC issue is driving me crazy. 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. TP range is normal goes up to about 90% with throttle pedal to the floor. Holley Sniper review - The good, the bad, and learn from my - StangNet Is that normal? If you get into the practice of hearing all three of these sounds you will know if you have a problem even before you turn the key to crank. No timing control, coil negative ignition type. Shut off car/restart and it's back to idle at 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. If your fuel pressure regulator has failed (and they often fail by blocking return fuel and maxing your fuel pressure) then it could lead to rich idle, particularly until your engine gets up to temp. At any rate, once the setting was moved up, the RPM jumped right to the target RPM and was solved. It sounds like you need a bit more of a fuel squirt on acceleration, Brett. Sniper EFI Problems - Holley Performance Products Forums

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