And since they really had an insanely-tight monetary and real estate budget in the Sniper EFI System, it is unlikely that the added something that wasn't absolutely necessary--and then forgot to use it..And you are spot on about the little Earl's gauge with optional -6 AN port. 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. AGAIN This is Intermittent meaning on a recent trip I stopped 3 times and issued occurred once. Second, Holley just released over the weekend a video on how to implement a flex fuel sensor on their HP and Dominator ECU's. That is certainly not normal! That, on top of your air leak, is allowing the engine to idle at 2400 RPM. 34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. I'd really appreciate some help. I will turn it up some more.Is this something that the ECU will learn? I did read some comments on regulator issues is there a way to check it for an issue ? Jump on board now! So check that timing and I think that you're going to find you need a good bit of advance. To start viewing messages, select the forum that you want to visit from the selection below. no timing control. At 0% it shouldn't be sucking any air through that port, correct? 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. It starts cold fine, its just when its hot. However, I can't think of a single one that was because of low vacuum. I presume your idle speed table doesn't increase at 200 degrees? Sorta similar to a carb having the idle mixture set incorrectly (rich) or the idle speed too low. So you installed your Holley Sniper. have noticed on the hand held is that Air/fuel Ratio rises to 20 +/- A/F and the I keep doing that with the same result. I did notice that when I thought I had it set Enjoy your Sniper! An undersized or partially plugged fuel filter is a classic EFI installation mistake. Shut off car/restart and it's back to idle at Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. If I put the truck in park it comes down to idle. I chased that gremlin for about three weeks and was convinced I had a bad throttle cable. Just add 5 or 10 degrees of advance and see if it doesn't idle better. In most cases the IAC (Idle Air Control) circuit is the source of the whistle. Lubricate the linkage so there isn't as much native resistance. If you haven't installed a Took it for a lap around the block and came back. That way you can get into that part of the table that needs tuning, and you can watch your learn numbers grow. The tps has slotted holes, can you adjust it to get to zero? Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. Have you confirmed your fuel pressure at idle is 60 PSI? 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. If you go too low then it may stumble or even stall when coming off of throttle. Copyright 2022 Holley Performance Products, Inc. All right reserved. When stopping, the brakes are unable to overcome the engine so I go to neutral just to stop fighting the engine. Then why don't you Get On The List for Emails Straight From Our Pro? Is there away to lean the idle out? My problem with the sniper is the whistling and hard throttle pedal, I have a 700r tranny with a kick down cable. It is how the engineers allow you to clear a flood condition when you detect it. They always responded to my questions with guidance that helped me choose the right system for me. After only running for about 15 minutes or so the system starts to fail stalling the motor. I had this same exact issue. I had a customer recently with a high idle problem that he eventually traced to pad plug on one of the vacuum ports. Two things to keep in mind as you do that. Sniper is still learning so it will continue to improve.Second, you may have heard the phrase, "correlation is not causation." EFI System Pro had everything I needed for my EFI upgrade. Everything was working perfectly and I shut off the engine. The throttle blade adjustment is at 2-6% at hot idle, and with warm engine 185F. To get it to idle the tps is at 2-3-4% even with linkage disconnected and a return spring installed. A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. 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. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. I took some pics of the sensors page this morning after the car warmed up. It sounds to me like it is way retarded.In the event that the timing is right then take a look at your AFR--the actual AFR, not the target. But nothing beats a good solid gut-check One thing you need to sync the timing and set the inductive delay. When the lambda is 1.0, the displayed AFR is 14.7;1 REGARDLESS OF THE FUEL. I think that your Sniper system is working fine but would definitely check ouf the fuel pump. Start engine let it warm up to 160, learn mode is learning. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. But there are several degrees of play there in which it should still work fine. Thanks in advance for any advice. Turn the idle speed screw on the primaries in about 2-3 turns after it makes contact with the linkage and starts opening the primary throttle blades. Good luck! May God's grace bless you in the Lord Jesus Christ. However I do have a couple of issues I hope you can help me resolve. Take it a step at a time. I installed another return spring for the rear plates problem solved instantly. Then you can take a close look at the IAC and see if it is opening. Ok, so I'm stumped! 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. I would disregard any correlation between idle control between the Stock and Street/Strip setups. The latest was changing the power brake booster.Today I drove it to work and no issues at all. 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. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. I never had a problem with this. In this short video you learn to replace the IAC. A few, however, get tangled up getting the idle control working just the way they want. If more info is needed just ask. Fortunately, I have an article that goes into this in some detail. issue. Either the Walbro pumps you are getting are not genuine (lots of forgeries being sold) or else you have something that is killing them. When running it will only stay in closed loop and learn at idle. The team at EFI pro are some of the best I have ever dealt with when coming to ordering parts or having the knowledge to answer any question you may have. Very annoying ended up being simple my rear plates would stay open constantly it was driving me nuts I'd let off the pedal idle at 1300 blip the throttle a few times finally come back to 850. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. The problem I'm having is I cant get the IAC to drop down off 100%. And Earl's makes a fantastic little 100 PSI gauge. It will still change a bit with weather changes and when you get into infrequently-used sections of the map, but it's nothing to worry about.Regarding your idle speed immediately after start-up, that is determined by your Idle Parked Position. Well you were right air was entering from another source. Glad to hear that you have timing control enabled, Gary. Please let us know how this works out for you! My Sniper started having a ticking noise-- I have 90 miles on my Sniper, but this started the last 10 miles or so: it still drives fine, but it worries me so i've stopped driving it for now. I have never seen issue when CTS is below 120 degrees. I know this is old, but I bought and installed a Sniper kit in 9/18. It only lowers to 2-6% when I take my foot off the gas. The AFR was pretty consistent around 13. You will need to change the -40 degree idle speed setting again but I recommend not touching anything else. I am having an idle issue (other than that is absolutely perfect). Hello Chris. These aren't generic newsletters either but instead personalized emails. Bolt on 4150 Flange Carburetor Replacement. knowledge with the sniper efi setup. My Sniper is 99% great! Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. First, check to make sure that the IAC is properly mounted and connected. It's pretty hard to get the header tubes glowing at idle with a lean AFR. Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. Plus, you can email that file to me and I can be of more help. 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. Unless you have ignition control enabled, that is the only thing it can do to reduce the idle.Realize the only things that can cause the car to idle up as you describe are air and ignition advance. You advise would be greatly appreciated. Was perfect idle iac reading 3. Try it! Sniper EFI Idle Tuning. Fought a high idle issue until I changed your idle speed curve fix along with dropping the IAC hold to 10%. 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! No power at the programmer and no fuel pump running. !I called Holley today, and before I could even described the symptoms the 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. If you go the other way then you might find that the IAC zero's out when the fans are off. Capability Range: Moderate I recently had IAC issues identical to what you describe. That will happen occasionally, but less as time goes and on and the engine tune stabilizes. 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 Chris thank you for the info. The link above includes the option to buy a -6 AN Also its extremely rich at idle. Ive had an idle at neutral as high as 2400 rpm. If i set the idle to 750, the only way i can get it there is to turn the idle screw all the way out but then its at 0 iac.
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