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Why is this? Idles ok, runs great cruising, but from a stand still or downshifting and making a turn, when I get back into it, it wants to fall on its face. You advise would be greatly appreciated. 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. I can have it working fine (5% to 10% at target idle at operating temp.) By the way your site and your accessory products are nice. Ive played with the timing on this thing multiple times.Car was fullly restored last year. You can find those settings here: Handheld: Tuning > Advanced > Advanced Idle > Rampdown, Software: Idle > IAC Settings > IAC Ramp Down. Be aware that there is a spring behind there and a diaphragm that you don't want to tear. close to idle with the IAC between 2% & 12%. If your TPS is at zero and your IAC is at some random number above 8% (but not exactly 30%) then for some reason your engine has not met the conditions to ramp down to target idle. If that tested out okay then I can really guess that there might be some sort of intermittent, temporary RFI. Did you find this enlightening? 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. Ive had an idle at neutral as high as 2400 rpm. I started with right after I first adjusted for 2% IAC and took pics about every 30 seconds over about 2 minutes. He has walked me through every question Iv. Its timed to 36 degrees. But he kept having problems so eventually he did a complete check and then he found the problem. If I block off the iac with tape , I can get it to somewhat idle, but its not consistent. Changing the rpm curve and target rpm has no effect. One thing you need to sync the timing and set the inductive delay. Thanks. With the engine still idling high park, set the brake, open the hood, and remove the air cleaner. But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. The hold position is part of the response that keeps the car from dying when you come off the throttle. The Super Sniper will allow you to monifor fuel pressure if you add an electronic sender but this is not an option with the standard Sniper. It felt like it was flooding out at low speed, low. Holley Sniper IAC Surging???? 680-700.I can't find any reason other than it looses where it is in the firmware with It works instantly for him.If that fixes your problem then you have a starting place. Possibly cap, rotor, coil? 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. If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. The fact that it ran so (at times) with 90+ PSI fuel pressure is a testimony to the Holley's closed-loop technology. Thank you for your input. It is simply for the benefit of the user. 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. 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. Holley Sniper EFI Problems: Best Fixes According to Manufacturer Top 10 Sniper EFI Installation Tips from Holley's Tom Kise Any ideas here? They are prone to be inaccurate. 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. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. In the Wizard, select the stock cam setting. Your second problem should be a bit more concerning. Is this normal ? It is temperature dependent but 30 is commonly where you find it. With everything else being right and since you can make it start by adding fuel it seems like you must have some sort of fuel pressure issue. 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. Since your target is probably more like 700, and since 2400 is way over 1700 RPM, it's going to leave the IAC in the park position.Buckle down and find how air is getting into your engine. Bryan McTaggart 02/28/2023 news Solving RF Interference Issues in Sniper Installations - EFISystemPro.com Don't know if I should put this in a separate post. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. Idle was back to normal but iac was at 0. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . If not then you have some other issue that is behind this increased idle. Another suggestion is to add an extra turn to the spring built into the linkage to increase the closing force on the throttle shaft. 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. (If you do this you will need to reset the -40 degree setting mentioned at the top of this article. It's all part of the pleasure of EFI. I've read that a spacer with 4 individual holes will solve this, but after I installed the progressive linkage the noise went away!! I received from the controller manufacturer greatly understates (at best) the repeated failures of others I know personally who have tried and failed. When this occurs, I sometimes can shut it down and it will return to the correct settiings. On EFI systems such as Holley's Sniper, all of the EFI sensors (except for the O2 and coolant temperature sender) are mounted snuggly in the throttle body. Holley Sniper EFI 543-122 Sniper EFI Remote IAC Kit But before you adjust the ECU to lean the idle out, first confirm that your fuel pressure is right. Ive tried setting the prime setting above 150 but it wont take, it always goes back to 150. I have tried your 10-step idle adjust and ive adjusted the idle curve. Cracked casing from a side cover screw being installed crossed threaded. This was an issue in the earliest version of the Sniper firmware. You will have to do this until the TPS stays at 0% when the throttle is closed. There's nothing wrong with manual tuning, but at this point that is just compensating for an inadequate fuel map. Then, the next time I cranked it, the idle went high and won't come down!" I go into much more detail about that in this article on startup tuning. I'm compltely stumped and my wife is certainly upset I'm spending so much time between the garage and the computer for something that should basically run out of the box. 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 I adjust idle screw out to get the tps to zero or even 1% the engine will not idle. Confirm the placement of all wiring, ensure that the WBO2 sensor is positioned properly, etc. May God's grace bless you in the Lord Jesus Christ. All in all, considering the system has been installed for less than 2 hours drive time we're BLOWN AWAY at how quickly it is "learning" this engine. port that goes right on the inlet of your Sniper and makes installation a breeze.If your fuel pressure is solid at about 60 PSI then you should start looking at The Sniper will be controlling the timing so it will be based on a multitude of factors. Holley have given a new unit. I have never seen issue when CTS is below 120 degrees. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. When I covered the IAC with my finger, the RPM dropped so low it stalled. % = 49 It may take a few tries. If the vendor from whom you bought the system is coming up blank on ideas then don't hesitate to contact Holley's outstanding tech support department directly at 866-464-6553. Supports up to 650hp with Four 100 Lb/Hr Injectors! Otherwise, if removing the air cleaner eliminates the whistle then try to use a thicker gasket or try lightly greasing the gasket. Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. Did your process to adjust idle to 860. Were the additional load a simple step function it would be challenge enough for the ECU to gracefully increase the engine speed without overshooting. If you're having issues with your Holley Sniper IAC getting stuck at 20, there are a few things you can try to fix the problem. It's hard to know what the previous owner did right versus wrong. What is it supppse to be at idle and while driving under heavy acceleration? You'll have to go back and forth a couple of times to get it just right. Should the iac% fluctuate? A good example of why it's so important to run a good pre filter in the fuel line. Again, I would lean on that solution to let the vehicle drive/learn before you try to "fix" anything. Seems like its too slow to grab idle when ac kicks on. Then it will ramp down to 1200 but will not return to idle. Once engine is warmed up been driving for awhile. mail today. It sounds a little different from mine, since it commands a 1300 or so increase intermittently. I believe that you have this problem solved now with your new inline filter/regulator. Wish I had bought my sniper from you, but unfortunately didnt. I've tried repeatedly re-creating the scenario in hopes that the E.C.M. I am at the point where I almost insist that every Sniper EFI System owner purchase one of these. The link above includes the option to buy a -6 AN I am Japanese who attached Sniper EFI. My problem is low idle. Thanks so much for reading! Then your low idle problem will go away. While this video is not meant for the Sniper EFI user it does provide a great overview of how your ethanol tuning adjustments must be made not only to the base fuel map but to the other configuration settings. Drives just fine but won't stay running unless I keep my foot on the gas. 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. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. Get On The List for Emails Straight From Our Pro? Somehow air is entering the engine that was not entering the engine when you originally set the idle speed screw. Now, 1% on the TPS isn't a problem, but when it goes to 2% (which is inevitable if you have RFI moving it to 1%) then the IAC is going to go to it's hold position (30% by default) and the engine is going to rev up. Ensure that the secondary linkage is completely closed (both visually and manually.). I think you'll be all set! It starts cold fine, its just when its hot. My dad wanted to recheck the timing so I set the Static Timing at 15 and it runs perfect. mean that the IAC is causing it. (I'm running from a fuel cell on the garage floor 10 feet away with lines in plain sight and do see fuel coming from the return at a decent flow. By the way, this is a new installation on a 69 Camaro, stock 350, dual sync, etc. I hope everyone enjoys this v. When you have the issue you should disconnect all hoses and plug the ports on the Sniper. 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. Get that thing installed and you're going to know a whole lot more about what's going on. That will happen occasionally, but less as time goes and on and the engine tune stabilizes. But get that fuel system fixed before going any further. Any suggestions? Price Point: $$$. The IAC is hanging open and not really at 0. Chris, I recently installed my Sniper and have an intermittent idle problem. At this time, TPS is 0%, IAC is 50 to 60%. You're going to have to get this fixed or it's going to cause even more problems than the high idle. I am right back to where I started. 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. Throttle Tip-In tuning can be a bit of a challenge but I'm confident you can get this resolved, Mike.Let me start by saying that unless you've really done a lot of driving on the system in some useful learning situations then I would set this issue aside and not even think about it. All times are GMT-6. I will try the other stuff when I get off work. Both Sniper and trans controller grounds were direct to the battery ground, as they should be. Idle IAC problems? - Holley Performance Products Forums Or, at least, it should. I managed to get the IAC down to around 0% - 8%is this good? 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! One additional wrap on the secondary coiled shaft spring is all that's necessary. But nothing beats a good solid gut-check :-). Cycling the power to the Sniper EFI would cure the problem, but not prevent it from coming back. Not good.There isn't set solution here that works for all engines. I installed the Sniper on my 1978 Ford F-100 with a small block I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Have a look--I think this is going to allow you to fix your idle problem. I keep doing that with the same result. You'll be amazed at how much of this just "goes away" when you drive it enough. IAC Calibration / Hanging rpms | Team Chevelle Thank you. If it is already adding fuel, it may be worth expanding this into the area where the tip-in is occuring (and where there is no learning occuring. Hey Chris! Yes, you are correct. The headache is the Acceleration Enrichment. Should I just disable idle timing control? It is made by one of the biggest names in fuel filters and sold under the Parts Master label so it is quality and great price in one. I didn't find your site until I was having trouble. Though they both are indications of the amount of opening through the throttle body, the TPS is the throttle opening percentage and the IAC number tells us how far the IAC stepper motor is opening the bypass air circuit.If I understand you correctly you are saying that the TPS reads somewhat normally (traveling from 9% to 100% or so) but that when you cycle the key it once again starts at 9%. Worst case you'll have a spare on hand, and if the TPS is faulty you will have solved the mystery. Has a good size camshaft cant find any vacuum leaks. As I said above, you could have a bad IAC, but then again, the IAC might be fine and there's a deeper problem such as RFI noise causing the issue or a vacuum leak that is confusing things. it will jerk and rpm will go up and down and AFR will be around 20 : 1 or more or less. Just getting it to act right at startup is a struggle. idle at 1100 on the "stock" file it's better with street strip.The IAC counts will be at zero. I'm new to the efi thing and any help would be seriously appreciated. Inj. Thanks for any help. I will turn it up some. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. Technically it is a warranty-voiding maneuver so proceed at your own risk. Yes it is controlling the timing and I had issues at first and it controlled the idle just fine. *Possible delays due to Covid-19 click for more information. Give them a call and if they are unable to provide customer support the contact the Holley tech support line at 1-866-464-6553. It will need to see it again and again. Only show this user . I think in some of the Wizards with the handheld it doesn't use 57.5 as the default. If I try and get the 2-10% i get all the way up to 1200 rpm. Then follow all of the instructions above, including confirming the idle speed curve setting at -40 degress as well as following my 10-step process for setting the idle. Nice to meet you. Then it started behaving oddly. Let me be perfectly clear: If your engine will not drop below 1350 RPM with the idle speed screw turned all the way out then you have an air leak. I do know that the reference angle is 57.5, the inductive delay says 100.0. But another thing to consider is adjusting your target A/F ratio. Software: Idle > IAC Settings > Idle Spark, Handheld: Tuning > Advanced > Advanced Idle > Idle Spark, After completing this 10-step process, if the temperature displayed on the handheld is still above 160 degrees the engine should go right to it's target. Running a bbc with coil - my timing is perfect. The tps will not auto reset to zero. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. If the TPS is 1% or below then the air is coming from somewhere else. :-) Just don't let the parts go flying. My IAC and TPS show zero when it does this. 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. 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. Ultimately, it is about making the pedal softer, particularly at initial throttle opening. 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. You will need to change the -40 degree idle speed setting again but I recommend not touching anything else. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. Some have suggested the gasket might cause it but I've never heard of anyone fixing the whistle by adjusting the gasket (and many have tried. However, I can't think of a single one that was because of low vacuum. Remember that as an EFI System Pro customer you have access to me at any time via my cell phone. When you experience this, before you touch anything or shut the engine down, first look at your TPS and your IAC. Hey Chris If your TPS has snuck up to 2% then your IAC will be at the hold position, which by default is 30%. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. Hello Chris. Plus, you can email that file to me and I can be of more help. First, let me congratulate you on your patience in letting the system learn. Covered the IAC port and set idle for 850 ish. i'm having is I can't seem to get the truck to run faster than 45 mph at speeds If I go any more it will ping. If the solutions suggested above are not working then you need to review my article on IAC Testing Procedures. The idle is 1350-1400 with the idle screw at initial contact. I have replaced the IAC motor and the problem remains. Let me start with the engine not starting until you press the throttle. Am I missing something. Holly offers a very nice Analog-Style Fuel Pressure Gauge that is another option. This will let you know at a glance if something is going awry with the fuel pump. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. It then started working normally again. First thing I would check If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. Since that has long been corrected we have moved that information to the bottom of the article.). After much diagnosis, I ended up replacing the intake manifold gaskets. If it does then you can put on a heavier spring so the advance doesn't come in as fast, or use a lighter weight. My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. For someone in your position, it will become an indispensable tool in your tool box. Free ground shipping regardless of order size! If you suspect this then try to find a situation where this occurs where you can safely check the secondary throttle shaft and see if i's slightly open. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. Um, no. The car cruises fine, and if I was to keep idle at 2000rpm the issue wont happen, its only when the car tries to ramp down to idle position.Thank you for your help, any advice would be appreciated.Thank you,Eric, Whenever we see the AFR go to "Heating" that is an indication that the ECU has been reset. Holley documentation and videos didn't work and the $300 I paid for "expert" tuning didn't work either. i would have been happy to answer there. I have quadruple checked my wiring and am certain it's correct. Really appreciate the amount of learning im getting off here. Wish I knew about it before I made my purchase. You are aware of the idle-up problem. Not that I noticed. I did all of this before seeing the link you sent. The noise changes sound with the throttle position. 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. If they are closed, check the primaries. This may sound crazy but I'm going to jump out on a limb here and say you don't have an idle issue--you have a timing issue. I had this same exact issue. I keep wondering how it was running so good with EFI parts, including the throttle body, and the problem persists.Please give me a hand.