Add To Cart. Follow this link to download it for free if you have not already done so. 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. such high fuel pressure. The fuel pump is mounted under rocker panel as low as possible and far away from any heat. The learn function will offset the base fuel table until the closed-loop compensation only requires minimal changes. What you are experiencing is rather common. Mechanical Fuel Pressure Gauge on the inlet of your Sniper, now is the time. You advise would be greatly appreciated. What can I do? First, let me congratulate you on your patience in letting the system learn. I then saw you guys have an awesome little gauge that can hookup inline to the snipers existing fuel feed?? Once you confirm the operation of your IAC then it's time to read my article on Solving RFI Problems. No, the idle speed curve setting isn't something that you normally worry about--and especially not down at minus 40 degrees farenheit. 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. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. I have an adapter on the manifold for squarebore to spreadbore and then a phenolic spacer. Took it for a lap around the block and came back. See these. I chased that gremlin for about three weeks and was convinced I had a bad throttle cable. Except at idle. Then why don't you Get On The List for Emails Straight From Our Pro? Your comment doesn't imply any sort of problem that would make me give up on idle timing control. Enjoy your Sniper! It is temperature dependent but 30 is commonly where you find it. Should the iac% fluctuate? There are two ways to address this--you can let the system learn or you can manually adjust the acceleration enrichment. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. View Holley Sniper EFI Self-Tuning Kit - Shiny Finish. If that tested out okay then I can really guess that there might be some sort of intermittent, temporary RFI. Please let us know how this works out for you! But now that Terminator X is available, I highly recommend going that route. Either the Walbro pumps you are getting are not genuine (lots of forgeries being sold) or else you have something that is killing them. 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. And your understanding of how the throttle position affects idle is exactly correct. And yes, monitoring the fuel pressure is the right answer. We can not hit it at all, we hit the pedal abruptly, the engine gives a lot of excess fuel, the AFR gets super poor at first, the car stops, then the AFR gets super rich and the car runs until it cleans up. Jump on board now! Ensure there isn't a vacuum leak causing the IAC Position to drop to 0%. I watched the butterflies start to open at about 35 on TPS. Fought a high idle issue until I changed your idle speed curve fix along with dropping the IAC hold to 10%. :-DStill, I hate to leave someone hanging so I'll try to help. Your suggestion to remove the PCV valve is just for diagnosis purposes, right? Copyright 2022 Holley Performance Products, Inc. All right reserved. 63 bomb 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. If the IAC number is increased during this high idle, review the points about high idle from tuning issues. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. My Sniper is 99% great! I'm new to the efi thing and any help would be seriously appreciated. 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. From herethe cycle continues and I am 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. I've increased the IAC rampdown time to 8 seconds to try to combat this, but wondering if it will correct itself over time or if I need to possibly replace this TP sensor. Also its extremely rich at idle. You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. The engine ran so good, I would have never suspected the Fuel Pressure to be an Make sure that your blanking level is _below_ that (being careful not to find yourself in the situation I describe above.) Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. These problems will go away when you do that. I also tried changing roc/map to 8 from 15 again no change at all.My ve table is smooth and tuned I even changed my AFR to 13.5 from 14.2 and no change at all. 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. back upthe RPMs shoot up to anywhere between 1500 and 2000 and they will not get Even though the Sniper's fuel map is programmed to provide the correct amount of fuel via injectors spraying at 60 PSI, if the pressure is jacked up to 90 PSI the wideband sees that you are rich and faster than you can even detect it audibly lowers the duty cycle to inject the correct amount of fuel. My problem is low idle. It's pretty hard to get the header tubes glowing at idle with a lean AFR. Now I have most of the bugs worked out it runs fine on the highway and around town it's just the idle. Ive had an idle at neutral as high as 2400 rpm. You can adjust this number up or down but there is really no need to change it unless the car is stalling.The sucking sound is just what happens when the Sniper EFI System is paired with certain intake manifolds. https://www.youtube.com/watch?v=2JpHlS1ymBc, If this is your first visit, be sure to The throttle position should be zero. One additional wrap on the secondary coiled shaft spring is all that's necessary. But get that fuel system fixed before going any further. A few, however, get tangled up getting the idle control working just the way they want. I am extremely suspect of what you were told about the Sniper ECU monitoring fuel pressure, for several reasons. any ideas? I enalble the idle timing control and fired it back up Iac was at 32% but it would come back down after a bit to around 26%. I ask because I'm using a PCV valve with my Sniper and have random idle issues as well. It felt like it was flooding out at low speed, low. Um, no. When I covered the IAC with my finger, the RPM dropped so low it stalled. 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! After a stall the car will restart but will be in a high idle. This value is itself enough to raise the idle a bit. If you have somehow overlooked this, start here: Holley Idle Speed Adjustment Instructions: Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. OK, I did the baseline idle speed screw setting. Please give this a try and let us know how it works! Generally, one of two things: a stuck throttle or noise on the TPS signal. When I cover it with my hands, it gets quieter. When I covered the IAC with my finger, the RPM dropped so low it stalled. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. If your fuel pressure is at or about 60 PSI then visually inspect the barrels of the throttle body while having someone key on the Sniper. you have it set. Initial Baseline Idle Speed Screw Setting, http://forums.holley.com/showthread.neral-IAC-Info, http://documents.holley.com/199r11031r.pdf, https://forums.holley.com/showthread-Idle-Solution, If this is your first visit, be sure to https://www.gmperformancemotor.com/parts/19210007.html, http://forums.holley.com/showthread.3128#post83128, If this is your first visit, be sure to The IAC is hanging open and not really at 0. Clearly, something is changing. However, I always preach to never touch any of the controls on the handheld until you have a couple hundred miles on the engine in a range of driving situations. Next, reach down into the secondaries and push the butterflies closed. So try changing your IAC hold value slightly:Tuning : Advanced : Adv. Any ideas here? Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. 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. If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. Thanks for the info Chris. Yes, having an accurate TPS is very important at idle. Thank you for any advice. I think you'll be all set! idle at 1100 on the "stock" file it's better with street strip.The IAC counts will be at zero. By the time I was near home, the idle in Park was 1050, IAC 0. Drive great and idles perfect at stop signs. IAC looks good once it finally s fires. I will turn it up some more.Is this something that the ECU will learn? I very pleased with the performance, it is a huge improvement from the 800CFM carb I had on this motor. Every time though I can turn the car off and restart and it settles at 850 with IAC 2-4.The thing that has me puzzled is how the with the only difference in condition of the car being the restart, the idle is "fixed"Any clues on where to look next please let me know. Thanks for your very detailed question! My guess is a faulty IAC since it is intermittent and I have not done any setup changes. I can have it working fine (5% to 10% at target idle at operating temp.) I have installed my Sniper and the car runs great. i'm having is I can't seem to get the truck to run faster than 45 mph at speeds You can manually set it 57 after you run the Wizard if required. You should get a light spray evenly distributed in all four barrels. When I removed the tape and started it again, it was idling at 1400-1500 RPM and sucking a bunch of air through the IAC, even though it showed 0% on the sensors screen (pic attached). Physially manipulating the linkage by hand will generally reveal if you have a sticking linkage that is preventing the TPS from returning from zero. 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. 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%. Even at 0% it's sucking a bunch of air through the IAC port. I did check for the lightning under the hood but all was well. 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. 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. You will find a startup IAC percentage, an amount of time it holds at that percentage, and an amount of time it takes to idle down to the normal idle speed.By default, that number is 50% at normal operating temperature. Cracked casing from a side cover screw being installed crossed threaded. So you installed your Holley Sniper. It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. Hot start it most of the time wont start unless I give it a little throttle. Some have suggested mis-setting sets the idle speed at 850 RPM but I suspect it is not a fixed number but rather a delta of about 300 RPM above the target. Hi Chris , greetings from Down Under (AUS) Just a note on the hi fuel pressure issue . It sounds a little different from mine, since it commands a 1300 or so increase intermittently. 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. 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. MSD pro billet and 6AL box If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. applies here because it is so important to realize that just because the IAC Let Yes, it will talk to you--but not with words. 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. No problems with either cold or hot starts. I think that your Sniper system is working fine but would definitely check ouf the fuel pump. If I block off the iac with tape , I can get it to somewhat idle, but its not consistent. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. It didnt do this with the carb on it. Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. If it is then something is commanding the ECU to open the IAC. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. After only running for about 15 minutes or so the system starts to fail stalling the motor. Enjoy! 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. 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. In most cases the IAC (Idle Air Control) circuit is the source of the whistle. If this is the case then I would look particularly close at the IAC hold position and IAC ramp start.Let us know what you find and what works for you! Fortunately, I have an article that goes into this in some detail. The tps has slotted holes, can you adjust it to get to zero? Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. If I try and get the 2-10% i get all the way up to 1200 rpm. You'll have to go back and forth a couple of times to get it just right. The first thing I'd do is check your fuel pressure with a gauge like this. 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. Even 50 RPM can make a difference in how much impact the transition to Drive has on the idling engine's ability to stay at a fixed RPM.I would not recommend it in this situation but anytime a "kick" in idle speed is desired that is easily done by setting the kick value in Tuning > Advanced > Adv. That 60% (which is configurable) is known as the Clear Flood TPS. That is a good thing.I don't have a specific target RPM but always encourage automatic transmission users to bias the idle just a tiny bit higher than what you might otherwise. Your issues are likely related to one of these two things. (Note: in the original version of this post we had a section about checking the idle speed curve setting. Also, I was seriously rich at idleso rich it hurt your eyes. shut truck off. When you set the Static Timing to 15, what did you read with the timing light? The symptoms I had was a low cold start idle and going lean coming to a stop. knowledge with the sniper efi setup. have noticed on the hand held is that Air/fuel Ratio rises to 20 +/- A/F and the I have certainly seen this before on other fuel injected vehicles when hot. The Sniper resets the TPS to 0% each time that you key the system on. Start by doing the fastest start you can that doesn't bog. I am at the point where I almost insist that every Sniper EFI System owner purchase one of these. 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 I installed a sniper efi system on my 1969 Camaro. Ilike a few othersam having idle issues. 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. Solution #1 Put car in gear take off and the engine runs GREAT, no issues drive for 10minutes take car out of gear and engine idles correctly IAC between 2 and 5 Solution #2 Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. Well you were right air was entering from another source. The person I bought it from said he never could get it to run for more than a few seconds. If I'm driving along and pull up to a light and leave it in gear it idles just fine but it seems not to be able to compensate if I put it in neutral and then back and drive. Give it a watch: https://youtu.be/7SO7-tZn6iw. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. I would recommend that you call first thing in the morning, as they tend to get quite busy during the day and wait times can get long. Hello Those don't impact the way the engine runs and can cause the whistle sound you describe. Cycling the power to the Sniper EFI would cure the problem, but not prevent it from coming back. 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. I am new to the EFI scene but want to learn. These aren't generic newsletters either but instead personalized emails. It's all part of the pleasure of EFI. Ive tried setting the prime setting above 150 but it wont take, it always goes back to 150. 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. I pulled over and turned the car off and then back on. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. Also what would you say a desired idle should be for a 3 speed automatic ford? If I go any more it will ping. It could be a couple of things. Ive also used another snap on light to confirm. That is not the way to go. And all too often we don't take that extra step of using a piston stop to ensure that the timing pointer is on zero when the engine is truly and exactly at top dead center. After this whole process, the car normally rotates without a very abrupt pedal. The noise changes sound with the throttle position. Or ?I have put a fuel pressure gauge right at the inlet of the sniper and it is reading 60-64 psi. Thanks Again for your help. 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. 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. 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. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. I have tried your 10-step idle adjust and ive adjusted the idle curve. The manifold pressure increases with the throttle opening but the RPMs are still low. Rpm with 4-8 iac but it still shows red and shuts off randomly at idle and it won't even drive 2 miles without shutting off. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. Ok, so I'm stumped! To get it to idle the tps is at 2-3-4% even with linkage disconnected and a return spring installed. Save Share. It has gotten a little better after I drove it for three hours today.I want to save the Kik because if I get this working good then I would like to add A C and use the kick for it.Motor is Mopar 360 with mild cam and automatic. Note that sometimes you can get into a back-and-forth situation. Okay, try my method. Holley Sniper IAC Surging???? :-) Just don't let the parts go flying. Hi Chris. These are "transitional" cells, and you really have to make the effort to learn in these areas of the map. Perfectif you have the original synchronous linkage. Ran 2 Holley carbs and an Edelbrock. Both answers you've received greatly oversimplify the truth in favor of the answerer. In addition to avoiding this particular problem, the total solution is much better. when things aren't working and this provides just that. Part# 538-13. You're going to have to get this fixed or it's going to cause even more problems than the high idle. But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. Adding a wrap to the return spring on the shaft is one alternative to solving this. This will let you know at a glance if something is going awry with the fuel pump. Strangely, what I've seen is that it idles too lean as the injectors are effectively shut off.Thanks again for the follow-up and glad to hear that everything is working well now. Once it commands that high idle I haven't found anything to return it to normal, other than shutting it down and restarting. If I were there in person I would test the function of the IAC (see this article.) Do you have a PCV on the engine? 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. 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. It could be that the air flow across the secondaries as they are opening is creating that whistle but that isn't commonly the case.Did you check for leaks around the gasket of the air cleaner? It is good to at least know that the Sniper fuel pressure regulator can have high pressure failure issues (contrary to what I posted to Scott back on April 13th!) 1. The IAC reads 36 when at idle fully warmed up. to. The IAC should display a 2-8% to bring the idle up to the actual target. Idle was around 1000 mark and iac 0. idles good, runs amazing. EFI Systems based on Holley's world-class Dominator and HP ECU's. idle counts from 0. (It should be at or near 60 PSI at idle. That is the IAC hold position. I will turn it up some. We do that but most places don't. That is the only way to fly. 90% of time with engine hot. If you have any questions about the car/setup let me know. Please help. I have probably 200 - 300 miles on this engine and it has always done this. You could go either way.. Nice to meet you. You mentioned going from 13.5 to 14.2 but you'd want to go in the other direction--maybe to 13.2. Seems like its too slow to grab idle when ac kicks on. I would suggest at that point you need to contact whoever is providing your tech support and find out why the default values are not working for you.
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holley sniper efi iac problems
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