This car has never idled under 900 without stalling with 3 carbs and does the same thing with sniper edit. For someone in your position, it will become an indispensable tool in your tool box. OK, I did the baseline idle speed screw setting. 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. When I covered the IAC with my finger, the RPM dropped so low it stalled. Often, folks will say, "I did everything you said. So check that timing and I think that you're going to find you need a good bit of advance. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. 34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. 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. Please let us know how this works out for you! To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. As I said I didn't buy from you so you don't owe me anything. 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. Adding a wrap to the return spring on the shaft is one alternative to solving this. Give it a watch: https://youtu.be/7SO7-tZn6iw. The fact that it ran so (at times) with 90+ PSI fuel pressure is a testimony to the Holley's closed-loop technology. There is a chance that the IAC is open but displaying 0% so start by putting your finger over the IAC opening. When I drive with warm engine the IAC is at 30% when pushing gas, but shouldn't it be at 0%? The resulting resistance can burn up fuel pumps, wiring and relays. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. (Do this while you are cranking.) But if the idle is a little bit higher then it doesn't have to jump quite as much in response to the load, and tends to react a little bit more smoothly. Your second problem should be a bit more concerning. Using a Snap-on variable timing light so this is why I say timing is perfect. If the issue persists, you may need to replace the IAC. There's still a very small amount of airflow that squeezes past a closed IAC valve; it's that venturi like sound you're hearing. Your mechanical advance will naturally change the timing a bit but it should be fairly close. Next, clean the IAC and all related parts with brake cleaner. It is simply for the benefit of the user. But I think it is safe to say that you are now at a point were some manual tuning is a good idea. Well you were right air was entering from another source. Should I just disable idle timing control? What might cause the TPS to go to 2%? The "PC Text" indicates what will be shown on the PC/Laptop data monitor or data logger. When stopping, the brakes are unable to overcome the engine so I go to neutral just to stop fighting the engine. Did your process to adjust idle to 860. I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. Nothing against Holley's method but I need to keep things simple and I do that by eliminating the effect of the IAC entirely while getting the idle speed adjusted. idle counts from 0. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. Incorrect connections will result in excessive resistance. And, hopefully, within those degrees you will find a place where you don't get the whistle. I installed my Sniper and the engine fired up great. Copyright 2022 Holley Performance Products, Inc. All right reserved. I hold my foot steady in place it does this in 5 second cycles and if i let go of Any idea's? Featured Products Sniper EFI $7.07 - $2,457.95 470 Products View Parts author Staff Writer 1711 Posts An Article About Video tech Sniper EFI Videos Sniper EFI Tech Sniper EFI sniper Installation You want to ensure that nothing is hung up in there.The only thing that I can think of that would cause the fuel pressure to spike when the motor starts is the increased fuel flow at the higher alternator voltage (jumping from 12.0 to 13.5 volts or so.) Clearly, something is changing. Maybe give it a half-turn before you start it and then start and tweak. Yes, let me know how that setup process works. 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. Take it a step at a time. Hello Chris. At that point, with 90 PSI of fuel, the ECU can't turn the duty cycle down low enough to idle properly. The warmer the motor, the higher the idle will be at this point. Drop the IAC parked position a bit at each temperature point and sort of back into the solution. Changing the rpm curve and target rpm has no effect. Holley Idle Air Control Motor Idle Air Control Motor Fits the Following Applications: Sniper EFI 90 mm, 92 mm, 102 mm Throttle Bodies Digital Pro-Jection Systems Avenger 4-bbl TBI Commander 950 Terminator TBI Thanks again for your insights! What must remain foremost in your mind is that the only thing that can cause the idle to increase is additional air getting into the engine. 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. Don't be surprised if one or the other is slightly open. When I cover it with my hands, it gets quieter. Using the handheld, navigate to Tuning > Basic > Basic Idle and ensure your target idle speed is set to the RPM you desire. I emphasize "and" because the transmission controller manufacturer I used had the TPS ground terminated within the harness to the unit's main ground, which I find to be an unthinkable choice. 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. check out the. I'm happy to walk you through what is required. 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. All times are GMT-6. School's out for spring break this week though so I'm covering for employees on vacation. 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. I have tried your 10-step idle adjust and ive adjusted the idle curve. So you installed your Holley Sniper. They always responded to my questions with guidance that helped me choose the right system for me. Thanks in advance for any advice. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. That's not the IAC Hold Position, it's a percentage value. There are two ways to address this--you can let the system learn or you can manually adjust the acceleration enrichment. Also when ac kicks on it will idle down and stall. You can drop it down and you will find it will behave more like you expect. Once you so this, and after you have your CAN-to-USB harness attached to your laptop with the Sniper software, you can see precisely the cells where the system is operating when the bog occurs. Setup: 1965 Impala SS; ZZ6 Crate Engine, EFI Distributor. It could be, but that seems unlikely.Instead, you need to look at the basics. I have seen a couple of videos on you tube of the same issue but they don't seem to have found the cure.I hope it is not a computer problem as I have already replaced the entire system because of another problem. I have driven it a few times maybe 100 miles or so. This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 Don't know if I should put this in a separate post. So try changing your IAC hold value slightly:Tuning : Advanced : Adv. It starts cold fine, its just when its hot. Then, when you experience the high idle, note if the IAC number has increased. 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. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. TPS 0. 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. Good luck! Thanks for the great question! I'll have to check again tomorrow. Watch videos on installation hints and if you haven't yet, download & read every Sniper installation guide you can find online. 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. Until the engine starts, the throttle only has one purpose: To detect you pressing it to 60%, at which point it shuts off the fuel injectors. Could the IAC be broken/malfunctioning? I set it exactly like the instructions said and my iac is not only all over the place but when I finally did get it to the 2-10 range it's highlighted in red. (Grease can sometimes do the same thing as a more permanent gasket sealer without making the removal of the air cleaner such a pain.). If I adjust idle screw out to get the tps to zero or even 1% the engine will not idle. I would suspect something is coming loose causing a stop to the EFI system/Fuel flow. So something is triggering the ECU to be in Open Loop. My problem with the sniper is the whistling and hard throttle pedal, I have a 700r tranny with a kick down cable. have the system learn the higher speeds? 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. When you have the issue you should disconnect all hoses and plug the ports on the Sniper. In your case, however, I think you're close to getting it running. Get On The List for Emails Straight From Our Pro? $107.95. If you hit the gas it pops & backfires through the throttle body. On a cold start it will idle at 750 everytime, But if its hot start it will jump upto 1600rpm for 2 seconds then come back to 750. My IAC and TPS show zero when it does this. The IAC should display a 2-8% to bring the idle up to the actual target. Otherwise, if removing the air cleaner eliminates the whistle then try to use a thicker gasket or try lightly greasing the gasket. You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. Fortunately, I have an article that goes into this in some detail. close to idle with the IAC between 2% & 12%. And the rather cavalier "Absolutely!" It is a common one. The headache is the Acceleration Enrichment. 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. If I were there in person I would test the function of the IAC (see this article.) What I can't explain is why your TPS is acting so randomly. Sniper EFI Problems - Holley Performance Products Forums The only way to confirm RFI problems is by doing a data log. After doing TPS reset it starts fine but when you give it some gas it hangs at 1500 and will not return to idle. 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. That is the IAC hold position. Relatively new Sniper EFI install on a '69 Mustang 302. I.e. Also ensure the TPS Position returns to zero at idle, & the IAC Hold Position isn't setup too high. Two things to keep in mind as you do that. 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? first attempt but as it tries to idle down to the target RPMsit can never even My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. Be sure to re-enable it once you get your idle tuned. If you go the other way then you might find that the IAC zero's out when the fans are off. After manually making the sensor go through the full range a few times, I reinstalled it and now my TP will read anywhere from 0% to 4% when I key on. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. It meets the target idle perfectly in either but if I lightly stab the throttle it tries to stall after slightly revving. Tried that and it didn't work? :-). Reply Quote. You will need to change the -40 degree idle speed setting again but I recommend not touching anything else. Let me start with the engine not starting until you press the throttle. )Then look a the datalog and find out what TPS ROC and MAP ROC is most likely to cause the problem. Two months fighting, cursing, not getting any help from Holley OR the forum, and a stupid little tin plate. The second thing to realize is that even after you get it just right, you need to keep an eye on the IAC number and reset the idle if it gets outside the 2-8% range when idling when warm. This is a mighty big subject for a blog post reply, I should probably start doing some videos on this. Do you have any clue? My car will not idle right until it gets to around 130 -140 degrees. I installed a sniper efi system on my 1969 Camaro. Sniper EFI Update: Weeks Later, Do I Still Feel It Was Worth It? The engine makes very low vacuum at idle. 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.
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