I would disregard any correlation between idle control between the Stock and Street/Strip setups. Or alternator? Chris's Idle Speed Adjustment Instructions*: *Note: If you are using your Sniper to control ignition timing then I recommend that before you start this process you disable idle spark control If you are trying to do this while the ECU is simultaneously trying to bring your idle under control by adjusting the advance it is going to be counter-productive. This is extremely unreliable afrer warm. The first place my eyes go when there is any issue with the idle is to the TPS value. RPM = 1200My slow gear I leave with 650 RPM, the IAC Position I leave between 5 and 6%, the Chris---I am contemplating replacing my Holley 750 on my new low vacuum 600 HP 496 with the Holley Sniper FI system. I will be at a red light trying to brake against the engine. Observing the temperature on the 3.5-inch handheld (only), wait for the temperature to achieve 160 degrees F. Once above 160 degrees, turn the idle speed screw so that the idle is about 50 RPM below your target idle speed set in step 1, above. If the screen shows iac at 0 and you block the hole to find it open what does that mean? Seems to behave more better now. Others might require 60 RPM. 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 have quadruple checked my wiring and am certain it's correct. Chris, I recently installed my Sniper and have an intermittent idle problem. I recommend you have a look:https://www.efisystempro.com/efi-pro-hangout/holley-sniper-efi-instruction/solving-sniper-rfi-problems, I recently purchased your fixed linkage to open primaries first and the throttle linkage extender to also get a smoother pedal. This is normally used as an A/C idle-up circuit. Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. I have replaced the IAC motor and the problem remains. Any ideas here? If it is not a problem with the Sniper EFI System itself then it could be an issue with some sort of harmonic involving the fuel pump. IAC is good 0-5% most of the time. I cut and heat-shrink wrapped the 5V wire and then ran both the signal and ground wires all the way back to the transmission controller. So if you are trying to achieve a stoichiometric mixture in ethanol (which is achieved at an AFR of 9.0:1) then you should continue to target 14.7:1 since that is what will be displayed. Sorta similar to a carb having the idle mixture set incorrectly (rich) or the idle speed too low. Tried that and it didn't work? Any idea's? Watch videos on installation hints and if you haven't yet, download & read every Sniper installation guide you can find online. If you look down and your TPS is 2% then either your throttle is stuck slightly open (which itself will cause the idle-up) or RFI riding on the TPS signal has caused the ECU to see the throttle as open and, as a result, open the IAC to the hold position. If the engine idles at 750 RPM with the throttle plates all the way closed and the IAC at zero then there is some sort of an issue. The headache is the Acceleration Enrichment. It's the same one that Holley puts in their Sniper Master Kits and I've never heard anyone with anything but good things to say about it. If so remove it. If I put the truck in neutral the TPMS will raise all the way up over 2000. I have tried your 10-step idle adjust and ive adjusted the idle curve. They tell you to ask call Holley. 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. 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. The only way to confirm RFI problems is by doing a data log. That changes almost instantly as the engine revs.Since the learning algorithm requires some time exposure to a certain condition to make larger changes, that half-second makes only the smallest impact. Both Sniper and trans controller grounds were direct to the battery ground, as they should be. However based on your reply I connected the Fuel Pressure gauge and The Tech Tips and discussions are also great! Capability Range: Professional I have been able to get it pretty Drop the IAC parked position a bit at each temperature point and sort of back into the solution. Um, no. Do you have any clue? Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Its timed to 36 degrees. If you set the RPM above idle to start ramp too high, then it may not ever get down to the RPM above idle to re-enable. This is actually more troubling than the sound you originally described. Duration @.050 is 240 intake 246 exhaust with .574/.578 lift. That will happen occasionally, but less as time goes and on and the engine tune stabilizes. Enjoy! By the way your site and your accessory products are nice. 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. ps. When you first posted this I had no idea how to respond. 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. Unfortunately I did not buy my sniper efi from you. Changing the rpm curve and target rpm has no effect. Advanced throttle body injection systems capable of transmission control and more. If you remove the air cleaner entirely and the whistle continues then you can rule that out. around 45 mph it bogs down, catches itself, bogs, catches, bogs and catches. If you do find you have RFI issues then I've written an . I keep doing that with the same result. Note: The IAC breather hole is the roughly 1/4-inch triangular hole that sits above and between the secondaries. Good The motor has 376hp at flywheel and the car is a stick shift. With the engine still idling high park, set the brake, open the hood, and remove the air cleaner. Relatively new Sniper EFI install on a '69 Mustang 302. Hello Chris. I'm so glad you found this helpful--that makes my day!Don't get too concerned about the specific learn percentage. If you go the other way then you might find that the IAC zero's out when the fans are off. Using a Snap-on variable timing light so this is why I say timing is perfect. 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. The throttle plates are misaligned. Bottom line ismy first one must have been faulty. 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. Cycled the ignition off. normal city driving, I no longer have other problems I had with the original I would not expect that an electric fan would create a noticeable load on the engine but if it did then you'd want to set the idle screw when the fan was not running. 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. I have changed my roc/tps to 7 from 15 but that only took me out of learn mode. I think you will find that it will learn its way through this. The Sniper Quick-Start Manual provides the following instructions for setting the idle. )Since this isn't a consistent issue with all Snipers that tells me that different IAC settings tend to make the whistle. (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. 30 minutes later CTS reads 161, start engine Idle is jumping from 450 (almost stall) to 1500, IAC is jumping all over 10 90. Could be a bad IAC motor, replace it and see if that solves the problem. When you have the issue you should disconnect all hoses and plug the ports on the Sniper. 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%. I'm new to the efi thing and any help would be seriously appreciated. Holley Sniper IAC Surging???? Capability Range: Advanced A common issue we see is a result of poor fuel pump grounding running a eyelet from the pump ground to a rusty or painted surface. I appreciate everything you are saying. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. 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. Cycle the ignition as instructed by the handheld and then navigate to the distributor setup screen. Key, I believe, in this success is solid connections, resistance-free signal and ground paths, and solid RFI rejection. Idle > IAC Kick. 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. Copyright 2022 Holley Performance Products, Inc. All right reserved. That is not something I'd ignore. 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. 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. hard start about 1/2 throttle from stop it bogs down after 3 or 4 seconds.What I :-)Yes, learn impacts idle too, and remember the even when the basic learning is done there will continue to be some learning for changes in weather, altitude, etc.Go ahead and try a few idle settings and see how they impact the idle-speed searching. It works instantly for him.If that fixes your problem then you have a starting place. 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 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. I'm wonder if the iac can cause this. It's all part of the pleasure of EFI. My problem with the sniper is the whistling and hard throttle pedal, I have a 700r tranny with a kick down cable. I installed Holley Sniper on three other Mavericks here in Brazil and the problem also exists.I did not make any changes to the parameters, only on Target AFR and the correction on the Idle Speed Curve chart. The symptoms I had was a low cold start idle and going lean coming to a stop. Yes it is controlling the timing and I had issues at first and it controlled the idle just fine. Once you've done this, the next natural step is to transfer the learn table to the base map, then go in and smooth out the sharp edges, which are going to be at these transitional states. 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. Add To Cart. The hold position is part of the response that keeps the car from dying when you come off the throttle. Okay, try my method. 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. the issue An under-sized filter will allow part- throttle operation but fuel pressure will drop at WOT and run very lean - perhaps surge under power. If that happens then follow my 10-step process shown above. He said they have been having an issue with these lately. After much diagnosis, I ended up replacing the intake manifold gaskets. The weather in Ct has finally improved and I have put about 60 miles on the car with the Sniper system. Throttle body mounted ECU - no extra boxes to mount. 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. the gas it catches itself and runs fine at slower speeds. It could be, but that seems unlikely.Instead, you need to look at the basics. To start viewing messages, select the forum that you want to visit from the selection below. I went on the good ole interweb and found your website which was VERY helpful! Of the two options, I generally recommend the self-learn. Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). One of the best Ive seen so far. This value is itself enough to raise the idle a bit. There is no real mystery here. If the solutions suggested above are not working then you need to review my article on IAC Testing Procedures. :-). you have it set. From herethe cycle continues and I am He has walked me through every question Iv. Then Friday night as I was driving home, the car started acting up. This software is going to allow you to open both the configuration file and the datalogs that you create, overlay them and you can get a much better idea of what is happening. Did your process to adjust idle to 860. 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 called Holley today, and before I could even described the symptoms the I think that your timing is too retarded. Suddenly, the engine accelerates alone, hears a great deal of air being sucked in, So glad this was helpful. After a stall the car will restart but will be in a high idle. Cracked casing from a side cover screw being installed crossed threaded. 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. Be sure to re-enable it once you get your idle tuned. While confirming, in the handheld ensure that the Reference Angle is set to 57.5 and that the Inductive Delay is set to 100. I have an adapter on the manifold for squarebore to spreadbore and then a phenolic spacer. Shutoff engine wait 30 seconds, turn key wait for display to come up, start engine. And the only way to be positive about that is with a gauge.Unfortunately, the Sniper does not provide an input for an electronic sender so the next best thing is an analog gauge. When running it will only stay in closed loop and learn at idle. As you have noted, each time the idle goes up. Several good bits here. No timing control, coil negative ignition type. I did check for the lightning under the hood but all was well. 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. Yes, having an accurate TPS is very important at idle. These aren't generic newsletters either but instead personalized emails. I watched the butterflies start to open at about 35 on TPS. 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. However, I have what I will call a whistle at a throttle position on 35 - 50. What is it supppse to be at idle and while driving under heavy acceleration? I can tell you that when things aren't working the way you wanted them to work that nothing beats knowing for-sure that you don't have a fuel supply problem. Give that a go and see if you don't make some progress! If the IAC number is increased during this high idle, review the points about high idle from tuning issues. That is likely just confusing the issue.Instead, choose whichever setup most resembles your camshaft and stick with that. Some advanced conceptsIf you have the Sniper Can-Bus to USB Adapter, you can connect your laptop, open the software to the learn table, and get a visual for where in the table you are experiencing the lean bog. Featured Products EFI - Fuel Injection $2.59 - $6,499.95 2179 Products View Parts Sensors You can disable the idle spark control at the locations below. Possibly cap, rotor, coil? No air should be able to pass. Check the Distributor Tach Connection to the EFI. It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. The engine makes very low vacuum at idle. Generally, one of two things: a stuck throttle or noise on the TPS signal. Should i adjust idle screw with the fans already on? The idle is 1350-1400 with the idle screw at initial contact. Thank you. 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. That is certainly not normal! 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. It does this with the engine off. I recommend confirming there is no throttle linkage issue first. Idle was back to normal but iac was at 0. Sniper EFI offers superior throttle response and wide-open throttle power. TP range is normal goes up to about 90% with throttle pedal to the floor. Holley Sniper Iac Delete Commanding the engine to automatically increase speed when switching into drive is a little scary to me though. To figure this out it's going to be important to gather a bit more data. jordan michael merrifield, thomas mangelsen wife, scared straight program near me for 7 year olds,

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