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. It's not necessary to drive it that way. If I go any more it will ping. 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. EFI parts, including the throttle body, and the problem persists.Please give me a hand. IAC Calibration / Hanging rpms | Team Chevelle 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. When stopping, the brakes are unable to overcome the engine so I go to neutral just to stop fighting the engine. It then idles up from 750 to 1100. But as you see from the recent revision I did above you seem to be having a fixable issue. IAC Testing Procedure for EFI Systems I tried adjusting my IAC up to 10deg in both directions with no change. If you go the other way then you might find that the IAC zero's out when the fans are off. That is the IAC hold position. Any suggestions? It's hard to know what the previous owner did right versus wrong. I have installed my Sniper and the car runs great. Please advise. Thank you for any advice. I hold my foot steady in place it does this in 5 second cycles and if i let go of Target AFR at idle is 13.8%. I have seen this become blocked with debris / dirt in the fuel system and cause a high fuel pressure condition . The Sniper resets the TPS to 0% each time that you key the system on. Turning off and then on again, the engine returns to normal. Hi Chris thanks in advance for any tips. 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 While you have over 200 miles on the system, you must realize that in the part of the map where the ECU finds itself during lanches you might only have a total of 5-10 seconds in any given cell. Hi. Then you can take a close look at the IAC and see if it is opening. This increased idle speed is triggered by grounding the orange wire in the 10-pin I/O harness. The problem was RF interferance . Any suggestions would be appreciated. Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. 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. We are running a Sniper on my mates 355ci small block V8 & so far he is very impressed ! It drops about 200rpm when clutch engages. Technically it is a warranty-voiding maneuver so proceed at your own risk. 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. I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. Tuning > Advanced > Adv Idle > IAC Startup And increasing your idle via the idle screw was also a good idea, because that will lower your amount of IAC that is necessary to keep your engine at the target idle speed. Now that you've got your IAC set I'm going to recommend that you run your setup wizard again, which will reset the ECU to the default settings. 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. nothing stays steady. 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. What might cause the TPS to go to 2%? If the TPS is 1% or below then the air is coming from somewhere else. Is this normal ? You are looking in the right area but I would probably not change the ROC blanking. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2 and 10%. Do I need to try taping up the IAC port and setting the idle off the idle screw? The tps has slotted holes, can you adjust it to get to zero? The throttle blade adjustment is at 2-6% at hot idle, and with warm engine 185F. After much diagnosis, I ended up replacing the intake manifold gaskets. If you find that the IAC is more than 8 percent, repeat this process and instead of shooting for 50 RPM below your target make it only 40 RPM below the target idle speed. Usually it wont stay on 0% very long and soon changes to another number like 1 or 2%. 30 minutes later CTS reads 161, start engine Idle is jumping from 450 (almost stall) to 1500, IAC is jumping all over 10 90. Be aware that there is a spring behind there and a diaphragm that you don't want to tear. I've been having problems with my sniper efi just shutting off. Some suggestions: i did have the same problem.try lengthening the lever of the throttle.meaning the length from the center of the throttle to the point where you attach your cable or your rod from the peddle. mean that the IAC is causing it. I'm Having trouble with the Sniper on high Idle. Commanding the engine to automatically increase speed when switching into drive is a little scary to me though. In the Wizard, select the stock cam setting. 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. 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. carburetor setup, but it does blow when I can't jump on the highway like I use $107.95. Well, it turns out that with the current firmware this throws the IAC control into a bit of confusion. After this whole process, the car normally rotates without a very abrupt pedal. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. The first place my eyes go when there is any issue with the idle is to the TPS value. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. 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. 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. Having a TPS that won't go lower than 9% will affect the acceleration enrichment correction, and could create a stumble at the first moment of throttle opening.Yes, the IAC can and will fluctuate depending on changing conditions. Even then, recognize that over time the IAC will need to be readjusted to compensate for minor changes that will cause it to drift. 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 Sniper EFI - Holley But if you will just advance the timing at idle and see if it makes a difference then that will tell you what you need to know. check out the. I have adjusted many settings and eventually mess it up and go back to the original map. The latest was changing the power brake booster.Today I drove it to work and no issues at all. Though it started and ran good, it was dumping fuel and would not lean out to AFR set points. Generally, one of two things: a stuck throttle or noise on the TPS signal. )Then look a the datalog and find out what TPS ROC and MAP ROC is most likely to cause the problem. lower until I turn down the set screw. That is not the way to go. Holley Sniper IAC Surging???? Took it for a lap around the block and came back. I was 20 minutes into a drive yesterday when all of the sudden the RPM increased not commanded. (Grease can sometimes do the same thing as a more permanent gasket sealer without making the removal of the air cleaner such a pain.). The first thing I'd do is check your fuel pressure with a gauge like this. Holley - 543-105 EFI Idle Air Control Motor , Black - amazon.com Sniper EFI Initial Startup and Troubleshooting Staff Writer 01/20/2020 In most cases the IAC (Idle Air Control) circuit is the source of the whistle. But they are 100% committed to your satisfaction. Your task will be to find that. Engine Startup Tuning for Sniper and Terminator X Stealth Owners I have driven car about 200 miles. Cycling the power to the Sniper EFI would cure the problem, but not prevent it from coming back. 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. Could be a bad IAC motor, replace it and see if that solves the problem. All times are GMT-6. Unfortunately I did not buy my sniper efi from you. In that case, and if you have an EGR valve, I might be suspicious of something going on there. Ok, we have enough Sniper systems out there that I thought it would be a good idea to create a posting on challenges that might arise during installation. )If you rule out a fuel supply issue then we're going to have to gather a few more clues. Take it a step at a time. But I can tell you that for most people who try this it introduces so much RFI onto the Sniper that it never works right. I installed the Holley Sniper in my Chevelle this winter with a brand new BluePrint 496. Installed sniper on 65 galaxie. The idle is 1350-1400 with the idle screw at initial contact. It then started working normally again. The fix? You're going to have to get this fixed or it's going to cause even more problems than the high idle. The IAC should display a 2-8% to bring the idle up to the actual target. If you've been running a filter then you have to wonder if you have a legitimate Walbro pump.If you install a new pump and the noise is still coming from the Sniper EFI System then only the dealer who sold you your system can help you. Do you have any clue? 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. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. It starts cold fine, its just when its hot. I have quadruple checked my wiring and am certain it's correct. Find a lower price anywhere and we'll beat it by 5%! I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Did you find this enlightening? If I put the truck in neutral the TPMS will raise all the way up over 2000. 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. Others might require 60 RPM. https://www.gmperformancemotor.com/parts/19210007.html, http://forums.holley.com/showthread.3128#post83128, If this is your first visit, be sure to Relatively new Sniper EFI install on a '69 Mustang 302. 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. Holley EFI Electronic Fuel Pressure GaugeI think its a little ridiculous that I cant see fuel pressure on the display even though its measuring it but whatever. 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. 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. After doing TPS reset it starts fine but when you give it some gas it hangs at 1500 and will not return to idle. Am I missing something. 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 would continue checking the electrical connections along the fuel supply. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. That will happen occasionally, but less as time goes and on and the engine tune stabilizes. Your AFR is pegged lean. Stupid question, but where do I see if it's entering Learn mode? You are aware of the idle-up problem. 34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. What you are experiencing is rather common. The window you saw in the image above pops up. This will let you know at a glance if something is going awry with the fuel pump. Holley EFI 543-105 Idle Air Control Motor Okay, try my method. Take a drive and stop somewhere for 30 minutes, CTS is 170 when engine was shutoff. to. ps. Incorrect connections will result in excessive resistance. If not then I think you are going to find that this will solve much of your problem. After a complete cool down it will do the same thing. The answer will divide the possible sources of additional air into two, greatly simplifying the problem.If the IAC number has not increased, then review the article above regarding high idle from a vacuum leak or high idle from sticking linkage. Hello 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. 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. I very pleased with the performance, it is a huge improvement from the 800CFM carb I had on this motor. Please help. Give it a watch: https://youtu.be/7SO7-tZn6iw. Just add 5 or 10 degrees of advance and see if it doesn't idle better. From herethe cycle continues and I am I have been reading these posts and have learned a lot. 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. Once we recognize that, the next step is to narrow down all possible sources of additional air until we discover the cause.Start by keeping an eye on your IAC number. Suddenly, the engine accelerates alone, hears a great deal of air being sucked in, I have a bone stock 350 that I installed a Sniper on and had the same whistle noise, presumably from air going past the butterflies. Either the Walbro pumps you are getting are not genuine (lots of forgeries being sold) or else you have something that is killing them. 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%. The data that you provide shows that you have at least two problems. At that point, with 90 PSI of fuel, the ECU can't turn the duty cycle down low enough to idle properly. The engine runs beautifully, with perfect idle at 650 RPM, but every now and then I hear the IAC give a sort of "snap" and the idle is at 1200 RPM. Two things to keep in mind as you do that. Duration @.050 is 240 intake 246 exhaust with .574/.578 lift. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. If the connection is loose it will cause the system to shut fuel off because the signal telling the EFI the motor is turning stops (to prevent excess fuel from being dumped in the motor). Have you checked your fuel filter and made sure it's not plugged?If both of these are okay you're going to have to find a way to monitor your fuel pressure while under load. The fact that it ran so (at times) with 90+ PSI fuel pressure is a testimony to the Holley's closed-loop technology. I recommend confirming there is no throttle linkage issue first. When the idle speed screw is turned all the way out there should be just enough room between the bore and the blade to catch your fingernail. and when I close the IAC's hole with his finger, the engine is normal.The data on the touch screen I see are:AFR, A / F = 35.6 I did read some comments on regulator issues is there a way to check it for an issue ? I have tried your 10-step idle adjust and ive adjusted the idle curve. Hi Chris I didn't get any traction on Holley.com Thanks so much for reading! About two minutes after I get it set at 850 & 5%, it has progressed to 100%. It is a common one. 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. I started with right after I first adjusted for 2% IAC and took pics about every 30 seconds over about 2 minutes. Overview. You may have to register before you can post: click the register link above to proceed. New install, when in setup wizard TPS says 90 percent and I checked the linkage and butterflies. 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. The problem I'm having is I cant get the IAC to drop down off 100%. Sniper EFI Update: Weeks Later, Do I Still Feel It Was Worth It? 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. Have you ever experienced a high idle once the engine reaches 200 degrees?Ive set my idle the way you said and it works great until the engine reaches 200 degrees. 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! Do please let us know what you find out! Thanks for any help. Ive also used another snap on light to confirm. 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. Advanced throttle body injection systems capable of transmission control and more. I did change the -40 thing also. :-)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. Hello. If more info is needed just ask. EFI Troubleshooting EFIand and EFI Tuning Tips - In The Garage Media All times are GMT-6. Hey Chris!
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