holley sniper efi iac problems

to. 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. If your RPM is 2000, your TPS is 0, and your IAC is not closing, then there is some problem. It meets the target idle perfectly in either but if I lightly stab the throttle it tries to stall after slightly revving. I can have it working fine (5% to 10% at target idle at operating temp.) In fact, it is those users who seem to end up most impressed with the system. You mentioned going from 13.5 to 14.2 but you'd want to go in the other direction--maybe to 13.2. Does anyone have photos of this additional return spring they installed? Look over all of your vacuum lines and fittings. Seems to behave more better now. In the warm state IAC adjusted to a position of 2 to 10%. :-). Switch power to the Sniper on and crank the engine. 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. When I cover it with my hands, it gets quieter. Copyright 2022 Holley Performance Products, Inc. All right reserved. The throttle plates are misaligned. After a stall the car will restart but will be in a high idle. Thanks so much for reading! Kind of cuts into forum time. Is that normal? Drive great and idles perfect at stop signs. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . Good luck! What you are experiencing is rather common. You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? 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. Yes, you are correct. Ive also used another snap on light to confirm. I didn't find your site until I was having trouble. Once it decides to come back down, it does so with no issue. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. Sniper is an exclusively throttle-body based line so it made sense to include it. But as you see from the recent revision I did above you seem to be having a fixable issue. 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. i'm having is I can't seem to get the truck to run faster than 45 mph at speeds An under-sized filter will allow part- throttle operation but fuel pressure will drop at WOT and run very lean - perhaps surge under power. I'm thinking it could be the fuel pressure--- since I have a new Spectra EFI tank and there's been some reports of the interior coating coming off and gumming up the pump however the sniper display DOES NOT show fuel pressure.the Sniper DOES measure fuel pressure on its own - i've confirmed that with holley techs as they told me to purchase the fuel pressure gauge that can just hook up to the 1 wire gauge harness from the Sniper. But nothing beats a good solid gut-check But they are 100% committed to your satisfaction. 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. Then, the next time I cranked it, the idle went high and won't come down!" Also when ac kicks on it will idle down and stall. What should I be looking at to calm this down? Genuine Walbro fuel pumps are virtually bullet-proof. Hello Chris. One additional wrap on the secondary coiled shaft spring is all that's necessary. 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. Shut off the engine, ensure power to the Sniper is switched off. My Sniper started having a ticking noise-- I have 90 miles on my Sniper, but this started the last 10 miles or so: it still drives fine, but it worries me so i've stopped driving it for now. Do you have any clue? 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. Hi I wish I had bought from you but I didn't find this site until now. At that point the tps is pretty high, then shut the ignition off, pull the tape restart the engine and idle goes into hold mode and idle is through the roof. )If you rule out a fuel supply issue then we're going to have to gather a few more clues. There is no sense proceeding until your TPS is at zero at key-on. They also recommended that their ground be spliced into the Sniper ground as close to the Sniper as possible. is jumping all over the place when you experience this condition, it does not Ive tried setting the prime setting above 150 but it wont take, it always goes back to 150. I'll give the ". I readjusted my IAC, now it's perfect. You can manually set it 57 after you run the Wizard if required. 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. Interesting situation you have. back upthe RPMs shoot up to anywhere between 1500 and 2000 and they will not get 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. I would gladly engage with you to solve this but ultimately you are going to need to go through whomever you purchased the system if a warranty return is in order. If you do find you have RFI issues then I've written an . Give us a hand! Thanks for the great question! I'd suggest that you assume everything the previous owner did was wrong until you can prove that it was done correctly. I have it set at 650 and it idles anywhere from 590 to 700. So, this is what it takes to put a Sniper on a small-block Ford. 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! 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. Thanks again for your insights! Thanks, That is an strange situation. Could be a bad IAC motor, replace it and see if that solves the problem. Could you provide me with some things to check or some things to adjust? When the secondary throttle blades are centered in their bores and pivot freely, an additional return spring is not necessary. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. Holley Sniper IAC Surging???? 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. Start with the most gradual throttle input you need to launch well, then slightly increase until you feel some stumble. I would suspect something is coming loose causing a stop to the EFI system/Fuel flow. The last 2 times have been shorter and one time the high idle was around 1400, this time around 1100. Incorrect connections will result in excessive resistance. Then your low idle problem will go away. Hopefully replacing the pump again will resolve both issues. I think you will find that it will learn its way through this. Sniper EFI offers superior throttle response and wide-open throttle power. It's all part of the pleasure of EFI. 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. To do this, open up the Initial Startup gauge screen that was used in section 17.0. I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. Definitely would have went with you guys. It's a Chevy 350 bored .030" over it has a cam in it what I was told is the cam has the firing order swapped. I've not heard of any others with this exact issue so I don't think it is a common problem. Only show this user . Hello. And, hopefully, within those degrees you will find a place where you don't get the whistle. No timing control, coil negative ignition type. I, too, wish you'd bought your Sniper from us! Only in the unlikely event that your engine simply won't run well enough to drive and self-learn should you consider tweaking anything inside of the first several hundred miles. I don't want to go on too long here but once you know if you're trying to add or remove fuel, there are a couple of ways to go. This will let you know at a glance if something is going awry with the fuel pump. It is probably that your RPM above the maximum point at which ramp-down can occur. Please advise. 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!) With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . 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. One of them might be faulty. https://www.youtube.com/watch?v=2JpHlS1ymBc, If this is your first visit, be sure to Duty Cycle% = 3 I have replaced the IAC motor and the problem remains. In most cases the IAC (Idle Air Control) circuit is the source of the whistle. After the start process, If the idle speed is higher than the target idle then the IAC should begin closing as long as the TPS is below 2%. Ive had an idle at neutral as high as 2400 rpm. If the screen shows iac at 0 and you block the hole to find it open what does that mean? If they are closed, check the primaries. knowledge with the sniper efi setup. 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. This is Intermittent meaning, I can run this test 5 times and IAC will function incorrectly 2 out of the 5 times. It appears that I could now use the dongle and a laptop to custom tune for idle issues if needed. engine works beautiful, the car runs a lot, but suddenly, the engine does that. The IAC should display a 2-8% to bring the idle up to the actual target. I installed another return spring for the rear plates problem solved instantly. itself out and hold idleeventually stalling. mail today. Not good.There isn't set solution here that works for all engines. 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. 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. It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. EFI parts, including the throttle body, and the problem persists.Please give me a hand. Also if I give it a On startup- cold or hot, I get a 2 second high idle of about 1500 RPM before normal set idle of 750 RPM happens. 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. The very first thing I would do is get ground truth on your timing. This page was generated at 12:25 AM. I keep doing that with the same result. Not that I noticed. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. Hopefully replacing the pump again will resolve both issuesWhoa. The "Gauge Text" is what would be shown on a 2-1/16 gauge or the Avenger handheld display. If there is an issue with using the Sniper EFI TPS signal, is there a remote TPS or an adaptor for the Sniper EFI that allows the TPS signal to be accessed for the transmission. The data that you provide shows that you have at least two problems. Sniper EFI Tuning & Tech. Doesn't want to start, runs like crap. I put it in neutral and the idle RPM had increased to 2100-2200. And thanks again for taking your time to answer these questions. I installed the Holley Sniper in my Chevelle this winter with a brand new BluePrint 496. Fuel Flow lb / h = 12.1 Cheers Darren. Running a bbc with coil - my timing is perfect. Use the idle speed screw to set the idle at a comfortable warm-up speed. Member List; Calendar; Forum; Holley EFI; Sniper EFI; If this is your first visit, be sure to check out the FAQ by clicking the link above. Part# 538-13. Since the load is more of a wave that increases the most initially and then decreases again, the ECU is doing really well to get the idle under control in only two or three over/under shots as you describe.You don't mention if you have your Sniper ECU controlling timing. By the way your site and your accessory products are nice. These aren't generic newsletters either but instead personalized emails. Get that thing installed and you're going to know a whole lot more about what's going on. I am at the point where I almost insist that every Sniper EFI System owner purchase one of these. Yes, let me know how that setup process works. Chris thank you for the info. That If I put the truck in neutral the TPMS will raise all the way up over 2000. They always responded to my questions with guidance that helped me choose the right system for me. If you go too high then the motor will not return to your target idle when you come off the throttle. You are looking in the right area but I would probably not change the ROC blanking. See these. Advanced throttle body injection systems capable of transmission control and more. It would be possible to set up a 1D or 2D table and do something like this, so if you've gotten into these advanced setups then that would be another thing to check.If neither of these work then I'd recommend that you do a data log of the engine idling as the temperature is reaching and then exceeding 200 degrees. If you see that the ECU is commanding the IAC to 0 but there is air entering the IAC port then it's time to refer to my article on IAC Testing Procedures, Hello,I installed my sniper system on a 65 mustang, with a 302. You're going to have to get this fixed or it's going to cause even more problems than the high idle. (Note: in the original version of this post we had a section about checking the idle speed curve setting. what are allowable deductions against gross income quizlet, the office fanfiction jim saves pam, sims 4 decades challenge cc 1900s,

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