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I have driven it a few times maybe 100 miles or so. I've been messing around for a bit trying to eliminate any possible vacuum leaks. Bolt-on carburetor style EFI for your classic car or truck. 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. P.S. I'll bet you find that you can get it working great without any manual tuning. Then, the next time I cranked it, the idle went high and won't come down!" Great work, expert! You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. Please check your process again and see if you can see very specifically what is not working correctly. Super helpful and knowledgeable. Holley Sniper How To Set The IAC (Idle Air Control) in 5 - YouTube So you installed your Holley Sniper. 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. He has walked me through every question Iv. is train the system or there is actually something wrong.I do love the system at your IAC is at zero. I also noted that after some time, I could change those values as I saw fit. In some cases, you may only be able to put as little as 10 RPM between the hard idle and the target idle. Next, clean the IAC and all related parts with brake cleaner. Thanks for any info./insight you can provide, Mark. I appreciate everything you are saying. 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. It is always best to get the base map as close as possible before adding acceleration enrichment. To be honest, you sound like an ideal candidate for Sniper ECU ignition timing control. So I have been doing the slow take offs and thinking that it would learn its way out. Try it! datsun sniper efi Holley RetroBright This 1974 Datsun 620 Bulletside Cruises With The Help Of Sniper EFI Bradley Iger 01/13/2023 features Latest News sweepstakes 2023 Hemi Engine Sweepstakes Gen III Hemi Enter To Win Holley's 2023 Hemi Engine Sweepstakes For Your Chance To Win A 600+ Horsepower 392 Stroker! The 5-6 times it has happened now have been after the car has been running for at least 20 minutes. ?I never had my Carb Cold start RPM any higher then 1600 RPM.THANK YOU. It could be that you've left a vacuum port unplugged, it could be that the throttle plates are misaligned (unlikely), it could be that your IAC is not closing properly. A simple remove & clean will remedy this . ChrisI finally got everything resolved. me know how it works for you. It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. If that happens then follow my 10-step process shown above. first attempt but as it tries to idle down to the target RPMsit can never even Advanced throttle body injection systems capable of transmission control and more. With an assistant pressing the accelerator, you need to make sure that when the accelerator is pressed to WOT that the throttle blades are fully opened, and when accelerator is lifted the linkage is fully at rest against the idle speed screw. And your understanding of how the throttle position affects idle is exactly correct. Camshaft is M-6250-B303 .480 lift intake & exhaust, duration at .050 is 224 degrees for intake & exhaust. Sniper EFI offers superior throttle response and wide-open throttle power. The team at EFI pro are some of the best I have ever dealt with when coming to ordering parts or having the knowledge to answer any question you may have. 63 bomb I can have it working fine (5% to 10% at target idle at operating temp.) 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!) And your question is very perceptive: You must first know whether the bog is a lean or a rich condition before you can make the correct adjustments. After pumping the pedal a few times at different times it dropped to zero and started to work. idles good, runs amazing. Since a key cycle resets it to 0 and out to 30 or wherever Turned it off and on again. In your case, however, I think you're close to getting it running. This may sound crazy but I'm going to jump out on a limb here and say you don't have an idle issue--you have a timing issue. In the time it takes to add your email address you can be at the top of the heap for getting the latest information from our authority. No power at the programmer and no fuel pump running. I watched the butterflies start to open at about 35 on TPS. If that tested out okay then I can really guess that there might be some sort of intermittent, temporary RFI. Watch videos on installation hints and if you haven't yet, download & read every Sniper installation guide you can find online. 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. Capability Range: Advanced There's nothing wrong with manual tuning, but at this point that is just compensating for an inadequate fuel map. So as much as I can I have been taking off real slow and let it fall on itself to try to learn and its not learning its way out of it. 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. Thanks for sharing that, Jason--great info! This page was generated at 12:25 AM. Holley Sniper high RPM - IAC problem? At some point you come upon problems that evade the easy answers and this is a good example. This curve turns the idle speed down as the engine warms. Then Friday night as I was driving home, the car started acting up. The next time it happens is the perfect opportunity to find the problem. What is it supppse to be at idle and while driving under heavy acceleration? Simply turn the idle speed screw on the linkage in until the throttle plates open enough for the idle to increase. I am Japanese who attached Sniper EFI. If I go any more it will ping. carburetor setup, but it does blow when I can't jump on the highway like I use Changing the rpm curve and target rpm has no effect. Give them a call and if they are unable to provide customer support the contact the Holley tech support line at 1-866-464-6553. I have certainly seen this before on other fuel injected vehicles when hot. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. Drive great and idles perfect at stop signs. It may take a few tries. 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. 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. At this time, TPS is 0%, IAC is 50 to 60%. Wish I had bought my sniper from you, but unfortunately didnt. Ok, so I'm stumped! Add To Cart. Relatively new Sniper EFI install on a '69 Mustang 302. The latest was changing the power brake booster.Today I drove it to work and no issues at all. Should i adjust idle screw with the fans already on? After much diagnosis, I ended up replacing the intake manifold gaskets. Have you confirmed your fuel pressure at idle is 60 PSI? So check that timing and I think that you're going to find you need a good bit of advance. We're having trouble with a Ford Maverick 302 V8, using ethanol. You could install the Holley Dual-Sync Distributor and let the Sniper control your timing. Technically it is a warranty-voiding maneuver so proceed at your own risk. Holley Sniper IAC Surging???? Reducing that a bit will help. Holley Sniper EFI Problems: Best Fixes According to Manufacturer Switch power to the Sniper on and crank the engine. In the warm state IAC adjusted to a position of 2 to 10%. 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? 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). Yes, let me know how that setup process works. 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. Ensure that the secondary linkage is completely closed (both visually and manually.). Kind of cuts into forum time. (Don't drive and watch--get a helper!) Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish No matter what do, my idle will not drop below 1350-1400 RPM when the engine warms. The noise changes sound with the throttle position. Otherwise, if removing the air cleaner eliminates the whistle then try to use a thicker gasket or try lightly greasing the gasket. I installed the Holley gauge you suggested in another thread at the fuel input to the TBI, and the fuel pressure is constant around 64 according to the gauge. )So before I hook up another gauge to see if the Auto Meter is bad (assuming I can find a 0-100 test gauge in my shop). Don't make any changes more than about 10% and keep the same basic shape as the original (High/flat below 20 degrees, sloped downward up to 180 degress, and then flat again above that.) 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. 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. Ok, so there are a couple peculiar things going on here. 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. Keep in mind that at 60 miles the 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. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. 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. :-). As you see above, the Sniper is going to dump in a maximum amount of fuel at zero TPS, begins to remove acceleration enrichment at 60 percent TPS, and then removes all acceleration enrichment correction at 100% TPS. I hope everyone enjoys this v. It then started working normally again. Hi Chris , greetings from Down Under (AUS) Just a note on the hi fuel pressure issue . It's all part of the adventure! So what--you're never going to drive in minus 40 degrees, right? Look over all of your vacuum lines and fittings. I have driven car about 200 miles. It is reliant on the data acquired by the included wideband oxygen sensor. I keep wondering how it was running so good with Thank you so much for your follow-up. By the way your site and your accessory products are nice. Contact whomever sold you your system or Holley directly. Handheld shows plenty of fuel so I dought it's an issue there. Does that make sense to you? Any suggestions? If you have performed the adjustments above and still have RPM issues, it's time to look for clues. Yes, having an accurate TPS is very important at idle. 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. have the system learn the higher speeds? 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. If you have any questions about the car/setup let me know. Start with the most gradual throttle input you need to launch well, then slightly increase until you feel some stumble. At 0% it shouldn't be sucking any air through that port, correct? Thanks for the info Chris. But as you see from the recent revision I did above you seem to be having a fixable issue. other things that might cause the idle to faulter, but this is a good start. $107.95. Anyway I have a 327 sbc in a 1987 Monte SS with a T5 5 speed and 3:73 posi rear. Duration @.050 is 240 intake 246 exhaust with .574/.578 lift. You are aware of the idle-up problem. I'm happy to walk you through what is required. What would cause the idle to faulter like that? 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. Holley Sniper IAC Surging???? A problem since day 1 - YouTube All times are GMT-6. Give it a watch: https://youtu.be/7SO7-tZn6iw. 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. Also its extremely rich at idle. I' m going to put the 3rd new pump this coming friday. Does anyone have photos of this additional return spring they installed? Shut off the engine, ensure power to the Sniper is switched off. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Get On The List for Emails Straight From Our Pro? Plus, you can email that file to me and I can be of more help. I'd recommend you contact Holley Tech support to get their input (1-866-464-6553; call early for the shortest wait times.) I have not heard of this. This is more of a bit of a reality check. 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. Let me start with the engine not starting until you press the throttle. Good luck! Also ensure the TPS Position returns to zero at idle, & the IAC Hold Position isn't setup too high. to. 3 different fuel pumps. It's called tuning. Learning to install these is great--you're about to embark on the next great adventure of advanced troubleshooting. Hey Tommy, we've got at least one thing in common. Chris, How can I adjust the startup speed down to about 1400 RPM? 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. The throttle position should be zero. I have quadruple checked my wiring and am certain it's correct. That is certainly not normal! I received from the controller manufacturer greatly understates (at best) the repeated failures of others I know personally who have tried and failed. The last 2 times have been shorter and one time the high idle was around 1400, this time around 1100. Sniper EFI Initial Startup and Troubleshooting Staff Writer 01/20/2020 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. Turning off and then on again, the engine returns to normal. Find a lower price anywhere and we'll beat it by 5%! I have adjusted many settings and eventually mess it up and go back to the original map. Then you can take a close look at the IAC and see if it is opening. It could be, but that seems unlikely.Instead, you need to look at the basics. Definitely would have went with you guys. Coming home from work today it was much warmer and took a little longer due to traffic. Your task will be to find that. Ive played with the timing on this thing multiple times.Car was fullly restored last year. Sniper EFI Problems - Holley Performance Products Forums Just thought I'd ask as there isn't a lot of info out there. However based on your reply I connected the Fuel Pressure gauge and Hello Chris. One additional wrap on the secondary coiled shaft spring is all that's necessary. Could be a bad IAC motor, replace it and see if that solves the problem. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. Cracked casing from a side cover screw being installed crossed threaded. I readjusted my IAC, now it's perfect. I recommend confirming there is no throttle linkage issue first. It really takes a lot of throttle tip-ins before you get anywhere near "learned" in this part of the fuel map.Based on your description, it sounds like you have a lean stumble. Any ideas here? When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. I did buy the Sniper from you guys and the service was fantastic. It's hard to know what the previous owner did right versus wrong. I have an entirely separate article on Solving RF Intereference Issues. Jun 12, 2021. I have changed my roc/tps to 7 from 15 but that only took me out of learn mode. It reads 0 at idle and when I accelerate it goes up to 30 and makes a loud sucking sound that seems to be holding the car back. When the lambda is 1.0, the displayed AFR is 14.7;1 REGARDLESS OF THE FUEL. any ideas? Pw. So I had my Idle set up perfect, with idle timing control off and engine hot the IAC was right at 2-4%. I will confirm TDC with balancer but I have had balancer off and timed it before and after with same results. If I rev the engine a couple times in neutral it will finally return to idle & usually will not do it again for the rest of my trip. If your TPS has snuck up to 2% then your IAC will be at the hold position, which by default is 30%. However, I have never found that to be the case. )Then look a the datalog and find out what TPS ROC and MAP ROC is most likely to cause the problem. With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . To do this, open up the Initial Startup gauge screen that was used in section 17.0. 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. 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. Running the vacuum advance and of course I time it disconnected. I installed another return spring for the rear plates problem solved instantly. i'm having is I can't seem to get the truck to run faster than 45 mph at speeds When this happens, it is impossible to convince the Sniper ECU to allow the RPM to drop below a set RPM--regardless of what the target idle speed setting is. OK, I did the baseline idle speed screw setting. Explained: Holley EFI Sensors and What They Do One of the great features of Holley's Sniper is the ability to set your air/fuel ratio (AFR) where you want it. I have tried your 10-step idle adjust and ive adjusted the idle curve. My primary reason for going EFI was drive-ability, (Startup and take off without waiting for the engine to warm up) and not have the occasional hesitation a carburetor has especially just barely opening the secondaries. 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. Generally, one of two things: a stuck throttle or noise on the TPS signal. (It should be at or near 60 PSI at idle. Or ?I have put a fuel pressure gauge right at the inlet of the sniper and it is reading 60-64 psi. Once you confirm the operation of your IAC then it's time to read my article on Solving RFI Problems. Your issues are likely related to one of these two things. I, too, wish you'd bought your Sniper from us! Idle when warm was 850-ish and IAC 3-4 just as when I readjusted it the night before. After a stall the car will restart but will be in a high idle. 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. I have seen this become blocked with debris / dirt in the fuel system and cause a high fuel pressure condition . The problem I experience is that after driving for about 10-15 minutes, the car starts idle to high. check out the. I put sniper on in hopes to be able to just turn key and start without fumbling with pedal to keep it going and to correct idle drop when ac kicks on.