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Your task will be to find that. Should i adjust idle screw with the fans already on? Follow this link to download it for free if you have not already done so. Simply turn the idle speed screw on the linkage in until the throttle plates open enough for the idle to increase. If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. P.S. Adding a wrap to the return spring on the shaft is one alternative to solving this. Am I missing something. Except at idle. It's pretty hard to get the header tubes glowing at idle with a lean AFR. The very first thing I would do is get ground truth on your timing. After pumping the pedal a few times at different times it dropped to zero and started to work. 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. idle counts from 0. The Sniper EFI remote IAC (Idle Air Control) and plug is designed to gain installation clearance on some Sniper EFI 2x4 installations. The "PC Text" indicates what will be shown on the PC/Laptop data monitor or data logger. 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. If it does then you can put on a heavier spring so the advance doesn't come in as fast, or use a lighter weight. When running it will only stay in closed loop and learn at idle. My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. Maybe Holley will add Fuel Prime Multiplier to Terminator X later. :-)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 is how the engineers allow you to clear a flood condition when you detect it. The Sniper EFI system looks at the closed-loop fuel compensation required to reach your target AFR. Unfortunately I did not buy my sniper efi from you. It only comes back to normal if I turn the engine off and on again. Hot start it most of the time wont start unless I give it a little throttle. Also when ac kicks on it will idle down and stall. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. Really appreciate the amount of learning im getting off here. Getting the throttle blades and IAC to work together will keep your fuel injected hot rod running smooth and predictable. I' m going to put the 3 rd new pump this coming friday. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. You might have a bad IAC, but you can also have a bad vacuum pod on the transmission. I have a Holley Sniper for almost 11 month now and it was running fine with no problems until now. (If you do this you will need to reset the -40 degree setting mentioned at the top of this article. I took some pics of the sensors page this morning after the car warmed up. FYI: Car is a 1970 Mustang 302 Ford Racing roller motor. 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. NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! May God's grace bless you in the Lord Jesus Christ. 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. The first place my eyes go when there is any issue with the idle is to the TPS value. 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. The data that you provide shows that you have at least two problems. That is likely just confusing the issue.Instead, choose whichever setup most resembles your camshaft and stick with that. I used the Casper's Electronics 108103 splitter and carefully soldered my connections. This is normally used as an A/C idle-up circuit. If you feel you have no other choice but to run a Sniper and stand-alone controller then you can give this a try. Ultimately, it is about making the pedal softer, particularly at initial throttle opening. Reply Quote. I have a Holley Sniper EFI with HyperSpark ignition. nothing stays steady. But when you have it then you can look for exactly what the IAC is doing at that point, and if there is anything that might lead to this happening. So what--you're never going to drive in minus 40 degrees, right? When this occurs, I sometimes can shut it down and it will return to the correct settiings. That, I am afraid, is going to involve a little bit of luck if you don't want to create a 250 MB data log. The timing can drift 0-30 degrees just due to the width of the rotor tip. Short drives is fine then it'll In most cases the IAC (Idle Air Control) circuit is the source of the whistle. If I block off the iac with tape , I can get it to somewhat idle, but its not consistent. I started with right after I first adjusted for 2% IAC and took pics about every 30 seconds over about 2 minutes. Ilike a few othersam having idle issues. Enjoy! If you have any questions about the car/setup let me know. It won't take much! May God's grace bless you in the Lord Jesus Christ. I believe that you have this problem solved now with your new inline filter/regulator. Ive played with the timing on this thing multiple times.Car was fullly restored last year. The fix? When the secondary throttle blades are centered in their bores and pivot freely, an additional return spring is not necessary. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. Your issues are likely related to one of these two things. I did read some comments on regulator issues is there a way to check it for an issue ? He is able to get it to start by quickly depressing the accelerator to at least 60% and releasing. Hi Chris I didn't get any traction on Holley.com Chris---I am contemplating replacing my Holley 750 on my new low vacuum 600 HP 496 with the Holley Sniper FI system. One of the best Ive seen so far. By the way your site and your accessory products are nice. What can I do? I was 20 minutes into a drive yesterday when all of the sudden the RPM increased not commanded. If either of these is not the case it must be remedied.After you have done this then you might want to involve Holley Tech Support about the TPS, or it may be easier/faster just to visit the local auto parts store and pick up a new TPS and install it. You will need to change the -40 degree idle speed setting again but I recommend not touching anything else. If I cruise down the road at lets say 60 mph and lay into it, she will take off and go. They also worked with me on a sale I missed and price matched those parts. One thing you need to sync the timing and set the inductive delay. No, the idle speed curve setting isn't something that you normally worry about--and especially not down at minus 40 degrees farenheit. https://www.gmperformancemotor.com/parts/19210007.html, http://forums.holley.com/showthread.3128#post83128, If this is your first visit, be sure to EFI parts, including the throttle body, and the problem persists.Please give me a hand. This only happens when coming to a stop and the idle is ramping down to the set idle RPM. Relatively new Sniper EFI install on a '69 Mustang 302. If the TPS reading on your Sniper EFI System does not reset to zero that is a problem that needs to be addressed. This page was generated at 12:26 AM. Hello, I am having a tps and idle issue. I managed to get the IAC down to around 0% - 8%is this good? These problems will go away when you do that. Running the vacuum advance and of course I time it disconnected. IAC is good 0-5% most of the time. 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. What I would recommend is getting somewhere that you can spend a significant amount of time doing starts. To start viewing messages, select the forum that you want to visit from the selection below. What I can't explain is why your TPS is acting so randomly. I would continue checking the electrical connections along the fuel supply. First, let me congratulate you on your patience in letting the system learn. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. Engine warms up to 195 degrees and stays. I have probably 200 - 300 miles on this engine and it has always done this. It will learn the fueling eventually either way, it's just that one might get you there a little faster.If the idle is fine at start-up but then increases after you depress the throttle then you might need to lower your IAC Hold Position a bit. I think you'll be all set! I've been having problems with my sniper efi just shutting off. Going back to what you said. The biggest issue is these problems are intermittent meaning they do not occur all the time. normal city driving, I no longer have other problems I had with the original 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. Good In some cases, you may only be able to put as little as 10 RPM between the hard idle and the target idle. But I wanted to go ahead and answer this so that it would make sense to someone who might not go that route.I think the first thing I'd do is try another pressure gauge. However, it is a good question so I thought I'd throw a few bits of info out there that I think might help.First, I believe that you may have a basic misunderstanding of what is being referred to sort of generically as AFR. Capability Range: Advanced 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. 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. I went on the good ole interweb and found your website which was VERY helpful! A problem since day 1 - YouTube Leave a comment if you've had this issue and how you resolved. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. It's not necessary to drive it that way. 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. As I said I didn't buy from you so you don't owe me anything. Pricing was reasonable, shipping was prompt and Chris helped me with a wiring question during my install. I've not heard of any others with this exact issue so I don't think it is a common problem. There are a few tell-tale signs that can help you diagnose the problem. Yes, it will talk to you--but not with words. Chris I am having a little different idle problem I did your -40 thing and that help with high idle but my problem is it idles fine until I drop it in gear and it stumbles a couple times catches up and then idles fine again. Price Point: $$, EFI Systems based on Holley's world-class Dominator and HP ECU's. I keep doing that with the same result. 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.