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You are aware of the idle-up problem. When the system is up and running the fuel pressure regulator inside the Sniper is making a rattling sound like a shaking a paint can. So glad this was helpful. Once you confirm the operation of your IAC then it's time to read my article on Solving RFI Problems. If you go too low then it may stumble or even stall when coming off of throttle. Nice to meet you. If you find that adding 5-10 degrees of advance helps then it's time to do reconfirm TDC. 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. Sorta similar to a carb having the idle mixture set incorrectly (rich) or the idle speed too low. All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. We offer some tips to help with that. It may take a few tries. This increased idle speed is triggered by grounding the orange wire in the 10-pin I/O harness. 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. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. Based on your situation above as well as some of other experiences, I recognized that I needed to improve my tuning procedures above to better explain what steps to take if that 10-step process doesn't completely solve the problem. 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 was 20 minutes into a drive yesterday when all of the sudden the RPM increased not commanded. Yes its at 95lbs, needless to say he promised a new regulator would be in the Turning it off and back on would reset it, and then it would work as advertised for a while. Very annoying ended up being simple my rear plates would stay open constantly it was driving me nuts I'd let off the pedal idle at 1300 blip the throttle a few times finally come back to 850. Copyright 2022 Holley Performance Products, Inc. All right reserved. And if you're going to go this route I'd recommend that you switch from "Simple" (3 A/F targets, one each for Idle, Cruise, and WOT) and go to the 2-D Table 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. However based on your reply I connected the Fuel Pressure gauge and Sniper EFI offers superior throttle response and wide-open throttle power. Definitely not 90. Resistance results in heat and heat results in more resistance. Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? Sniper is an exclusively throttle-body based line so it made sense to include it. Intermittent stalling usually points to radio frequency or electro-magnetic intereference (RFI/EMI). That is not something I'd ignore. So what--you're never going to drive in minus 40 degrees, right? Good luck! It has gotten a little better after I drove it for three hours today.I want to save the Kik because if I get this working good then I would like to add A C and use the kick for it.Motor is Mopar 360 with mild cam and automatic. Jun 12, 2021. Hello Chris. Your issues are likely related to one of these two things. During after-start idle, the idle will jump up to about 70% if the engine is cold, stay there about 4 seconds and then ramp down to the target idle speed for the current engine temperature. If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. I also tried changing roc/map to 8 from 15 again no change at all.My ve table is smooth and tuned I even changed my AFR to 13.5 from 14.2 and no change at all. Holley Sniper Iac Delete Give it a watch: https://youtu.be/7SO7-tZn6iw. Between the kick down and the return springs on the throttle body the pedal is so hard to push it's pretty much a jack rabbit start every time from stop, it's almost undrivable, any suggestions on what I could do?thanks for help, I've tried both Holley's tech lines for close to 2 hours with no answer! I certainly appreciate your frustration (as well as your wife's!) Holley Sniper IAC Surging???? A problem since day 1 - YouTube By the time I was near home, the idle in Park was 1050, IAC 0. That's what you're seeing. We'll also be contacting you for future purchases now that I've discovered you! While adjusting the screw if the TPS position reads begins to read higher than 0% cycling the ignition switch will recalibrate the TPS back to zero. 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! Could the IAC be broken/malfunctioning? Both Sniper and trans controller grounds were direct to the battery ground, as they should be. Data logs show no EMI/RFI. My Sniper is 99% great! So try changing your IAC hold value slightly:Tuning : Advanced : Adv. Hi Chris thanks in advance for any tips. It won't take much! I drove it a bunch more yesterday afternoon/evening and the same thing happened several times. With the engine still idling high park, set the brake, open the hood, and remove the air cleaner. Bolt on 4150 Flange Carburetor Replacement. It will drop down to 400 RPM then climb 500 and then shoot to 900 and then come back sometimes two or three times then catch it self an idle just fine again. That is what I really respect about Holley. Ive played with the timing on this thing multiple times.Car was fullly restored last year. I'd suggest that you assume everything the previous owner did was wrong until you can prove that it was done correctly. Target AFR, A / F = 13.5 As soon as I got the new one installed and wiredit fired right up and did everything it was suppose to do with no issues. Then a little faster--until bogs at that level work themselves out. In the warm state IAC adjusted to a position of 2 to 10%. 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. IAC Pos.% = 0 That initial rev is going to be determined by your IAC Park Position. Thank you for your input. The problem was RF interferance . Part# 538-13. Bottom line ismy first one must have been faulty. Be sure to re-enable it once you get your idle tuned. Sniper EFI Problems - Holley Performance Products Forums Holly offers a very nice Analog-Style Fuel Pressure Gauge that is another option. My car will now start when its cold, but after about 30 seconds the idle drops down and begins to run like crap. To get it to idle the tps is at 2-3-4% even with linkage disconnected and a return spring installed. At low levels RF interference will often reset the ECU so quickly that the engine will not stall. If this is the case then some adjustment of the linkage or the butterfly plates themselves is necessary. If I go any more it will ping. I will try the other stuff when I get off work. The distributor was loose. 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. These will fix the noise but if the performance is suffering then likely you won't see any difference since it is not likely to be related to this sound. Full product line and accessories at excellent pricing. Please give this a try and let us know how it works! Sniper setting is Stock camshaft. Even though you think your timing is perfect I'd suggest you try cranking about 5-10 degrees of advance into the distributor and just see if that doesn't work better for you.Remember this: adjustable timing pointers go out of adjustment and harmonic balancers slip. :-). The throttle position should be zero. Glad to hear that things are working well! May God's grace bless you in the Lord Jesus Christ. If you remove the air cleaner entirely and the whistle continues then you can rule that out. But they are 100% committed to your satisfaction. It meets the target idle perfectly in either but if I lightly stab the throttle it tries to stall after slightly revving. 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. You could go either way.. Also what would you say a desired idle should be for a 3 speed automatic ford? Learning to install these is great--you're about to embark on the next great adventure of advanced troubleshooting. These aren't generic newsletters either but instead personalized emails. My dad wanted to recheck the timing so I set the Static Timing at 15 and it runs perfect. Tuning Your Sniper EFI System for Progressive Secondary Link Use I hold my foot steady in place it does this in 5 second cycles and if i let go of After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. Yes, you are correct. 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. 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. Holley Sniper EFI Self-Tuning Master Kit - Black Ceramic Finish My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. Note that sometimes you can get into a back-and-forth situation. mail today. If your fuel pressure regulator has failed (and they often fail by blocking return fuel and maxing your fuel pressure) then it could lead to rich idle, particularly until your engine gets up to temp.