Therefore The iac will always be at 10% now, correct? One of them might be faulty. It works instantly for him.If that fixes your problem then you have a starting place. That's what you're seeing. Take it a step at a time. I can get it to fire up on the SNIPER EFI TO HOLLEY DUAL SYNC HARNESS Part# 558-493 $34.44 Qty: Add To Cart Idle Air Control Motor Replacement Idle Air Control (IAC) Motor for Sniper EFI TBI Systems, Sniper 90/92/102mm Throttle Bodies, Terminator TBI, Avenger 4bbl TBI, HP 4bbl TBI, Commander 950 & Digital Pro-Jection Systems Part# 543-105 $71.72 Qty: Add To Cart 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. My issue is that the TP% will not reset with key cycle and its idleing at 9% TP. I straightened that out, got it running and that's where it goes downhill. It is a common one. I' m going to put the 3rd new pump this coming friday. A couple of those and you should feel it getting better. I managed to get the IAC down to around 0% - 8%is this good? 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 go too low then it may stumble or even stall when coming off of throttle. If you haven't installed a This curve turns the idle speed down as the engine warms. So, clearly, the "No" answer is wrong. is the fuel pressure. Chris, I recently installed my Sniper and have an intermittent idle problem. I will turn it up some. 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 The noise changes sound with the throttle position. Once it decides to come back down, it does so with no issue. Overview. I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. This minimizes installation time and packages really well on a diverse group of engine applications. If there's any run time on your current setup the Sniper may have some bad learn data due to what appears to be timing issues. Maybe give it a half-turn before you start it and then start and tweak. When you first posted this I had no idea how to respond. I installed my Sniper and the engine fired up great. :-) Just don't let the parts go flying. First, recognize that the IAC and the TPS are not inter-related in any way. Do please let us know what you find out! Be aware that there is a spring behind there and a diaphragm that you don't want to tear. First, check to make sure that the IAC is properly mounted and connected. It meets the target idle perfectly in either but if I lightly stab the throttle it tries to stall after slightly revving. Should the iac% fluctuate? The jack-rabbit start can usually be minimized by adjusting the throttle linkage. Don't be surprised if one or the other is slightly open. is train the system or there is actually something wrong.I do love the system at Ive had an idle at neutral as high as 2400 rpm. Initial thought is timing but Im running a cd box and the ecu is not controlling and I did not physically change it during the install. The fix? 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. The tps will not auto reset to zero. 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. It is easily solved by installing a four-hole gasket or four-hole spacer (depending on your hood clearance issues.) There is a chance that the IAC is open but displaying 0% so start by putting your finger over the IAC opening. Holley have given a new unit. is jumping all over the place when you experience this condition, it does not This will let you know at a glance if something is going awry with the fuel pump. I recommend you have a look:https://www.efisystempro.com/efi-pro-hangout/holley-sniper-efi-instruction/solving-sniper-rfi-problems, I recently purchased your fixed linkage to open primaries first and the throttle linkage extender to also get a smoother pedal. engine works beautiful, the car runs a lot, but suddenly, the engine does that. This value is itself enough to raise the idle a bit. 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. Now, in my lifetime of experience with Holley ECU's that seems unlikely, but this guy sounded really sharp and had nothing to gain by convincing me of his dilemma. If so remove it. I pulled over and turned the car off and then back on. Ive also used another snap on light to confirm. The resulting resistance can burn up fuel pumps, wiring and relays. Use the idle speed screw to set the idle at a comfortable warm-up speed. While this video is not meant for the Sniper EFI user it does provide a great overview of how your ethanol tuning adjustments must be made not only to the base fuel map but to the other configuration settings. 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 data that you provide shows that you have at least two problems. Since a key cycle resets it to 0 and out to 30 or wherever When I drive with warm engine the IAC is at 30% when pushing gas, but shouldn't it be at 0%? 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. No matter what do, my idle will not drop below 1350-1400 RPM when the engine warms. idle counts from 0. and go to restart warm, it catches starts for a flick of a second, drops to a stall, or sometimes will catch its self and start. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. Bolt-on carburetor style EFI for your classic car or truck. My Sniper is 99% great! When stopping, the brakes are unable to overcome the engine so I go to neutral just to stop fighting the engine. 1. I'll have to check again tomorrow. I'm compltely stumped and my wife is certainly upset I'm spending so much time between the garage and the computer for something that should basically run out of the box. I have it set at 650 and it idles anywhere from 590 to 700. 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. They are prone to be inaccurate. carburetor setup, but it does blow when I can't jump on the highway like I use Honestly, I've never seen this happen but if the butterflies were misaligned on the shafts it could allow too much air to enter. I had that problem, right out of the box it would not power up, sent it back in, had defective hand held. If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. It didnt do this with the carb on it. I installed another return spring for the rear plates problem solved instantly. If I'm driving along and pull up to a light and leave it in gear it idles just fine but it seems not to be able to compensate if I put it in neutral and then back and drive. I used the Casper's Electronics 108103 splitter and carefully soldered my connections. Good If you do find you have RFI issues then I've written an . That is not something I'd ignore. Get On The List for Emails Straight From Our Pro? Which means you either need to increase that number or increase the ramp decay time. I keep wondering how it was running so good with What should I be looking at to calm this down? If the TPS is 1% or below then the air is coming from somewhere else. Without it you are working in the dark. idles good, runs amazing. When running it will only stay in closed loop and learn at idle. 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. Not to bandstand here but this is the point when where you bought your system is so important. So I have been driving it for about 400 miles now to numerous car shows and going out for cruises around town, trying to work some of the bugs out from everything we did this winter, but I notice when I take off from a stop sign or I cruise at a very low speed (say30 mph) it seems to be very boggy from no throttle to about 1/8th throttle. Another suggestion is to add an extra turn to the spring built into the linkage to increase the closing force on the throttle shaft. Interesting situation you have. If you have somehow overlooked this, start here: Holley Idle Speed Adjustment Instructions: Once the engine is up to operating temperature, the idle speed can be set to what was configured in the Wizard. What can I do? But now that Terminator X is available, I highly recommend going that route. 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. Cracked casing from a side cover screw being installed crossed threaded. As far as the timing light, I don't know, because I was having problems getting it to work, and that's where I stopped. ChrisI finally got everything resolved. 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. Then do it just a bit faster--just enough for it to bog a bit. Is there away to lean the idle out? Two things to keep in mind as you do that. The Fuel Base map is perfect, the car works well, runs well, running through the streets, the car is great. Get a solid feeling for where it is when the engine is warm and the idle speed is correct. Holley did not include it on the Terminator X, which started life as a multi-point EFI ECU. MAP Sensor. OK, I did the baseline idle speed screw setting.

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