Incorrect connections will result in excessive resistance. Ok, so there are a couple peculiar things going on here. WIthout knowing quite a bit more it will be more than challenging for you to identify the problem and solve it.Fortunately, Holley provides their amazing Sniper Software. What I would recommend is getting somewhere that you can spend a significant amount of time doing starts. 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. Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. And so glad you guys are enjoying the Sniper EFI system. I cut and heat-shrink wrapped the 5V wire and then ran both the signal and ground wires all the way back to the transmission controller. I will be at a red light trying to brake against the engine. Running new vintage air system so the is only a single power wire to compressor thats why I asked if I needed to run input wire to ac relay or if iac would pick it up fast enough(which its not). Holley Sniper IAC Problem 04-26-2018, 11:30 AM Hello. I very pleased with the performance, it is a huge improvement from the 800CFM carb I had on this motor. In the wizard I set my Idle to 500RPM but it never got slower than 800RPM, if I run the wizard again and lower to 400 RPM then it never gets lower than 700RPM.After reading about the Idle Speed curver I checked its settings and found that the curve was 300rpm faster at every point over the temp range no matter what temp I had, I adjusted the curve to match what I put in on the wizard and now the RPM is correct, I'd say you have a bug in the wizard.Idle Speed > Idle Speed Curve: Here is where the lack of coolant temperature is going to affect you. To figure this out it's going to be important to gather a bit more data. The only way to confirm RFI problems is by doing a data log. 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. shut truck off. In the setup, I set the hot idle for 850. My Sniper is 99% great! Remove the tape from the IAC breather hole and restart the engine. You should get a light spray evenly distributed in all four barrels. NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! Using the handheld, navigate to Tuning > Basic > Basic Idle and ensure your target idle speed is set to the RPM you desire. But if I take off from a stop and go to 1/4 or 1/2 throttle its fine and takes off like a banshee. This will let you know at a glance if something is going awry with the fuel pump. If idle drops below 800 it wont come back itll chug around 300 rpm for a few seconds then die. Going back to what you said. Cheers Darren. It could be that the air flow across the secondaries as they are opening is creating that whistle but that isn't commonly the case.Did you check for leaks around the gasket of the air cleaner? I have it set at 650 and it idles anywhere from 590 to 700. The tps has slotted holes, can you adjust it to get to zero? I also raised idle at Park a bit with the idle screw. 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. 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 warm state IAC adjusted to a position of 2 to 10%. You can re-enable this after you have completed this idle speed adjustment process. What an amazing site you have here. He thought that something was wrong because when he set the idle 50 RPM below his target the resulting IAC postion was far too big. Genuine Walbro fuel pumps are virtually bullet-proof. 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 Thanks again. 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. Target AFR at idle is 13.8%. The Sniper EFI remote IAC (Idle Air Control) and plug is designed to gain installation clearance on some Sniper EFI 2x4 installations. They are prone to be inaccurate. We have shipped quite a few of these to customers in Australia and New Zealand so I know that there is becoming a good following there!We recommend this Inline 10-micron fuel filter to prevent problems like that. Now it registers zero and I have good idle but it will not register until it hits 60 and up. You have to remove all hoses in order to debug the problem. Due to when the pump i'm using now makes a loud howling noise when it gets ran for awhile and it gets at a 1/4 tank of fuel or less. Cl. Is there any chance that your timing has changed since you installed your Sniper? I have checked the pink wire and it is at .001 volts when key is off. 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. If the solutions suggested above are not working then you need to review my article on IAC Testing Procedures. Hi Chris thanks in advance for any tips. Give it a watch: https://youtu.be/7SO7-tZn6iw. Throttle Tip-In tuning can be a bit of a challenge but I'm confident you can get this resolved, Mike.Let me start by saying that unless you've really done a lot of driving on the system in some useful learning situations then I would set this issue aside and not even think about it. But I still get the iac at 0 and the rpm at 1200. Yes, having an accurate TPS is very important at idle. 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. If you find that adding 5-10 degrees of advance helps then it's time to do reconfirm TDC. The manifold pressure increases with the throttle opening but the RPMs are still low. When I start the motor I have to push on the accelerator pedal for the motor to start. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. Let's start by not assuming anything. I know this is old, but I bought and installed a Sniper kit in 9/18. Then a little faster--until bogs at that level work themselves out. 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. installing and cruising down the highway 70 mph I just wonder if all I have to do If so remove it. I recently install a sniper efi. Be aware that there is a spring behind there and a diaphragm that you don't want to tear. Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. I am having an issue with the IAC on the Sniper. Any ideas here? I've been trying to correct that 1% small issue/annoyance. Shut off car/restart and it's back to idle at Second, Holley just released over the weekend a video on how to implement a flex fuel sensor on their HP and Dominator ECU's. What could be the cause? Installed sniper on 65 galaxie. Thanks Again for your help. I recommend confirming there is no throttle linkage issue first. your IAC is at zero. nothing stays steady. There is a chance that the IAC is open but displaying 0% so start by putting your finger over the IAC opening. Thanks for the great question! If you remove the air cleaner entirely and the whistle continues then you can rule that out. If I try and get the 2-10% i get all the way up to 1200 rpm. idle counts from 0. I have never seen issue when CTS is below 120 degrees. Your issues are likely related to one of these two things. 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. Duty Cycle% = 3 The TPS will go red with a -15 and the AFR reads heating for a split second, then the idle kicks up to 2000RPM. 680-700.I can't find any reason other than it looses where it is in the firmware with There are a few tell-tale signs that can help you diagnose the problem. In that case, and if you have an EGR valve, I might be suspicious of something going on there. Once it decides to come back down, it does so with no issue. :-). This minimizes installation time and packages really well on a diverse group of engine applications. Bolt-on carburetor style EFI for your classic car or truck. It does this with the engine off. I did notice that when I thought I had it set I'm happy to walk you through what is required. However I do have a couple of issues I hope you can help me resolve. You can manually set it 57 after you run the Wizard if required. After 50 on the throttle position I'm not sure if the whistle goes away or you just can't here it anymore. Bottom line ismy first one must have been faulty. The symptoms I had was a low cold start idle and going lean coming to a stop. My sniper is doing two thingsFirst issue, the idle is set at 800 and will idle fine, then There is a glitch in the system. I installed a Holley Sniper on my Ford Maverick 302 V8. The problem was RF interferance . Thanks for any help. This curve runs fom -40 degrees to 260 degrees, and gradually reduces the RPM along that range. I will let you know what the results are. Idle Tuning is a very important part of tuning any EFI system, especially our self-learning units like Sniper or Terminator X EFI. I would disregard any correlation between idle control between the Stock and Street/Strip setups. Yes, it will talk to you--but not with words. This will tell us if the ECU thinks that it is in control of setting the idle or if it thinks that you are driving the engine speed with the pedal. In this short video you learn to replace the IAC. Sniper EFI offers superior throttle response and wide-open throttle power. This may require shortening or lengthening a rod. Has a good size camshaft cant find any vacuum leaks. I think I figured some of my problems outI'll try to explain. If the IAC is zero, and if putting your finger over the IAC port doesn't lower it, then it's not the IAC circuit. A couple of possibilities that come to mind in order of likelihood: Im having an issue with what I think is the Iac. 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. Thanks for the information you have provided on this site. Hot start it most of the time wont start unless I give it a little throttle. Give that a go and see if you don't make some progress! I also noted that after some time, I could change those values as I saw fit. It will still change a bit with weather changes and when you get into infrequently-used sections of the map, but it's nothing to worry about.Regarding your idle speed immediately after start-up, that is determined by your Idle Parked Position. All EFI systems need a large fuel filter to trap dirt and yet not reduce volume. 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. If your fuel pressure is at or about 60 PSI then visually inspect the barrels of the throttle body while having someone key on the Sniper. knowledge with the sniper efi setup. Capability Range: Advanced The person I bought it from said he never could get it to run for more than a few seconds. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. Cycle the ignition as instructed by the handheld and then navigate to the distributor setup screen. This car has never idled under 900 without stalling with 3 carbs and does the same thing with sniper edit. That is not the way to go. I used the Casper's Electronics 108103 splitter and carefully soldered my connections. MAP Sensor. One of the great features of Holley's Sniper is the ability to set your air/fuel ratio (AFR) where you want it. When I first told him to check for leaks he looked back there and said "all good". Without it you are working in the dark. I'll have to check again tomorrow. However, I always preach to never touch any of the controls on the handheld until you have a couple hundred miles on the engine in a range of driving situations. 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. Coming home from work today it was much warmer and took a little longer due to traffic. It's called tuning. I installed another return spring for the rear plates problem solved instantly. Save Share. It could be a problem with the power/ground for the Sniper but much more commonly this is a result of too much RFI. For the first couple of drives it was running well, Sniper EFI was working exactly as advertised. Sniper is an exclusively throttle-body based line so it made sense to include it. If I put the truck in park it comes down to idle. For someone in your position, it will become an indispensable tool in your tool box. These are "transitional" cells, and you really have to make the effort to learn in these areas of the map. The engine runs beautifully, with perfect idle at 650 RPM, but every now and then I hear the IAC give a sort of "snap" and the idle is at 1200 RPM. I would start by datalogging the situation and seeing exactly what your learn table looks like in the area immediately around the tip-in. Tried that and it didn't work? Overview. I ask because I'm using a PCV valve with my Sniper and have random idle issues as well. To do this, open up the Initial Startup gauge screen that was used in section 17.0. Holley documentation and videos didn't work and the $300 I paid for "expert" tuning didn't work either. If you don't have a working coolant temperature sensor then it will never bring the idle speed down. Even at 0% it's sucking a bunch of air through the IAC port. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. When this occurs, I sometimes can shut it down and it will return to the correct settiings. Im not sure what its doing, have messed with after start fuel, fuel at cranking. I have quadruple checked my wiring and am certain it's correct. Drop the IAC parked position a bit at each temperature point and sort of back into the solution. I.e. You want to ensure that nothing is hung up in there.The only thing that I can think of that would cause the fuel pressure to spike when the motor starts is the increased fuel flow at the higher alternator voltage (jumping from 12.0 to 13.5 volts or so.) first attempt but as it tries to idle down to the target RPMsit can never even Laptop Access 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. 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. If the engine idles at 750 RPM with the throttle plates all the way closed and the IAC at zero then there is some sort of an issue. No air should be able to pass. The tps will not auto reset to zero. The first place my eyes go when there is any issue with the idle is to the TPS value. When the idle speed screw is turned all the way out there should be just enough room between the bore and the blade to catch your fingernail. When I cover it with my hands, it gets quieter. Hello. This page was generated at 12:25 AM. Covered the IAC port and set idle for 850 ish. Next, clean the IAC and all related parts with brake cleaner. I have seen this become blocked with debris / dirt in the fuel system and cause a high fuel pressure condition . Do I have to hook up sniper ac wire to relay or should iac pick up idle?
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