Ran 2 Holley carbs and an Edelbrock. It may take a few tries. Ive played with the timing on this thing multiple times.Car was fullly restored last year. Im thinking a faulty TPS. It's going to be really difficult to nail down the problem with the several simultaneous changes that you've made. that my Air/Fuel ration was 15:1 and I believe the target is 13.5:1. What could be the cause? We're never going to fill up your email box with nonsense. May God's grace bless you in the Lord Jesus Christ. Give that a go and see if you don't make some progress! Fortunately, Holley has another product that can solve that: Hydramat.. Hydramat is not inexpensive but you won't believe what it can do. 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. First thing I would check I have adjusted many settings and eventually mess it up and go back to the original map. It could be, but that seems unlikely.Instead, you need to look at the basics. Then it will ramp down to 1200 but will not return to idle. (Plus they it just looks way cool in your engine compartment!) Since the shield was put on, not a single problem, not one. You are aware of the idle-up problem. Check fuel pressure too (. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. and when I close the IAC's hole with his finger, the engine is normal.The data on the touch screen I see are:AFR, A / F = 35.6 Then your low idle problem will go away. When I cover it with my hands, it gets quieter. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. Be sure to re-enable it once you get your idle tuned. Second, Holley just released over the weekend a video on how to implement a flex fuel sensor on their HP and Dominator ECU's. This software is going to allow you to open both the configuration file and the datalogs that you create, overlay them and you can get a much better idea of what is happening. Bolt-on carburetor style EFI for your classic car or truck. From herethe cycle continues and I am For someone in your position, it will become an indispensable tool in your tool box. Others might require 60 RPM. That initial rev is going to be determined by your IAC Park Position. Chris thank you for the info. me know how it works for you. would correct it (as it has for a multitude of other drive-ability issues) but this one little glitch seems out of it's range. We have never had that problem with any of the units that we have shipped. By the way your site and your accessory products are nice. Sniper EFI Tuning & Tech. After speaking with Holley Tech Support and Tech Support from where I purchased the systemthey decided to replace it. 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? It sounds like you need a bit more of a fuel squirt on acceleration, Brett. But I think it is safe to say that you are now at a point were some manual tuning is a good idea. So what--you're never going to drive in minus 40 degrees, right? If it is already adding fuel, it may be worth expanding this into the area where the tip-in is occuring (and where there is no learning occuring. First--besides the fact that it's not represented on the display, it is not even a parameter that you can datalog. 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. And the rather cavalier "Absolutely!" Short drives is fine then it'll I can have it working fine (5% to 10% at target idle at operating temp.) Does this seem reasonable and how hard will it be to get the idle and off-idle performance correct? When I covered the IAC with my finger, the RPM dropped so low it stalled. I keep doing that with the same result. Target AFR at idle is 13.8%. In your case, however, I think you're close to getting it running. Should i adjust idle screw with the fans already on? 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. Hopefully replacing the pump again will resolve both issues. 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. 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. On startup- cold or hot, I get a 2 second high idle of about 1500 RPM before normal set idle of 750 RPM happens. The engine makes very low vacuum at idle. The answer will divide the possible sources of additional air into two, greatly simplifying the problem.If the IAC number has not increased, then review the article above regarding high idle from a vacuum leak or high idle from sticking linkage. 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). I have certainly seen this before on other fuel injected vehicles when hot. In this short video you learn to replace the IAC. I would recommend that you call first thing in the morning, as they tend to get quite busy during the day and wait times can get long. shut truck off. The progressive link can be a great solution on standard (non-Stealth) throttle bodies but I would install this LAST after everything else is working perfectly. Installed sniper on 65 galaxie. i'm having is I can't seem to get the truck to run faster than 45 mph at speeds 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. You may have to register before you can post: click the register link above to proceed. Do I have to hook up sniper ac wire to relay or should iac pick up idle? The Sniper Quick-Start Manual provides the following instructions for setting the idle. It is how the engineers allow you to clear a flood condition when you detect it. Inj. Yes, it will talk to you--but not with words. Turned it off and on again. Clearly, something is changing. 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. Rpm with 4-8 iac but it still shows red and shuts off randomly at idle and it won't even drive 2 miles without shutting off. You can re-enable this after you have completed this idle speed adjustment process. ps. 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). Any suggestions? Thank you very much. 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. Engine warms up to 195 degrees and stays. My guess is a faulty IAC since it is intermittent and I have not done any setup changes. I installed a sniper efi system on my 1969 Camaro. There are a few tell-tale signs that can help you diagnose the problem. First, recognize that the amount below your target where you set the hard idle will be different on different engines. However, I can't think of a single one that was because of low vacuum. Jun 12, 2021. If you see that the ECU is commanding the IAC to 0 but there is air entering the IAC port then it's time to refer to my article on IAC Testing Procedures, Hello,I installed my sniper system on a 65 mustang, with a 302. 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. Thanks again Chris, your help has been invaluable.If anyone is considering going EFI, Chris is the man to chat with. The "PC Text" indicates what will be shown on the PC/Laptop data monitor or data logger. the issue https://www.youtube.com/watch?v=2JpHlS1ymBc, If this is your first visit, be sure to I believe because the TPS is not registering. 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. If so remove it. This minimizes installation time and packages really well on a diverse group of engine applications. Now it registers zero and I have good idle but it will not register until it hits 60 and up. Your closed loop compensation is adding a full 50% fuel. They also worked with me on a sale I missed and price matched those parts. If the TPS is 1% or below then the ECU is in control--2% or greater and the ECU thinks you've got it under control. To do this, open up the Initial Startup gauge screen that was used in section 17.0. Any help would b great. sniper Installation If you're installing a Sniper EFI system and almost ready to crank it over for the first time, this is the video for you! I would disregard any correlation between idle control between the Stock and Street/Strip setups. But if you will just advance the timing at idle and see if it makes a difference then that will tell you what you need to know. I figured out I was going the wrong direction when I was messing with the AFR programming. Or alternator? I think that this time around you will find that it starts and idles really well and only gets better from there. The engine might run hot but if the timing is right it should keep that heat in the engine--which is where the damage turns up. Once you have done this the challenge is to create a datalog that includes the ":snap" you describe. These are "transitional" cells, and you really have to make the effort to learn in these areas of the map. Should the iac% fluctuate? One of them might be faulty. Holley will take a look and tell you you have RFI and wish you good luck in finding it. An undersized or partially plugged fuel filter is a classic EFI installation mistake. I, too, wish you'd bought your Sniper from us! I would start by removing the progressive linkage. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. 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. If I adjust idle screw out to get the tps to zero or even 1% the engine will not idle.
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