When you key on, you will hear three distinct sounds: The ECU initializing the IAC, the fuel pump priming, and the injectors firing their prime shot. Comp. This value is itself enough to raise the idle a bit. Is that normal? I have probably 200 - 300 miles on this engine and it has always done this. Hopefully replacing the pump again will resolve both issues. With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . As you see above, the Sniper is going to dump in a maximum amount of fuel at zero TPS, begins to remove acceleration enrichment at 60 percent TPS, and then removes all acceleration enrichment correction at 100% TPS. 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 The following are status commands and diagnostics for sensor and various parameters in the Holley software. Not good.There isn't set solution here that works for all engines. There's nothing wrong with manual tuning, but at this point that is just compensating for an inadequate fuel map. Idle quality is great, RPM is good, sometimes IAC is now between 2 and 5 exactly where it should be. close to idle with the IAC between 2% & 12%. By the way your site and your accessory products are nice. The fuel pump is mounted under rocker panel as low as possible and far away from any heat. other things that might cause the idle to faulter, but this is a good start. Switch power to the Sniper on and crank the engine. 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. We will definitely be sticking with Holley from here on out for future retro-fits. 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. I'm new to the efi thing and any help would be seriously appreciated. It didnt do this with the carb on it. The jack-rabbit start can usually be minimized by adjusting the throttle linkage. Sometimes an engine can produce enough vacuum to pull the secondaries open slightly. Sniper EFI Initial Startup and Troubleshooting - Holley Take it a step at a time. For someone in your position, it will become an indispensable tool in your tool box. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. Your issues are likely related to one of these two things. So this is my issue ( I did just email Holly). 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. Everything was working perfectly and I shut off the engine. However, I have never found that to be the case. Full product line and accessories at excellent pricing. With the vehicle in neutral, adjust the idle screw until the IAC Position reads between 2 and 10%. The second thing to realize is that even after you get it just right, you need to keep an eye on the IAC number and reset the idle if it gets outside the 2-8% range when idling when warm. We offer some tips to help with that. However, I have what I will call a whistle at a throttle position on 35 - 50. If you feel you have no other choice but to run a Sniper and stand-alone controller then you can give this a try. That 60% (which is configurable) is known as the Clear Flood TPS. He is able to get it to start by quickly depressing the accelerator to at least 60% and releasing. It is a common one. I will let you know what the results are. Idles ok, runs great cruising, but from a stand still or downshifting and making a turn, when I get back into it, it wants to fall on its face. 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. 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. Simply turn the idle speed screw on the linkage in until the throttle plates open enough for the idle to increase. technical rep said "You ahve high fuel pressure". I have a set of 8.8 Accel Rfi suppression wires on it. Price Point: $, Advanced throttle body injection systems capable of transmission control and more. In addition to avoiding this particular problem, the total solution is much better. The tps has slotted holes, can you adjust it to get to zero? I've been trying to correct that 1% small issue/annoyance. 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. When you open your IAC to 30% you are naturally going to have a high idle condition. The whole topic of using the Sniper TPS for transmission control is one deserving of it's own article but I'll try to summarize a bit here. Now that you've installed at least four Snipers it is going to be imperative that you learn to create and read datalogs. My issue is that when Im in stop and go traffic, I can let off the clutch and the engine revs and doesnt quite want to come back to idle. But before you adjust the ECU to lean the idle out, first confirm that your fuel pressure is right. engine works beautiful, the car runs a lot, but suddenly, the engine does that. 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. Since your target is probably more like 700, and since 2400 is way over 1700 RPM, it's going to leave the IAC in the park position.Buckle down and find how air is getting into your engine. knowledge with the sniper efi setup. These aren't generic newsletters either but instead personalized emails. The idle will not return to the set value.The second issue is the same as the first but the motor will stall out. The on board fuel pressure regulator in the Sniper throttle body has a small filter clipped over one end . Once you know that then you can work on those problems. Im thinking a faulty TPS. Next, reach down into the secondaries and push the butterflies closed. Some have suggested the gasket might cause it but I've never heard of anyone fixing the whistle by adjusting the gasket (and many have tried. (Plus they it just looks way cool in your engine compartment!) If the engine will after the 4 seconds that the IAC kick drops off then it's not really going to help.At any rate, it costs you nothing to advance the ignition and see if that doesn't improve the idle, right? Holley - 543-105 EFI Idle Air Control Motor , Black - amazon.com It wont fire up. Please advise. Thanks for the information you have provided on this site. It could be that you've left a vacuum port unplugged, it could be that the throttle plates are misaligned (unlikely), it could be that your IAC is not closing properly. Inj. The only way to confirm RFI problems is by doing a data log. I haven't driven it for the 30-40 minutes like the several times it idled at 2200. And yes, monitoring the fuel pressure is the right answer. That, on top of your air leak, is allowing the engine to idle at 2400 RPM. I am at the point where I almost insist that every Sniper EFI System owner purchase one of these. I'll have to check again tomorrow. Start engine let it warm up to 160, learn mode is learning. nothing stays steady. Ran 2 Holley carbs and an Edelbrock. As I said above, you could have a bad IAC, but then again, the IAC might be fine and there's a deeper problem such as RFI noise causing the issue or a vacuum leak that is confusing things. I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. My problem is low idle. Ok, so there are a couple peculiar things going on here. You may have to register before you can post: click the register link above to proceed. 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. Even at 0% it's sucking a bunch of air through the IAC port. 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. They also recommended that their ground be spliced into the Sniper ground as close to the Sniper as possible. Copyright 2017 Cyberspace Automotive Performance, Inc. All Rights Reserved. The first 250-300 miles were amazing as the Sniper EFI worked flawlessly. This increased idle speed is triggered by grounding the orange wire in the 10-pin I/O harness. Wish I had bought my sniper from you, but unfortunately didnt. I also noted that after some time, I could change those values as I saw fit. Keep in mind that at 60 miles the I will try the other stuff when I get off work. When I turn it off and try to restart it just cranks. However based on your reply I connected the Fuel Pressure gauge and Capability Range: Advanced Take a drive and stop somewhere for 30 minutes, CTS is 170 when engine was shutoff. I thought 12.0 was leaner at idle, but I figured out I was wrong.lol. It runs perfectly fine other wise. If this is the case then I would look particularly close at the IAC hold position and IAC ramp start.Let us know what you find and what works for you! Sorry for all the questions, new to the efi world. Now I have most of the bugs worked out it runs fine on the highway and around town it's just the idle. Mechanical Fuel Pressure Gauge on the inlet of your Sniper, now is the time. 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 I asked him a million questions and waited a long time to save up before purchasing the system and I have asked a lot of questions throughout the installation process. It sounds to me like it is way retarded.In the event that the timing is right then take a look at your AFR--the actual AFR, not the target. That is not the way to go. The tps will not auto reset to zero. It's hard to know what the previous owner did right versus wrong. I am new to the EFI scene but want to learn. 34K views 1 year ago Holley Sniper How to Set The IAC Idle air Control in 5 minutes or less. Closed Loop Compensation rises to 100%, Do I just keep pushing it the same way to I had HIGH Idle issue and fixing this curve FIXED the ISSUE --- THANK YOUCan you explain what "Current Learn % means, after finally fixing the idle problem this % jump from -1 to -30% in about 5 minutes at idle with CTS @ about 170.Also when starting the car at hot the engine goes to about 2300+ RPM for a few seconds then crashes down to my Hot idle speed of 950 -- bounces a little and then smooths out. What must remain foremost in your mind is that the only thing that can cause the idle to increase is additional air getting into the engine. Both Sniper and trans controller grounds were direct to the battery ground, as they should be. After doing TPS reset it starts fine but when you give it some gas it hangs at 1500 and will not return to idle. Should I just disable idle timing control? If you set the RPM above idle to start ramp too high, then it may not ever get down to the RPM above idle to re-enable. I think that this time around you will find that it starts and idles really well and only gets better from there. 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). I tried adjusting my IAC up to 10deg in both directions with no change. Solving Holley Sniper High Idle Issues - EFISystemPro.com Thanks. 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. If not then you have some other issue that is behind this increased idle. Sniper EFI offers superior throttle response and wide-open throttle power.
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