Yes, having an accurate TPS is very important at idle. 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. What would cause the idle to faulter like that? We're having trouble with a Ford Maverick 302 V8, using ethanol. I installed the Holley Sniper in my Chevelle this winter with a brand new BluePrint 496. It's the same one that Holley puts in their Sniper Master Kits and I've never heard anyone with anything but good things to say about it. Next, clean the IAC and all related parts with brake cleaner. This will go a long way to improving your fuel map without manually adjusting the acceleration enrichment. Hi Chris thanks in advance for any tips. port that goes right on the inlet of your Sniper and makes installation a breeze.If your fuel pressure is solid at about 60 PSI then you should start looking at On a cold start it will idle at 750 everytime, But if its hot start it will jump upto 1600rpm for 2 seconds then come back to 750. Not that I noticed. With select intake manifolds, the distributor housing and IAC valve on the back of the Sniper EFI throttle body are fighting for the same . such high fuel pressure. Once you know that then you can work on those problems. I think that your Sniper system is working fine but would definitely check ouf the fuel pump. I'm running a 408 sbc. Hi I wish I had bought from you but I didn't find this site until now. Give it a watch: https://youtu.be/7SO7-tZn6iw. If you patiently adjust this over the course of days you will get it just right.Again, glad this is working for you and look forward to a good report in the future! That is not something I'd ignore. You're going to have to clean up the wiring in your engine compartment, In particular, look for spark plug wires that might be running near your throttle position sensor. Even 50 RPM can make a difference in how much impact the transition to Drive has on the idling engine's ability to stay at a fixed RPM.I would not recommend it in this situation but anytime a "kick" in idle speed is desired that is easily done by setting the kick value in Tuning > Advanced > Adv. If you datalog the Sniper ECU and see multiple overlapping traces for the same signal, you likely have RF-induced problems. That is not a huge problem but it just means the IAC has no ability to lower the idle beyond what it is running at that point. I've helped folks work through a number of challenges with their Sniper EFI System installations. If you do find you have RFI issues then I've written an . Start with the most gradual throttle input you need to launch well, then slightly increase until you feel some stumble. Repeat until that stumble goes away, and then try a bit more throttle. Data logs show no EMI/RFI. Tuning > Advanced > Adv Idle > IAC Startup Once we recognize that, the next step is to narrow down all possible sources of additional air until we discover the cause.Start by keeping an eye on your IAC number. the issue Maybe Holley will add Fuel Prime Multiplier to Terminator X later. When I turn it off and try to restart it just cranks. This may require shortening or lengthening a rod. In the warm state IAC adjusted to a position of 2 to 10%. We have never had that problem with any of the units that we have shipped. Then it will ramp down to 1200 but will not return to idle. The Tech Tips and discussions are also great! It does this with the engine off. Fuel Prime Multiplier is primarily a benefit to throttle-body based EFI systems. carburetor setup, but it does blow when I can't jump on the highway like I use To be honest, you sound like an ideal candidate for Sniper ECU ignition timing control. Yes, it will talk to you--but not with words. 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! Simply go to those cells, tweak them up or down as required, and the ECU should now be able to learn its way around the bog. If you can send a data log to the vendor from who you bought your Sniper EFI System they should be willing and able to take a look and recognize RFI and then give you some ideas on solving it. When I finished the install on my C10, I set it as follows: 13.1 at idle, 14.2 at cruise, and 12.9 at WOT. I have heard some guys complain that the idle is too good and they can't hear their cam anymore I'm kind of like that. It appears that I could now use the dongle and a laptop to custom tune for idle issues if needed. So something is triggering the ECU to be in Open Loop. I think you will find that it will learn its way through this. But there are several degrees of play there in which it should still work fine. If you can track specific engine coolant temperatures where the engine stumbles and dies that would be a good place to start. Don't be surprised if one or the other is slightly open. Im thinking a faulty TPS. )Take a look at your AFR during the starting process. 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. I, too, wish you'd bought your Sniper from us! It runs perfectly fine other wise. Idle > IAC Kick. I'll give the ". Idle quality is great, RPM is good, sometimes IAC is jumping around from 35 to 60. I recommend confirming there is no throttle linkage issue first. But if you can datalog the bog you can know much more precisely what is happening. I have quadruple checked my wiring and am certain it's correct. The car cruises fine, and if I was to keep idle at 2000rpm the issue wont happen, its only when the car tries to ramp down to idle position.Thank you for your help, any advice would be appreciated.Thank you,Eric, Whenever we see the AFR go to "Heating" that is an indication that the ECU has been reset. I think that the more important point is that Holley kept sending him units until everything was working. IAC is good 0-5% most of the time. Thank you for this guide on setting IAC. It is easily solved by installing a four-hole gasket or four-hole spacer (depending on your hood clearance issues.) There is no sense proceeding until your TPS is at zero at key-on. 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). :-)Yes, learn impacts idle too, and remember the even when the basic learning is done there will continue to be some learning for changes in weather, altitude, etc.Go ahead and try a few idle settings and see how they impact the idle-speed searching. May God's grace bless you in the Lord Jesus Christ. The broad consensus has been that the Sniper is an amazingly straight-forward install and starts and tunes as expected. Every time though I can turn the car off and restart and it settles at 850 with IAC 2-4.The thing that has me puzzled is how the with the only difference in condition of the car being the restart, the idle is "fixed"Any clues on where to look next please let me know. You're going to have to get this fixed or it's going to cause even more problems than the high idle. Interesting situation you have. This item: Holley - 543-105 EFI Idle Air Control Motor , Black $71.72 Holley Sniper EFI 870001 Throttle Position Sensor $34.60 Holley 860004-1 92MM Sniper Throttle BDY $223.93 Customers who viewed this item also viewed Page 1 of 1 Start over Holley EFI Idle Air Control (Iac) Valve Motor 30 13 offers from $79.56 have noticed on the hand held is that Air/fuel Ratio rises to 20 +/- A/F and the It's pretty hard to get the header tubes glowing at idle with a lean AFR. The engine makes very low vacuum at idle. 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. Holley documentation and videos didn't work and the $300 I paid for "expert" tuning didn't work either. This is normally used as an A/C idle-up circuit. Please advise. The biggest issue is these problems are intermittent meaning they do not occur all the time. No timing control, coil negative ignition type. That's a nice change of pace--a low idle issue! A good example of why it's so important to run a good pre filter in the fuel line. 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. At some point you come upon problems that evade the easy answers and this is a good example. Advanced throttle body injection systems capable of transmission control and more. There are two ways to address this--you can let the system learn or you can manually adjust the acceleration enrichment. Let me be perfectly clear: If your engine will not drop below 1350 RPM with the idle speed screw turned all the way out then you have an air leak. (Do this while you are cranking.) Relatively new Sniper EFI install on a '69 Mustang 302. Then it changes and will not idle down, the handheld will display 0% IAC but you can see and feel that the IAC valve is more like 100%. 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. Earl's Mechanical Fuel Pressure GaugeI could use that for a quick troubleshooting for 1/3rd the cost of the Holley one. Both answers you've received greatly oversimplify the truth in favor of the answerer. We will definitely be sticking with Holley from here on out for future retro-fits. Not good.There isn't set solution here that works for all engines. The learn percentage should gradually decrease to virtually nothing as the map plus learn table begin to get more and more accurate to your specific setup. That's not the IAC Hold Position, it's a percentage value. Let's start by not assuming anything. At 0% it shouldn't be sucking any air through that port, correct? From herethe cycle continues and I am Chris---I am contemplating replacing my Holley 750 on my new low vacuum 600 HP 496 with the Holley Sniper FI system. Even at 0% it's sucking a bunch of air through the IAC port. One of the most common symptoms of a Holley Sniper EFI problem is an air/fuel mixture that's too rich or too lean. 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. Can the return line be an issue?So far this sounds like an ideal setup.>I have had 2 faulty gpa-4 255 walbro pumps go bad. I watched the butterflies start to open at about 35 on TPS. (Grease can sometimes do the same thing as a more permanent gasket sealer without making the removal of the air cleaner such a pain.). Seems like its too slow to grab idle when ac kicks on. 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. But after sitting static idling for a little bit, the IAC goes to 100% & stays there. 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. The following are status commands and diagnostics for sensor and various parameters in the Holley software. Without it you are working in the dark. I'd recommend you contact Holley Tech support to get their input (1-866-464-6553; call early for the shortest wait times.) If you go the other way then you might find that the IAC zero's out when the fans are off. I never had a problem with this. Jun 12, 2021. Reply Quote. Do please let us know what you find out! Hi Chris I didn't get any traction on Holley.com 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? 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. I have checked the pink wire and it is at .001 volts when key is off. The next time it happens is the perfect opportunity to find the problem. In your case, however, I think you're close to getting it running. If you have any questions about the car/setup let me know. If that happens then follow my 10-step process shown above. I installed the Sniper on my 1978 Ford F-100 with a small block Price Point: $$, Robust, feature-rich multi-port EFI systems offer easy plug-and-play late-model V8 engine swaps. It's called tuning. Then your low idle problem will go away. 90% of problems, (INCLUDING MYSELF) could be answered/fixed by just reading the instructions. Start by doing the fastest start you can that doesn't bog.
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