It has a lightweight centrifugal spring kit installed so I reach total timing around 2500 rpm. This is very disappointing as people love to hear the motor while the hood is open.Thanks Jon. An under-sized filter will allow part- throttle operation but fuel pressure will drop at WOT and run very lean - perhaps surge under power. Also if I give it a Note: The IAC breather hole is the roughly 1/4-inch triangular hole that sits above and between the secondaries. Ensure all your sensors are displaying proper values. I installed a Holley Sniper on my Ford Maverick 302 V8. If you complete the process and find that the IAC is less than 2% at idle, repeat the process and use the set screw to make the RPM about 60 RPM below the target. Inj. When I put it in gear, it drops so low that it will stall if I don't add throttle. Installed sniper on 65 galaxie. Comp. I, too, wish you'd bought your Sniper from us! 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 Thanks for the great question! Hello 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. But get that fuel system fixed before going any further. If you get into the practice of hearing all three of these sounds you will know if you have a problem even before you turn the key to crank. I was looking at a data log from my truck earlier this week and noted that at idle my IAC was zero. Can the return line be an issue?I have had 2 faulty gpa-4 255 walbro pumps go bad. It then started working normally again. During cruising at 30 miles and release the gas pedal the engine revs at aproximaly 1500 RPM and it won't drop. Or is there something else I should It's not that they (or any other manufacturer) is 100% perfect. If I read it correctly, the solution from the other thread seemed to fix a constant 300 or so RPM increase. https://www.youtube.com/watch?v=2JpHlS1ymBc, If this is your first visit, be sure to It's hard to know what the previous owner did right versus wrong. In the context of the Sniper the AFR that is being displayed is the AFR of ethanol-free gasoline based on the lambda that is being read by the AFR. to. NOTE: Do not attempt to set the target idle speed and IAC position until the engine is above 160F! Then why don't you Get On The List for Emails Straight From Our Pro? I watched the butterflies start to open at about 35 on TPS. If I keep the rpm's up it does fine but my clutch can't keep up with this for long.Also when I cover the IAC port the engine dies. To keep it running in gear, I have to bump the neutral idle up just over 1000 RPM. Ran 2 Holley carbs and an Edelbrock. Any suggestions would be appreciated. Fought a high idle issue until I changed your idle speed curve fix along with dropping the IAC hold to 10%. If you have any questions about the car/setup let me know. When I put it in gear, it drops so low that it will stall if I don't add throttle. Again, I would lean on that solution to let the vehicle drive/learn before you try to "fix" anything. In the setup, I set the hot idle for 850. And the rather cavalier "Absolutely!" 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. Thanks for sharing that, Jason--great info! I will try the other stuff when I get off work. Ive played with the timing on this thing multiple times.Car was fullly restored last year. I'm wonder if the iac can cause this. 2. Intermittent stalling usually points to radio frequency or electro-magnetic intereference (RFI/EMI). Reply Quote. The IAC reads 36 when at idle fully warmed up. That is not something I'd ignore. Ok, so I'm stumped! But I still get the iac at 0 and the rpm at 1200. If I adjust idle screw out to get the tps to zero or even 1% the engine will not idle. 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! But I am having troubles.When stepping on the accelerator slightly with idling, it will be 2000 RPM all the time. Resistance results in heat and heat results in more resistance. Plus, you can email that file to me and I can be of more help. There's still a very small amount of airflow that squeezes past a closed IAC valve; it's that venturi like sound you're hearing. I am new to the EFI scene but want to learn. Idle IAC problems? - Holley Performance Products Forums Any idea's? Thanks again. That is the default "Clear Flood" TPS setting and turns all fuel off until the engine cranks. There's a procedure there I can share with you if you'd like.. Bottom line ismy first one must have been faulty. I followed the instructions and set the IAC to 2-9% when warm with idle at 850 RPM. When you set the Static Timing to 15, what did you read with the timing light? Hi Chris , greetings from Down Under (AUS) Just a note on the hi fuel pressure issue . The timing can drift 0-30 degrees just due to the width of the rotor tip. All times are GMT-6. first attempt but as it tries to idle down to the target RPMsit can never even Also its extremely rich at idle. You'll have to go back and forth a couple of times to get it just right. About two minutes after I get it set at 850 & 5%, it has progressed to 100%. And, hopefully, within those degrees you will find a place where you don't get the whistle. I am right back to where I started. 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). 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. Generally, one of two things: a stuck throttle or noise on the TPS signal. After the start process, If the idle speed is higher than the target idle then the IAC should begin closing as long as the TPS is below 2%. :-). Shut it off and immediately restarted and idle was now 880 with IAC at 8.If this is a vacuum leak I can't figure out what would cause it to go away immediately after shutting down the car and restarting. Those little 1/8 NPT gauges are pretty inexpensive and generally pretty easy to find locally.If you confirm that the pressure is indeed 90 PSI you could pull the fuel pressure regulator apart and check it. I was 20 minutes into a drive yesterday when all of the sudden the RPM increased not commanded. Always had to set idle above 950. I have adjusted many settings and eventually mess it up and go back to the original map. 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 window you saw in the image above pops up. I' m going to put the 3 rd new pump this coming friday. An undersized or partially plugged fuel filter is a classic EFI installation mistake. Please check your process again and see if you can see very specifically what is not working correctly. Using the handheld, navigate to Tuning > Basic > Basic Idle and ensure your target idle speed is set to the RPM you desire. I can drive it a bit but pops through the throttle body when pulling out from a stop (4 speed) and sometimes in the exhaust out on the road. Could the IAC be broken/malfunctioning? I will a, Scott has been very helpful and informative on guiding me through the purchasing and installation of my terminator X max system. We offer some tips to help with that. Setup: 1965 Impala SS; ZZ6 Crate Engine, EFI Distributor. I have turned ignition off turned screw in 2 turns and turned ignition back on and tps is at 1-2% not sure whats going on. Tuning Your Sniper EFI System for Progressive Secondary Link Use We're never going to fill up your email box with nonsense. IAC Testing Procedure for EFI Systems Free ground shipping regardless of order size! Stupid question, but where do I see if it's entering Learn mode? After doing TPS reset it starts fine but when you give it some gas it hangs at 1500 and will not return to idle. When I shut it off then start it This is extremely unreliable afrer warm. Did your process to adjust idle to 860. 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. Save Share. Start engine let it warm up to 160, learn mode is learning. Should the iac% fluctuate? When I covered the IAC with my finger, the RPM dropped so low it stalled. mail today. At low levels RF interference will often reset the ECU so quickly that the engine will not stall. It will need to see it again and again. It only comes back to normal if I turn the engine off and on again. That is a good thing.I don't have a specific target RPM but always encourage automatic transmission users to bias the idle just a tiny bit higher than what you might otherwise. I did notice that when I thought I had it set engine works beautiful, the car runs a lot, but suddenly, the engine does that. Took it for a lap around the block and came back. installing and cruising down the highway 70 mph I just wonder if all I have to do But there are several degrees of play there in which it should still work fine. It is working fine when you restart the car, controlling idle perfectly at 8 steps open so it is unlikely to fail when the car warms up--or correct itself instantly when you restart it..So, if you don't have any vacuum leak, and the throttle plates are fully closed, the only thing I can guess is something is causing your ignition timing to change. Simply turn the idle speed screw on the linkage in until the throttle plates open enough for the idle to increase. Tps is saying 26% when it at idle. Thank you for this guide on setting IAC. Realize that when you drop the throttle, the engine enters a condition it will only see for a fraction of a second at a time. My guess is a faulty IAC since it is intermittent and I have not done any setup changes. I'd recommend you contact Holley Tech support to get their input (1-866-464-6553; call early for the shortest wait times.) 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. They tell you to ask call Holley. Idle > IAC Kick. No power at the programmer and no fuel pump running. Wish I knew about it before I made my purchase. Now I have most of the bugs worked out it runs fine on the highway and around town it's just the idle.

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