I cant get the IAC to extend back out from its full retracted position more than about 3/10 of an inch. It needs to extend out 5/8 in. to be seated after warm up. If I enter a small start value and a larger cranking position count and then start turning MS on and off the IAC valve will move further out(extend) each time I cycle the power. By doing this Im able to get the valve all the why out and seated. I then enter a new start value of 260(retract) and a cranking position of 200. I cycle MS off and on, the valve retract all the way back and will still not come back out to the cranking pos. that was selected. The valve comes back out 3/10 of an in. and will not extend more than this regarless of the cranking count I enter. Any Ideas on a solution guys?
Running MS-2 , Rev 2.888 ,4 wire Chry. IAC , 2331cc V-Dub, IAC set at both moving only and also tried always on. Min steps 5. using Tuner S.
Ps, Im driving the car and it runs great (IAC unpluged) Thanks for looking. Noel
Another IAC head scratcher!
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Re: Another IAC head scratcher! (: Solution found
A light turned on in my head in the middle of the night. I looked at my IAC warm up table and discovered that the full warm-up count (IAC seated)was set to a count value less than the Cranking count in Idle Control. So, be advised , set up the IAC warm-up table first with a large count spread , say 50 (cold) to 300 (full warm-up) befor you start trying to figure out what counts you need to fully close and open your IAC valve. I was under the impression that when you turn the key on befor cranking the only thing that effected the IAC position was "Idle control, Start count and Cranking posion. Apparently software will not let Idle control exceed warm-up parameters. I think ? Im good to go with my IAC warm up control, so Now its time to start playing with X-Tau!
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Robert Spencer
- MegaSquirt Newbie
- Posts: 27
- Joined: Fri Oct 19, 2007 6:42 pm
- Location: Washington ST.
Re: Another IAC head scratcher!
Hello friend!
I was begining to think I was the only one with a vw and a chrysler TB. I am having the same basic issues that you mention. I will look at your sugestions tomorow. How did you wind up wiring the IAC to the relay board? I have tried every combination possible? Mine either extends on power up or retracts all the way and basicly stays there. I too have tried start #s from 160 to 300 and see no change. The IAC steps vs temp screen shows it moving but the pintle never moves. I have MS2, v3, 2.886, 2276, 52mm tb, 20lb Bosch Inj, EDIS, all in a Ghia.
Thanks Bob
I was begining to think I was the only one with a vw and a chrysler TB. I am having the same basic issues that you mention. I will look at your sugestions tomorow. How did you wind up wiring the IAC to the relay board? I have tried every combination possible? Mine either extends on power up or retracts all the way and basicly stays there. I too have tried start #s from 160 to 300 and see no change. The IAC steps vs temp screen shows it moving but the pintle never moves. I have MS2, v3, 2.886, 2276, 52mm tb, 20lb Bosch Inj, EDIS, all in a Ghia.
Thanks Bob
Ghias Rule