86TpiTransAm

I think the topic basically says what I want to know. I have suspicions that my IAC is wore out and that I'm possibly maxing it out but generally that I'm not getting the proper IAC counts. I have a scan tool to check it, I just need to know the approx range that I should be in. When fully warmed up, the engine idles at 700rpms in drive and just over 1,000 rpms in park.

kevinc

At operating temp you should see ~20-30 IAC counts.

Much lower than that and you want to take turns out of the min air screw, which will cause the IAC to open more, showing a higher IAC count value.

Much higher than that and you want to turn the min air screw inward, which will cause the IAC to close more, showing a lower IAC count value.

86TpiTransAm

Wow, thanks for such a detailed answer. That's exactly what I needed to know. Much appreciated.

One quick question though, is that 20 - 30 in park or drive? or does it matter?

87_TA

in drive.

kevinc

Actually, I adjust min air to get 20 counts IAC in park at operating temp.

87_TA

oh i was told by tpis to do it in drive ,but im sure alot of you know they are not always a great source of info.

86TpiTransAm

Well I'll just try it both ways and see which one works best for me and go with it