IAC diagnosis question?
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Joined: Apr 2009
Posts: 263
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From: IL
Car: 89 IROC-Z
Engine: L98 5.7 liter
Transmission: TH700r4
Axle/Gears: limited slip 3.23
IAC diagnosis question?
I have suspected that the IAC in my 89 IROC 5.7 is faulty, but my question is if the IAC is unplugged and you start the car should it idle normally and throw a code to the ECM. The reason I ask is because I had it unplugged, started the car, and it idled fine, but did not throw a code??? Just wondering.
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Joined: Nov 2001
Posts: 2,428
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From: Fairview Heights Illinois
Car: 1986 Irocz
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.25:1
Re: IAC diagnosis question?
I have suspected that the IAC in my 89 IROC 5.7 is faulty, but my question is if the IAC is unplugged and you start the car should it idle normally and throw a code to the ECM. The reason I ask is because I had it unplugged, started the car, and it idled fine, but did not throw a code??? Just wondering.
No code is normal.
If you have a slightly high idle right after a cold start, but it settles down after a couple of minutes, then your IAC is probably functioning just fine.
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