Idle learn procedure? Is it required? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-08-2005, 11:02 AM   #1
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Default Idle learn procedure? Is it required?

My '92 SSE */c has always had a rough idle, and it'* become worse recently. I've done several things to attempt to fix the problem, but nothing has made a difference in the idle quality.

I've read that there'* an idle learn procedure for some other cars, or a Tech1 scan tool can be used to do it, but do any of you know whether or not performing the idle learn procedure is required to yield a smooth and stable idle? My understanding is that after the battery is disconnected and reconnected the system learns on its own over time anyway, so does performing the idle learn procedure just shorten the required learning time, or does it do something that the system will never do on its own?

Please comment if you know with certainty.
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Old 06-08-2005, 08:34 PM   #2
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I think it'* only 96+ with OBD II that have to have anything "Learn" wise done. Only thinki I can think of is after reconnecting the battery turn the key on for 30 seconds and don't touch nothing and the PCM will learn the 0 input readins. But I don't think that will help you at all.
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Old 06-08-2005, 09:02 PM   #3
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No true learn procedure...

Usually you will start the car after having reconnected the battery...

Once up to temp you will drive the car over 40mph at which time the PCM will relearn the IAC...

Have you removed the Throttle body, cleaned it to like new condition, including removing the IAC valve, and cleaning the passages for it in the throttle body, as well as the tip of the IAC..<--- Only the tip...?

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Old 06-09-2005, 10:43 AM   #4
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Yes, I recently cleaned the throttle body and the IAC again, even though it had only been about 20,000 miles since I last cleaned them. The throttle body was still pretty clean, and only the tip of the IAC was dirty. Cleaning made no difference in the idle quality.
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