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Username Post: 4. Erratic Idle, stall 1989 4.3 S-10
paulo57509 
Senior Member
Posts: 398

Loc: Tracy, CA
Reg: 07-18-00
06-06-19 02:51 PM - Post#2767846    
    In response to gchemist

My '92 Lumina does this anytime the battery is disconnected. IIRC, it has something to do with the IAC losing calibration from the ECM or some such.

It takes a Tech II scan tool to recalibrate the IAC idle learn.

An alternative to the Tech II is to start with a cold engine and set the parking brake HARD, start the engine and put the transmission in drive. Let the engine idle and allow it come up to operating temperature; I let the cooling fans cycle 2 or 3 times - it'll take a while. This should get the idle back to normal.
1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari

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