Mechanics

ANY HEARD OF A "IDLE LEARN" PROCEDURE FOR 92 OLDS 3.1?

1992 Oldsmobile Cutlass • 330,000 miles

92 olds cutlass supreme. Replaced ECM, made sure numbers matched, used original prom. Car starts but surges at idles from 500-1500 rpm. Dangerous to put it in gear as the brakes feel hard and car lurches forward. Can rev to over 2000 and it smoothes out sounds great. But pressing gas pedal between surge speed and getting to 2000 rpm feels like no response - the pedal presses down but there is no response until 1/3 to the floor then it jumps to 2000+rpm and smoothes out.
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Bus933s
September 15, 2012.



BTW, the car ran fine until the ignition control module went out. Probably didnt need to replace ecm but did anyway out of frustration for diagnosing issue. Replaced ICM and that fixed the no-start problem. Nothing else has changed.

Tiny
Bus933s
Sep 15, 2012.
Oh yeah, and the service engine light is on at idle, but once I hold it over 2000 rpm for several seconds the light goes out, until I let it idle again.

Tiny
Bus933s
Sep 15, 2012.
Sounds like more of the idle air control motor.

ASEMaster6371
Sep 15, 2012.
Get the trouble codes and let us know what it is.

KHLow2008
Sep 16, 2012.
Thanks for the reply but after some serious snooping I found a vacuum line disconnected. Runs fine now.

Tiny
Bus933s
Sep 16, 2012.
Glad to know it is an easy fix.

Have a nice day.

KHLow2008
Sep 16, 2012.