How to do the Idle relearn procedure?

Tiny
MARY.SAVATOVIC
  • MEMBER
  • 1992 CHEVROLET LUMINA
  • 3.1L
  • 6 CYL
  • AUTOMATIC
  • 78,700 MILES
I replaced the idle air control valve because the car wouldn't stay started without giving gas when cold. It starts great now and idles normally until I shift into drive. When in drive the idle surges up and down erratically. I think I may need to do an idle relearn, but I am not sure how as there are many different instructions for this on the internet. I tried pulling the ECM fuse for about a minute, starting and letting car run in park for 5 minutes, putting foot on brake and sitting in drive for another 5 minutes, and check engine light came on and idling seemed to get worse.
Wednesday, February 8th, 2023 AT 4:43 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

Have you driven the vehicle to see if it relearns on its own? I ask because the directions I have indicate the use of an OBD1 scan tool for relearning the IAC.

Take a look below and let me know if you have any access to this type of scanner.

Let me know.

Joe

See pic below.
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Wednesday, February 8th, 2023 AT 1:59 PM

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