Base idle speed - 1990 Sunbird - Maintenance and Repair Forum

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Base idle speed - 1990 Sunbird
Thursday, August 29, 2019 4:33 PM
Hello,

I recently purchased a 1990 Pontiac Sunbird LE (coupe, non-turbo, 3 A/T).

When I got the car, the idle was always at 2500rpm. Turned out to be the PCM. Changed it and it now runs quite well. Iíve got a little problem though: the previous owner played with the base idle screw to try and lower the idle speed. I would now like to set it back to where it is supposed to be. Any of you know the correct procedure to set the base idle speed so that the car doesnít go crazy with the IAC adjustments?

Thanks in advance!

Re: Base idle speed - 1990 Sunbird
Friday, August 30, 2019 7:05 AM
Back the screw out until it is no longer touching the throttle lever. Then turn it in until it just touches the throttle lever. Once it makes contact with the lever, turn the screw in 1 and 1/2 turns.
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