High idle
20

Asked by Shaggy0585 May 06, 2016 at 04:03 PM about the 1992 Buick Skylark Sedan FWD

Question type: Maintenance & Repair

My car was having problems with high idle
and the speedometer would only work once
in a while. I just replaced the ECM and
everything is working again all except the
high idle. When I start the car it runs at 3000
rpm and when I drive it around it ildes at
2100 rpm. I have no vacuum leakes
anywhere. Please help.

4 Answers
30,500

mikeatpriestlake answered 8 years ago

check for codes. google, "how to read gm obd1 codes" could be throttle position sensor or idle air control valve.

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20

Shaggy0585 answered 8 years ago

It's got a new idle air control valve and the service engine light is not on. Could a blown donut gasket cause the high idle?

2 people found this helpful.
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30,500

mikeatpriestlake answered 8 years ago

Not sure what you mean by "donut gasket", but check for codes whether the light is on or not. Try cleaning the throttle body.

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30,500

mikeatpriestlake answered 8 years ago

It also occurs to me that since you replaced the ecm, you may have to do an "idle relearn procedure" google it for your gm car.

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