Question about 1993 Saturn SL1

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1999 saturn sl1

When i start the car it shoots up to 2500 rpm, then goes down to 1000. when we put the car in park after driving the rpm goes up to 2000 an d stays there. the check engine soon light goes on and off, there is a loud vibration in the car too.

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Sounds like you have one of two problems. If the car has over 80,000 miles on the odometer, your idle air control motor (basically an electrical solenoid valve which allows additional air into the motor past the closed throttle valve) is sticking open.
The other possibility is a vacuum leak. I would try removing the IAC (idle air control motor) and cleaning it using aerosol carb or throttle body cleaner. This is available at any auto parts store. Re-install the valve and see if there is an improvement. If it improves but reverts to it's old behavior (usually within a day to a week) you will need to replace the valve.
Charlie

Posted on Jun 25, 2008

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