Question about 1999 Saturn SL
The Idle Air Control valve is located on the throttle body. If you follow the intake tube from your air filter all the way back to the intake manifold, where the intake tube connects to is the throttle body. Remove the intake tubing and you can see the throttle body.
There are two sensors on the throttle body and a vacuum line. You'll see two harnesses going to the throttle body, one is the IAC.
However, a quick diagnostic check can be done without touching the throttle body to confirm your problem. If the car has a normal idle when initially started but then rises to a higher idle and stays there BUT then if you were to shut the car off and restart it and it comes back to normal that is the Throttle Position Sensor (TPS). This is also located on the throttle body (the other sensor to the IAC). If it is the IAC it will be high and maybe fluctuate a bit.
Posted on Mar 31, 2010
Testimonial: "I was the one who listed this problem. Thanks a TON for the info. Now, I'll try to fix it. The ultimate check is if if idles normally."
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Posted on Jan 02, 2017
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