Engine high idle

2000 SATURN SL2
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UNDEADMAGE
  • MEMBER
  • 1 POST
engine light on after replacing spark plugs and spark plug wires. idles a bit high and when i put into park sometimes revs up yo 3000 rpm. when i turn of and start goes back to normal. what part do i need to replace?
Feb 22, 2010 at 5:07 AM
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SQM
  • ✓Experienced Mechanic
  • 6,383 POSTS
Hello,

It sounds like you might have a faulty Idle air control valve (IAC).
The IAC control the idle and a faulty IAC can cause the idle to be unusually high.
That valve can be serviced.
Simply take the IAC off of the throttle body and clean it out with good quality parts cleaner. Wait for everything to dry and reinstall.

Here are some helpful article on how to service the IAC:

https://www.2carpros.com/articles/how-a-idle-air-control-valve-works
https://www.2carpros.com/articles/idle-air-control-valve-service
https://www.2carpros.com/articles/engine-idles-too-high

I have also attached the diagrams for the IAC.

Please let me know of any questions.

Thank you.
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Aug 4, 2021 at 7:40 AM
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