idles high and low

1994 SATURN
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CARLADAY
  • MEMBER
  • 1 POST
Hi! I have a 1994 Saturn s.series. it cranks and runs fine until it geys hot. When it gets hot it idles high and low. Sometimes when it idles low it dies and will not start again untill cool. Check engine light never comes on. We have replaced the map sensor & pcv
Apr 3, 2014 at 1:50 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,588 POSTS
Hello,

It sounds like you have an IAC motor that is malfunctioning when it gets warm. We should run the codes first.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If no codes I would try to replace it with a new one to see what happens.

This guide can help as well.

https://www.2carpros.com/articles/engine-idles-too-high

and

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Please let us know what happens.

Cheers, Ken
Jan 29, 2018 at 9:28 AM
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CARLADAY
  • MEMBER
  • 1 POST
You nailed it once I replaced the IAC motor the car run great! thanks :)
Jan 29, 2018 at 9:28 AM
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