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Idles high and low

Tiny
CARLADAY
  • MEMBER
  • 1994 SATURN
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
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Thursday, April 3rd, 2014 AT 8:50 AM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,625 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
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Monday, January 29th, 2018 AT 5:28 PM
Tiny
CARLADAY
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  • 1 POST
You nailed it once I replaced the IAC motor the car run great! Thanks :)
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Monday, January 29th, 2018 AT 5:28 PM

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