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Engine has high idle?

Tiny
JGANAWAY
  • MEMBER
  • 1993 FORD F-150
  • 4.9L
  • 6 CYL
  • 4WD
  • MANUAL
  • 275,000 MILES
When I start the truck in the morning, especially when it's cold or cool, it acts as if it has a stuck choke, I know EFI doesn't have a choke. So where should I look? After I let it warm up some and turn it off then restart, it idles down as it should.
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Wednesday, March 17th, 2021 AT 7:34 AM

1 Reply

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

It sounds like you might be having an issue with the IAC - idle air control motor. Here are 2 tutorials for you to view relating to IAC motor cleaning and replacement:

https://www.2carpros.com/articles/idle-air-control-valve-service

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

I've attached picture steps below showing how to replace the IAC on your truck. Hope this helps and thanks for using 2CarPros.
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Thursday, March 18th, 2021 AT 12:51 AM

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