fast idle
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
If I was to guess on yours, I would say coolant temperature sensor. I was just looking on rockauto.com parts site and they gave an explanation of what the coolant temperature sensor will do when bad. Look up coolant temperature sensor and they list the different brands of said part and click on more info. I think this explanation was listed under one of the Standard brand coolant temperature sensors. I'll try to remember to keep updated, may be a few days. Good luck with your truck.
Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
Update to my reply last night under No. 4. I cleaned the throttle body and replaced the throttle position sensor while I had the throttle body off. It would have been impossible to replace the throttle position sensor without unbolting the throttle body. Low and behold my high idle problem is GONE. I can't see how a dirty throttle body would cause a fast idle, although the throttle body was really grimy. So a bad throttle position sensor must have been my problem.
Senior User
Joined: Jun 2011
Posts: 382
Likes: 0
From: Milford, CT
... we still don't know if there even is a high idle problem. OP hasn't been on since the morning after making the thread.
-Mike
-Mike
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high idle
It is a fast idle. I am going to try the collant sensor this weekend. the idle air control did not help. thanks for the help
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Cargo Master
Joined: Jan 2004
Posts: 3,118
Likes: 149
From: South Dakota
The Haynes repair manual gives a lot of information on testing the different sensors and even what codes point to which sensor is bad. But I guess I don't have the patience to read all that. I was so sure that the throttle position sensor wouldn't fix my fast idle that I ordered a coolant temperature sensor when I picked up the TPS.
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