Fast/High idle ? No engine light.
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Fast/High idle ? No engine light.
A few weeks ago my truck suddenly started to have a very high idle. Instead of idling around 750rpm it now idles 1500-2000rpm, and it drops down to about 1100rpm after it warms up. The truck drives perfectly fine otherwise, no engine light and nothing obviously wrong. A couple years ago I replaced the idle control valve, but when that went I got a check engine light. Now it doesn't show any problem aside from the high idle. What to check?
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Joined: Dec 2008
Posts: 439
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From: Lubbock, Texas
We need some information about your truck, engine, year before we can help. It sounds like you have a gasser based on replacing the IAC...sounds like a similar issue or a major vacuum leak in the "S" hose under the throttle body. Provide some vehicle information and we will see if we can help.
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It's an 04 F250 SD with the 5.4 gas engine. The idle control valve was done 1-2 years ago, I did try spraying carb cleaner around to see if there was a vacuum leak but nothing happened. How do I clean the IAC? That is the idle control valve?
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The check engine light finally came on, and it gives code P0122, which indicates a bad TPS. I bought a new one, and replaced it just as I did almost exactly 3 years ago. This didn't solve the issue, I still have the light and the code. I can see no bad wiring, so I'm not sure what the problem is. Ideas?
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