1998 Ford F-150 Repair Question
Adjusting rpms/1998 ford F-150/ 4.2/ 131,000 mi
Should be 680-830 when warm. The idle speed is not adjustable.
things that can cause high idle.....Vacuum leaks, throttle plate and linkage, speed control linkage binding, intake air tube leaks, intake manifold, and itmes attached for leaks, such as EGR, and IAC.
If not leaks, I would suspect a bad IAC valve.
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