Car Problem Reports

Ford E-150 Engine Idle Rolls Up and Down

Ford E-150 Problem
4 Reports
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Model Years Affected: 1992, 1993, 1995

Engines Affected: 4.6L V8, 5.8L V8


If engine idle rolls up and down, and diagnosis rules out Idle Air Control (IAC) valve issues and vacuum leaks, the Programmable Speedometer/Odometer Module (PSOM) can be at fault electronically. The instrument cluster will need to be replaced, the PSOM is inside the cluster.

  • lmagill, , 4.6L V8, 120,000 mi

    The engine would randomly 'race' without warning. I would have to keep foot on brake at stoplights etc. to keep it from 'jumping out' into traffic. We tried vacuum hoses, egr valve. Doing it again.

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