Engine Idle Rolls Up and Down on Ford E-250
Problem overview
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.
7 people reported this problem
2 commentsFord E-250 vehicles with this problem
Average mileage: 166,000 miles
(116,000 - 216,000)
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