Engine Idle Rolls Up and Down: Ford E-350 Super Duty Engine & Powertrain

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.

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Ford E-350 Super Duty vehicles with this problem

2 model years affected

1993 Ford E-350 Econoline

1992 Ford E-350 Econoline

1993 Ford E-350 Econoline

1992 Ford E-350 Econoline

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Engine Idle Rolls Up and Down on Ford E-350 Super Duty

Problem overview

Ford E-350 Super Duty vehicles with this problem

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