A defective thick film ignition (TFI) module can cause the engine to stall while driving, or the engine may not start. A failed TFI module will require replacement.
Problems for specific Ford E-150 years:
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Most reported Ford E-150 problems
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.
This concern is relating to the AOD automatic transmission typically seen mated with the 4.9L 6 cylinder and 5.0L V8 engines. If the Throttle Valve Cable (TV cable) becomes detached from the throttle valve, transmission shifts can be hard or delayed. The grommet that secures the TV cable to the throttle should be replaced. Our technicians note that delaying repair of this concern can lead to internal transmission damage due to the abnormally high internal pressures present when the cable is detached.
Sludge build up on the throttle plate and/or idle air control valve can cause a poor engine idle, stalling, and/or hesitation – especially when the engine is still cold. The correction is to install a new idle air control valve spacer kit to prevent the sludge build up.
Rough idle, stalling at let off on road and at idle. Excess gas consumption and several error codes set. Excess raw gas smell and high gas consumption. Checked gas pressure at injector rail and found it to be three times greater than specs. Changed gas bypass relay & this corrected all codes and drivability problems.
This concern related to the 4R100 automatic transmission typically seen mated to the 5.4L V8. If the transmission does not shift correctly out of first gear, a “one-way” clutch inside the transmission may have failed. If the transmission fluid condition is good, and other failures are not found upon transmission tear down, the one-way clutch may be replaced along with the drum and friction plates. Our technicians note this is a major internal transmission repair.