Differential Pressure Feedback Electronic (DPFE) Sensor
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford Econoline, 1995 Ford Club Wagon, and 1995 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
Faults in DPFE sensor or circuit should set a Diagnostic Trouble Code (DTC). See QUICK TEST in TESTS W/CODES - EEC-IV (5.0L) article. If no DTC has been set, see CIRCUIT TEST DL in TESTS W/CODES - EEC-IV (5.0L) article.