Test 9, Check Dis Module Mounting Screws
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1991 Ford Ranger, 1991 Ford RV Cutaway, 1991 Ford Pickup, 1991 Ford F-Super Duty, and 1991 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Check DIS module mounting screws for corrosion or looseness. If mounting screws are clean and tight, replace DIS module, and check for fault codes. If screws are not clean and tight, clean or replace screws. Clean mounting area on DIS module. Check for fault codes. If vehicle still does not start, go to next test.