Test 5, Determine Missing Spark Combination
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.
If during cranking spark is missing from both cylinders No. 1 and 4 plug wires or both cylinders No. 2 and 3 plug wires, go to next test. If spark is present, go to TEST 7.