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Home >> Ford >> 1990 >> F-Super Duty 7.3 M, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Dis Ignition System Check - No Start (2.3L) >> Test 5, Determine Missing Spark Combination
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Test 5, Determine Missing Spark Combination

During cranking, is spark missing from both cylinders No. 1 and 4, or is spark missing from both cylinders No. 3 and 2 plug wires? If spark is missing, go to TEST 7. If spark is present, go to TEST 6.

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