Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Is the spark pattern inconsistent?
Yes | No |
|---|---|
INSPECT the spark plug wires for missing cylinders. MEASURE the resistance of the spark plug wires. INSTALL a new spark plug wire if the resistance is greater than 7,000 ohms per 30.5 cm (1 foot). REFER to the Workshop Manual Section 303-07, Engine Ignition. Clear the PCM DTCs. REPEAT the self-test. GO to JE2 . | GO to JC7 . |
JC7 CHECK FOR A HIGH SPARK PLUG FIRING VOLTAGE
• Observe for a high spark plug firing voltage.
Is the average value of the spark plug firing voltage greater than 15 kV?
Yes | No |
|---|---|
INSPECT the spark plug wires for missing cylinders. MEASURE the resistance of the spark plug wires. INSTALL a new spark plug wire if the resistance is greater than 7,000 ohms per 30.5 cm (1 foot). REFER to the Workshop Manual Section 303-07, Engine Ignition. Clear the PCM DTCs. REPEAT the self-test. | GO to JC8 . |
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.