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.
JB13 CHECK THE SPARK PLUGS
• Ignition OFF.
• Remove and inspect the spark plugs for damage, wear, carbon tracking or deposits and correct spark plug gap.
Are the plugs OK?
Yes | No |
|---|---|
GO to JB14 . | REPAIR the spark plugs. ADJUST the gap or INSTALL a new spark plug as necessary. REFER to the Workshop Manual Section 303- 07, Engine Ignition. Clear the PCM DTCs. REPEAT the self-test. |
JB14 CHECK THE SPARK PLUG RESISTANCE
• Measure the spark plug resistance.
Is the resistance between 2,000 ohms and 12,000 ohms at a room temperature of 25°C (77°F)?
Yes | No |
|---|---|
GO to JB15 . | INSTALL a new spark plug. REFER to the Workshop Manual Section 303-07, Engine Ignition. Clear the PCM DTCs. REPEAT the self-test. |
JB15 TEST DIRECTION FOR SYMPTOM CHARTS
Were you directed to this pinpoint test from Section 3?
Yes | No |
|---|---|
RETURN to Section 3 , Symptom Charts for further direction. | GO to JB16 . |
JB16 TEST DIRECTION FOR PINPOINT TEST HD
Were you directed to this pinpoint test from pinpoint test step HD8?
Yes | No |
|---|---|
GO to HD9 . | The concern is intermittent. GO to Pinpoint Test Z . |
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.