Common Symptoms
- Check engine light illuminated
- Rough idle or engine misfire on cylinder 8
- Reduced engine power or hesitation during acceleration
- Increased fuel consumption
- Engine runs rough under load
- Possible black smoke from exhaust
Most Likely Root Causes
- Faulty fuel injector on cylinder 8
- Damaged or shorted fuel injector wiring harness
- Corroded or loose fuel injector connector
- Failed powertrain control module (PCM) injector driver circuit
- Short to voltage in injector circuit wiring
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Component Location
Cylinder 8 fuel injector is located on the driver side cylinder head at the rear position on V8 engines or in the corresponding position on inline engines.
Manufacturer Notes
Some Ford and GM V8 engines have known issues with injector harness chafing against engine components causing intermittent high circuit codes.
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