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Spark plug deposits, active fuel management
Have this car in for engine noise on cold startup, found the TSB regarding lifter replacement. However on pulling the spark plugs found heavy oil deposits on the ground electrodes of the deactivated cylinders. The plugs have 30K miles on them, Is this a normal... Login to read more. 
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| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2008 Pontiac Grand Prix GXP 5.3L
| Engine | 5.3 L |
| Trans | 4-speed Automatic (Electronic) |
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