Tribute 4WD L4-2.5L Hybrid (2009)
Spark Plug: Testing and Inspection
SPARK PLUG INSPECTION
1. Inspect the spark plug for a bridged gap.
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Check for deposit build-up closing the gap between the electrodes. Deposits are caused by oil or carbon fouling.
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Install a new spark plug.
2. Check for oil fouling.
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Check for wet, black deposits on the insulator shell bore electrodes, caused by excessive oil entering the combustion chamber through worn
rings and pistons, excessive valve-to-guide clearance or worn or loose bearings.
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Correct the oil leak concern.
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Install a new spark plug.
