Outback F4-2.5L (2008)
Spark Plug: Adjustments
ADJUSTMENT
Clean spark plugs with a nylon brush, etc. Clean and remove the carbon or oxide deposits. If deposits are too stubborn, replace the spark plugs. After
cleaning the spark plugs, measure the spark plug gap using a gap gauge.
NOTE:
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Never use plug cleaner.
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Do not use metal brush or it will wear insulator.