Operation CHARM
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Subaru
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2002
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Forester S F4-2.5L SOHC
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Repair and Diagnosis
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Powertrain Management
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Tune-up and Engine Performance Checks
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Spark Plug
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Service and Repair
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Cleaning
Cleaning
CLEANING
Clean
spark plugs
in a sand blast type cleaner.
Avoid excessive blasting. Clean and remove carbon or oxide deposits, but do not wear away porcelain.
If deposits are too stubborn, replace plugs.