subaru Workshop Repair Guides

Subaru Workshop Service and Repair Manuals

Transmission Control Systems > < Spark Plug|Removal and Installation|Page 2708
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Spark Plug: Service and Repair
Cleaning and Regapping

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.

Transmission Control Systems > < Spark Plug|Removal and Installation|Page 2708