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Subaru
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2003
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Impreza F4-2.5L SOHC
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Repair and Diagnosis
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Powertrain Management
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Ignition System
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Spark Plug
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Service and Repair
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Cleaning
Cleaning
CLEANING
Clean the
spark plugs
in a sand blast type cleaner. Avoid excessive blasting. Clean and remove the carbon or oxide deposits. When doing this, do not wear away the ceramic part.
If deposits cannot be removed, replace the spark.