Subaru 2002 IMPREZA Service Manual page 1159

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D: ADJUSTMENT

Clean the spark plugs in a sand blast type cleaner.

Avoid excessive blasting. Clean and remove the

carbon or oxide deposits, but do not wear away

If deposits are too stubborn, replace the plugs.

After cleaning the spark plugs, recondition the firing

surface of electrodes with file. Then correct the

spark plug gap using a gap gauge.

Spark plug gap: L

0.7 — 0.8 mm (0.028 — 0.031 in)

Replace with a new spark plug if this area (A) is

worn to "ball" shape.

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2001 impreza