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Home >> Subaru >> 2007 >> Forester X, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Ignition System (H4DOTC)) >> Spark Plug >> Adjustment

Spark Plug: Adjustment

WARNING: This page is about a different variant/trim than selected.

Clean the spark plugs using a wire brush.

Clean and remove the carbon or oxide deposits.

But do not wear away ceramic insulator at this time.

If deposits are too stubborn, replace the spark plugs.

After cleaning the spark plugs, measure the spark plug gap using a gap gauge.

NOTE: Do not use a plug cleaner because the spark plugs are applied with iridium tip.

Spark plug gap: L 0.7 - 0.8 mm (0.028 - 0.031 in) 

Fig 1: Identifying Spark Plug Gap
G04997929Courtesy of SUBARU OF AMERICA, INC.