Spark Plug: Adjustment

Clean the spark plugs using a wire brush.

Clean and remove the carbon or oxide deposits.

But do not wear away ceramic insulator.

If deposits are too stubborn, replace the plugs.

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

Courtesy of SUBARU OF AMERICA, INC.