Spark Plug: Adjustment
WARNING: This page is about a different car, the 2007 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.
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.
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)