Spark Plug: Adjustment
WARNING: This page is about a different car, the 2005 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Adjust the spark plug gap, if necessary, by measuring with a gap gauge.
Spark plug gap: L
1.0 -1.1 mm (0.039 - 0.043 in)
Courtesy of SUBARU OF AMERICA, INC.
NOTE:
Replace with a new spark plug if the area (A) is worn to spherical shape.