Subaru 2002 Impreza Service Manual page 209

SPARK PLUG
Ignition
2. Spark Plug
The spark plug has a platinum tipped electrode. The thread diameter is 14 mm (0.551 in) and the
gap is controlled to a value between 0.7 and 0.8 mm (0.028 and 0.031 in).
-&--Gap: 0.7
-
0.8 mm (0.028 - 0.031 in)
NF0317
r .
IG-3