Subaru Impreza 2003, Service Manual

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PM-12
PERIODIC MAINTENANCE SERVICES
SPARK PLUGS
5. Spark Plugs
A: REPLACEMENT
1. SOHC MODEL
1) Remove the intake duct and intake chamber.
2) Remove the washer tank and put it aside.
3) Disconnect the spark plug cord.
4) Remove the spark plug with a plug-wrench.
5) Set the new spark plugs.
Recommended spark plug:
1.6 L SOHC model (with catalytic converter)
CHAMPION: RC8YC4
NGK: BKR6E-11 (Alternate)
1.6 L SOHC model (without catalytic convert-
er)
NGK: BKR6E
2.0 and 2.5 L SOHC model (with catalytic con-
verter)
CHAMPION: RC10YC4
NGK: BKR5E-11 (Alternate)
2.0 SOHC model (without catalytic converter)
NGK: BKR6E
6) Tighten the spark plug lightly with hand, and
then secure with a plug-wrench to the specified
torque.
Tightening torque:
21 N·m (2.1 kgf-m, 15.2 ft-lb)
NOTE:
• Be sure to place the gasket between the cylinder
head and spark plug.
• If a torque wrench is not available, tighten the
spark plug until gasket contacts cylinder head; then
tighten further 1/4 to 1/2 turns.
2. DOHC MODEL
1) Disconnect the battery cables, and then remove
the battery and battery carrier.
2) Remove the washer tank and put it aside.
3) Remove the air cleaner lower case.
4) Disconnect the connector from ignition coil.
5) Remove the ignition coil.
6) Remove the spark plug with a spark plug socket.
7) Set new spark plugs.
Recommended spark plug:
2.0 L DOHC Turbo model
NGK: PFR6G
8) Tighten the spark plug lightly with hand, and
then secure with a plug-wrench to the specified
torque.
Tightening torque:
21 N·m (2.1 kgf-m, 15.2 ft-lb)
9) Tighten the ignition coil.
Tightening torque:
16 N·m (1.6 kgf-m, 11.7 ft-lb)
NOTE:
• Be sure to place the gasket between the cylinder
head and spark plug.
• If a torque wrench is not available, tighten the
spark plug until gasket contacts cylinder head: then
tighten further 1/4 to 1/2 turns.
PM-00001
PM-00145
PM-00112