Impreza RS Coupe AWD F4-2.5L SOHC (1999)
4. Remove the two bolts which hold the washer tank, then take the tank away from the working area.
5. Remove #4 spark plug cord by pulling boot, not cord itself.
6. Remove spark plug with the spark plug socket.
7. Installation is in the reverse order of removal.
Tightening torque (Spark plug):
20.6 ± 2.9 Nm (2.10 ± 0.30 kg.m, 15.19 ± 2.14 ft.lb)
CAUTION: The above torque should be only applied to new spark plugs without oil on their threads. In case their threads are lubricated, the
torque should be reduced by approximately 1/3 of the specified torque in order to avoid over-stressing.
