Engine Ignition System (H4SO) (Except Sti): Adjustments Subaru Impreza GH

ADJUSTMENT

Clean spark plugs with a nylon brush, etc. Clean and remove the carbon or oxide deposits. If deposits are too stubborn, replace the spark plugs. After cleaning the spark plugs, measure the spark plug gap using a gap gauge.

Note. Never use plug cleaner. Do not use metal brush or it will wear insulator.

Spark plug gap L: 1.0 - 1.1 mm (0.039 - 0.043 in)

Scheme 18

Scheme 19

Scheme 20

1. Disconnect the ground cable from battery.
2. Disconnect the spark plug cords from ignition coil and ignitor assembly.
3. Disconnect connector (A) from the ignition coil and ignitor assembly.
4. Remove the bolt (B) which secures the ignition coil and ignitor assembly to intake manifold.