Ignition Timing: Inspection

CAUTION: After warming-up, engine becomes very hot. Be careful not to burn yourself during measurement.

Warm-up the engine.
To check the ignition timing, connect a timing light to #1 cylinder spark plug cord, and illuminate the timing mark with the timing light.
Start the engine at idle speed and check the ignition timing.
Ignition timing [BTDC/rpm]:
1. MT; 10° +/- 8°/650 rpm
2. AT; 15° +/- 8°/700 rpm
Fig 1: Checking Ignition Timing
Courtesy of SUBARU OF AMERICA, INC.

If the timing is not correct, check the ignition control system. Refer to IDLE SPEED & IGNITION TIMING .