Ignition Timing: Adjustments

ADJUSTMENT CONDITIONS:
Coolant temperature, 170°F-190°F.
All accessories, Off.
Transmission, N (Neutral).
Parking Brake, ON.

1. Connect tachometer and timing light.
2. START and run the engine at curb idle speed.
Standard value
Curb idle speed 850 ± 100 rpm

ignition adjustment terminal:

3. When checking basic timing at altitudes above 3,900 ft. stop the engine and disconnect the water-proof female connector from the ignition timing connector. Connect a lead wire with an alligator clip to the ignition timing adjusting terminal to ground it.
4. Check basic ignition timing and adjust if necessary.
Standard value
Basic Timing 10° ± 2° BTDC

5. To adjust timing, loosen distributor lock nut and turn distributor housing.
6. After adjustment, securely tighten holding nut.
CAUTION: Be careful, when tightening the nut, that the distributor does not move.

7. STOP the engine.
8. START and run the engine at curb idle speed.
9. Check to be sure that the idle ignition timing is correct.
Standard value
Idle Timing 10°BTDC


10. Disconnect the lead wire if above 3,900 ft. and verify that the timing has advanced above the basic timing.

Standard value
Idle Timing 15°BTDC