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Ignition Timing

NOTE: Timing instrument should be connected to No. 1 one spark plug wire using an adapter or clip-on connector. Do not puncture spark plug wire or boot to make connection.
  1. Turn off all lights and accessories. Set parking brake and place transmission in Neutral. Ensure A/C and heater are off. Connect timing light and disconnect the single wire in-line spout connector or remove the shorting bar from the double wire spout connector.
  2. Start engine and warm to normal operating temperature. Check timing and adjust if necessary. Reconnect spout connector or reinstall shorting bar. Check timing advance to verify distributor is advancing properly. Remove tachometer and shut off engine.
IGNITION TIMING (DEGREES BTDC @ RPM)

Application A/T M/T
2.8L (1) 10 @ 850 10 @ 750
Calif. Man. Trans. (2) 14 @ Idle 14 @ Idle
(1) Idle speed and timing are controlled by EEC-IV system and are nonadjustable.
(2) 1985 Models.
IGNITION TIMING (1)

Application M/T A/T
2.8L (2)
All except Ca. 10 @ 850 10 @ 750
Calif. Man. Trans. (3) 14 @ Idle 14 @ Idle
2.9L (4)
Calif. 2WD 10 @ 900 10 @ 800
All Exc. Calif. 2WD 10 @ 850 10 @ 800
3.0L (4) 10 @ 990-1090 10 @ 875-975
(1) Idle speed and timing are controlled by EEC-IV system and are nonadjustable.
(2) With auto. trans. in "D"; man. trans. in "N".
(3) 1985 Models.
(4) With auto. trans. and man. trans. in "N".
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