Set Ignition Timing
- Refer to the tune-up label located in the engine compartment. Follow all instructions on the label.
- With ignition off, connect the pick-up lead of timing light to the number one spark plug. Use a jumper lead between the wire and plug or an inductive type pick-up. Do not pierce the wire or attempt to insert a probe between the boot and the wire. Connect the timing light power leads according to manufacturer's instructions.
- Jumper pins A and B together at the ALDL connector while not in diagnostic display. See Fig 2 and Fig 3 . The "Set Timing" message should appear on the CCDIC (engine RPM less than 900).
- Start the engine, and aim the timing light at the timing mark. See Fig 4 . The line on the pulley will line up at the timing mark. If a change is necessary, loosen the distributor hold-down clamp nut with special tool J-29791 at the base of the distributor. While observing the mark with the timing light, slightly rotate the distributor until the line indicates the correct timing. Tighten the hold-down nut and re-check the timing.
- Turn off the engine and remove the timing light. Reconnect the number one spark plug wire, if removed.
NOTE:
Do not time engine on seven cylinders as the unburned fuel could cause damage to the catalytic converter.