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Home >> Cadillac >> 1990 >> Allante F7/ME9 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - On-Vehicle Adjustments >> Ignition Timing >> Set Ignition Timing
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Set Ignition Timing

  1. Refer to the tune-up label located in the engine compartment. Follow all instructions on the label.
  2. 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.
  3. NOTE: Do not time engine on seven cylinders as the unburned fuel could cause damage to the catalytic converter.
    Fig 1: Identifying Firing Order
    G00128323Courtesy of GENERAL MOTORS CORP.
    Fig 2: Locating ALDL
    G00087900Courtesy of GENERAL MOTORS CORP.
    Fig 3: Identifying ALDL Terminals
    G90B01199Courtesy of GENERAL MOTORS CORP.
  4. 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).
  5. 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.
  6. Turn off the engine and remove the timing light. Reconnect the number one spark plug wire, if removed.
Fig 4: Identifying Magnetic Timing Probe Hole
G00113476Courtesy of GENERAL MOTORS CORP.