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Ignition Timing - 4.9L

NOTE: Some engines are equipped with a socket for a magnetic probe timing meter, located 9.5 degrees ATDC. DO NOT  use this location for setting timing using a conventional timing light.
  1. Place transmission in Park. Ensure engine is at normal operating temperature. Turn A/C and all accessories off. Ensure system is not in diagnostic mode.
  2. Jumper ALDL test terminals "A" and "B". See Fig 1. Connect timing light to spark plug No. 1 wire. Check ignition timing, and adjust if necessary. See IGNITION TIMING SPECIFICATIONS  table. Tighten distributor, and recheck timing. Remove jumper from ALDL test connector.
    3. Fig 1: Identifying ALDL Connector Terminals
    G90C13245Courtesy of GENERAL MOTORS CORP.
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