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V6 Ignition Timing

  1. Set parking brake, block drive wheels and place transmission in Neutral or Park. Warm engine to normal operating temperature. Turn A/C off (if equipped). Ensure Malfunction Indicator Light (MIL) is off.
  2. Disconnect Tan/Black Electronic Spark Timing (EST) by-pass connector wire. On 4.3L, by-pass connector is on wiring harness conduit near distributor. On other models, by-pass connector is located near heater housing in passenger compartment. On all models, DO NOT  disconnect 4-wire connector at distributor.
  3. Connect timing light to No. 1 spark plug wire. Check timing and adjust if necessary. See V6 IGNITION TIMING . Reconnect EST by-pass connector, and clear ECM trouble code.
V6 IGNITION TIMING (DEGREES BTDC @ RPM)

Application Man. Trans. Auto. Trans.
4.3L (VIN Z) (1) 0 @ Idle 0 @ Idle
(1) Ignition timing is not adjustable with DIS.
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