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Home >> Chevrolet >> 1994 >> Astro Van Cargo Extended, 4.3 W, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Ignition Timing >> Ignition Timing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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 IGNITION TIMING  . Reconnect EST by-pass connector, and clear ECM trouble code.
IGNITION TIMING (DEGREES BTDC @ RPM)

Application Man. Trans. Auto. Trans.
4.3L (VIN W & Z) 0 @ Idle 0 @ Idle
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