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Home >> Chevrolet >> 1994 >> Lumina APV Van Cargo >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Ignition Timing >> Ignition Timing >> Except 3.8L VIN L
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Except 3.8L VIN L

  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. By-pass connector is located near right front strut tower in engine 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.
3.1L (VIN D) 10 @ Idle 10 @ Idle
3.8L (VIN L) (1) (1)
(1) Ignition timing is not adjustable (DIS).
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