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Home >> GMC >> 1991 >> Value Van 5.7 K, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Ignition Timing (Gasoline) >> V6 Ignition Timing >> 3.1L (VIN D)

3.1L (VIN D)

  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 SERVICE ENGINE SOON light is off.
  2. Ground Tan/Black Electronic Spark Timing (EST) by-pass connector wire located in front of right strut tower. Connect timing light to No. 1 spark plug wire. Check timing and adjust if necessary. See V6 IGNITION TIMING  table.
  3. Disconnect ground from EST by-pass circuit, and reconnect connector. Clear ECM trouble code.
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