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Home >> Chevrolet >> 1990 >> APV >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> V6 Ignition Timing >> 2.8L (VIN R)

2.8L (VIN R)

  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. Disconnect Tan/Black wire EST by-pass connector located near heater housing in engine compartment on S/T Series, or near distributor on all other V6 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 SPECIFICATIONS  table. Reconnect EST by-pass connector and clear ECM trouble code.
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