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Home >> GMC >> 1997 >> Forward Control 6.5 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (Engine Controls - Adjustments - 5.0L) >> Ignition Timing
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Ignition Timing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1995 GMC Vandura, 1995 GMC Rally, 1995 GMC Pickup, 1995 Chevrolet Sportvan, and 1995 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Set parking brake. Block drive wheels. Place transmission in Neutral or Park. Warm engine to operating temperature. Turn A/C off (if equipped). Ensure Malfunction Indicator Light (MIL) is not on.
  2. Disconnect Tan/Black Electronic Spark Timing (EST) by-pass connector wire located near distributor or in cab under glove box. 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. Clear DTC.
IGNITION TIMING (DEGREES BTDC @ RPM)

Application Man. Trans. Auto. Trans.
5.0L (VIN H) 0 @ Idle 0 @ Idle
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