LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1987 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - V8 >> Adjustments >> Ignition Timing >> Carbureted Engine
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Carbureted Engine

  1. Connect an adapter between No. 1 spark plug wire or use an inductive pick-up. Do not puncture wires. Connect timing light according to manufacturer's instructions.
  2. Check or adjust ignition timing with engine at normal operating temperature, and distributor vacuum line disconnected and plugged. Place automatic transmission in Park and manual transmission in Neutral.
scientia non olet · About LEMON Manuals