1983 GMC Forward Control 5.7 M, StandardFACTORY OEM SERVICE PROCEDURE

Engine Will Not Start

NOTE: If engine is difficult to start or misses, check position of battery terminal connector at distributor cap. Terminal must be inserted on side of connector opposite hold-down clip.
  1. Connect voltmeter between battery terminal lead on distributor connector and ground. Turn ignition switch on. If voltage is zero, check system for open circuit.
  2. If reading is battery voltage, connect a modified spark plug (plug that has ground electrode cut off) to center brush contact in distributor cap.
  3. Crank engine. If spark occurs, trouble is not in ignition system. Check fuel system, spark plugs and wires for trouble. If sparking does not occur, follow procedures under System Testing or Component Testing. See Fig 1.
Fig 1: Modifying Spark Plug for Testing A commercial spark tester may also be used.
G9008
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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