1996 GMC Forward Control 4.3 Z, AutomaticFACTORY OEM SERVICE PROCEDURE

Engine Will Not Start

SYMPTOM - ENGINE WILL NOT START

Possible Cause Correction
No voltage to fuel shut-off solenoid Check electrical connections
Restricted air filter Check and/or replace air filter
Faulty glow plugs, relay or PCM Check and/or replace glow plugs or controls
Plugged fuel return system Remove restrictions
No fuel to nozzles Inspect fuel delivery system
No fuel to injection pump Inspect fuel delivery system
Clogged fuel tank filter Replace filter; see SYSTEM/COMPONENT TESTS article
Incorrect or contaminated fuel Remove and replace fuel
Restriction in turbocharger inlet duct (if equipped) Remove restrictions
Incorrect pump timing See TESTS W/CODES article
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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