Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1986G 20 VAN V8-379 6.2L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTGLOW PLUG SYSTEMGLOW PLUGTESTING AND INSPECTION
1986 Chevrolet G 20 Van V8-379 6.2L DSL
Glow Plug: Testing and Inspection
1986 Chevrolet G 20 Van V8-379 6.2L DSLSECTION Testing and Inspection
Glow Plug System Wiring Schematic:
Glow Plug System Diagnosis (Part 1 of 3):
Glow Plug System Diagnosis (Part 2 of 3):
Glow Plug System Diagnosis (Part 3 of 3):
CAUTION: The glow plug relays are automatically controlled. Do not attempt to bypass the relay terminals of the controller as the glow plugs will be damaged.
1. Inspect all system electrical connectors and ensure terminals are free from corrosion and that connectors are fully seated.
2. Inspect engine harness ground stud, ensuring wire end terminals are free from corrosion and that stud nut is properly tightened.
3. Inspect relay terminal lugs on controller, ensuring wire end terminals are free from corrosion and that nut are torqued to 3.9-5.1 Nm (35-45 in lbs).
4. If glow plugs function normally but glow plug lamp fails to light, inspect connections and bulb in instrument panel jumper harness and repair as needed.
5. If system fails to operate properly refer to wiring schematic and diagnostic charts.
RENDER: 1.0x
NO RELATED
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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.