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 MANUALSFORD1991CLUB WAGON E250, 7.3 MREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - DIESELGLOW PLUG SYSTEM DESCRIPTIONGLOW PLUG FAILURE ANALYSIS
1991 Ford Club Wagon E250, 7.3 M
Glow Plug Failure Analysis
1991 Ford Club Wagon E250, 7.3 MSECTION Glow Plug Failure Analysis
The following are examples of glow plug failure. Each example gives a different clue to glow plug failure analysis.
- There is no visible damage, but glow plug is electrically open See Fig 1. This indicates an internal heating element failure.
- Glow plug tip that is missing can be caused by incorrect timing or poor fuel quality See Fig 2.
- Multiple, distorted glow plugs are usually caused by electrical overheating See Fig 3. A complete evaluation of the glow plug control system should be made.
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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.