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Glow Plug

Auto Systems and Repair

The glow plug is an electrically heated, thin metal probe that warms the air and Diesel fuel mixture in the combustion chambers. This helps in the initial start-up of a cold Diesel engine.

Symptoms of Wear or Failure

  • Illumination of the Check Engine Light
  • Hard starting when the engine is cold

Related Repair Advice

  • For best results and to avoid future problems, replace the glow plugs as a complete set. Be sure to verify that the glow plug relay is operating properly.
  • If the glow plug relay, injector pump timing, and engine compression are not properly checked, then replacing the glow plugs may not address the initial problem

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