Glow Plug

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 a Bad or Failing Glow Plug

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

Glow Plug 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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When replacing glow plugs, is that all that needs to be done? what is the glow relay?
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