What causes the glow plug to fail on a diesel engine?
What causes the glow plug to fail on a diesel engine? Common Causes of Glow Plug Failure. In warm and dry weather, the diesel engine will start even if one glow plug is defective and only the other plugs preheat. With glow plug failure there will usually be increased pollutant emission and possibly also knocking during start, however, the driver will not consciously take note of these signs,... When does the diesel engine pre glow light come on? What the diesel engine pre-glow light means Normally, the glow plug indicator light will come on only when the engine is cold....