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A glow plug problem can be spotted by the vehicle having trouble starting the engine. The indicator light in the for a glow plug can indicate a bad disconnected or corroded glow plug, or even a bad temperature sensor. If when you first start the engine there is a misfiring until the engine warms up, it is a good chance a glow plug problem. Usually misfiring will cease after the engine has been running about ten minutes. One of the last systems of a bad glow plug is you see white exhaust when starting the engine. Diesel is let into the combustion chamber to start the engine. A bad or even disconnected glow plug will allow diesel to leak from the chamber into the exhaust. The fuel is then ignited in the exhaust pipe and produces a white smoke. Once the engine again warms up the white smoke will stop.

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Q: What are symptoms of glow plug problem?
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