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Have you had trouble starting your diesel car in the recent cold weather? If so you may have one or more failed glow plugs. What are glow plugs? Glow plugs are electrical heating devices that are installed in the combustion chamber of each cylinder of a diesel engine. They are used to preheat the air in the cylinders so that the fuel will ignite more easily. This is especially important in cold weather or at high altitudes where the air is thinner and the fuel will not ignite as easily …