The function of glow plugs in a diesel engine is to preheat the combustion chamber to facilitate cold starting. Diesel engines rely on compression ignition, where air is compressed to a high degree, raising its temperature to a point where injected fuel will spontaneously ignite. However, during cold weather, the engine block absorbs heat from the compressed air, reducing the temperature and making it difficult for the fuel to ignite. Glow plugs are electri....
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