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Glow plug relay

The glow plug relay controls the preheating of the glow plugs in a diesel car. Diesel ignites under high pressure when it comes into contact with oxygen. This does not require a spark, like a petrol engine does. However, the fuel must be gaseous for this, and this is where the glow plug comes in. By heating up the fuel, the car can start reliably, even on a cold day. The glow plug is heated by the glow plug relay. In early diesel engines, this preheating could take a long time, nowadays, it only takes a few seconds.

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