What function in a diesel engine does a glow plug perform?

Explanation

Correct answer: It makes the start of a cold engine easier.

A glow plug is a heating element whose purpose is to pre-heat the air in the combustion chamber. In a diesel engine, ignition occurs automatically due to the high temperature of the compressed air; however, when the engine is cold, this temperature may be insufficient. The additional heat provided by the glow plug enables effective ignition of the mixture and facilitates starting the engine in low temperatures.

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