Glow plugs are like mini heaters in your car’s bonnet. As heating elements, they warm the air and diesel in your engine for effective combustion. Glow plugs share the same functionality as spark plugs. But rather than sparking the ignition in petrol engines, they heat air and fuel to start diesel engines. Each diesel engine has a glow plug for every cylinder, which is why different makes and models need different numbers of plugs. Unlike spark plugs, glow plugs need to be warm enough under pressure to self-combust. In hot weather, fuel needs little assistance from other car parts to achieve this. However, diesel engines often struggle to ignite fuel in cold weather. The glow plugs heat the fuel in order for the engine to start. To start the engine, the intake air is compressed and, as the piston rises, the engine injects diesel into the combustion chamber. The injected fuel combines with the air, evaporates, and ignites. The ignition happens so quickly after evaporation that these processes are almost simultaneous.

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