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The Air/Fuel mixture enters the cylinder, and at the moment the piston is close to top dead center, the spark plug fires creating a spark across the electrode. This spark ignites the mixture of Fuel & Air and forces the piston down. This downward motion is transformed into a rotating motion by the crankshaft which drives the vehicle through a transmission. The spark plug is basically a device that is used to ignite the fuel and cause an explosion within the cylinder. BTW, a diesel engine does not have a spark plug. The fuel/air is ignited by compressing the mixture to the point that it explodes.

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