What is the primary function of a spark plug?

The primary function of a spark plug is to ignite the air-fuel mixture in the combustion chamber. This ignition is essential for the operation of gasoline engines, as it initiates the combustion process that creates the power needed to drive the engine. When the engine's ignition system sends a high-voltage electrical charge to the spark plug, it creates a spark that ignites the compressed air-fuel mixture, leading to an explosion that pushes the piston down, generating power.

Understanding the role of the spark plug is crucial for automotive technicians, as faulty spark plugs can lead to misfires, reduced engine performance, and increased emissions. Proper maintenance and timely replacement of spark plugs are important to ensure optimal engine operation.