What is the function of the resistor in an NGK spark plug?

The function of the resistor in an NGK spark plug is to suppress ignition noise. This is particularly important in modern vehicles as it helps to minimize electromagnetic interference (EMI) that can affect the performance of various electronic components in the car, such as radios, navigation systems, and other sensitive electronic devices. The resistor effectively dampens the electrical noise generated when the spark plug fires, ensuring a smoother operation of both the engine and electronic systems.

The presence of the resistor allows for a cleaner signal and reduces the interference that could disrupt communications within the vehicle’s electronic systems, contributing to the overall reliability and performance of the engine.