2002 Audi TT Quattro ALMS Edition 4 Cyl 1.8L
what is spark plug gap?
Spark plug gap refers to the distance between the electrodes (center and ground) of the spark plug. The center electrode runs down through the middle of the spark plug and acts as a conductor for the high-voltage signal. The spark gap is necessary to create the spark - as the high voltage 'jumps' the gap - to ignite the air / fuel mixture inside the engine cylinder.