The spark plug is essentially a device that generates an electric spark to ignite the compressed air-fuel mixture inside the engine cylinder. This ignition process creates a small explosion, which pushes the piston down and ultimately drives the vehicle forward. Without spark plugs, the engine would not be able to start or run efficiently.

Developments and issues

This tough, chemically inert polymer has a wide working scope as well as: 

Oil seal: get to know all the details about this timing chain kit component