NGK Spark Plugs
The basic spark plug has undergone a number of changes over recent years to accommodate the demanding operating conditions required by modern engines. Changes in Spark plugs have been caused by demands for longer life and also improved ignitability in today's lean burning modern engines.
It is critical that each cylinder fires to prevent unburnt fuel from reaching the catalytic converter and causing damage. With engine manufacturers striving to improve fuel consumption, the possibility of misfire becomes a problem.