Spark Plug: Description and Operation

Spark plug wires carry high voltage pulses from the ignition coil to the spark plugs.

The spark plugs:
^ change high voltage pulses to spark at the gap which ignites the fuel and air mixture.
^ have a platinum-enhanced active electrode for long life. The active electrode is different for LH and RH sides.
^ have replacements with both electrodes platinum-enhanced so they can be used on either side.