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Illustrated: Typical Spark Plug
Illustrated: Typical Spark Plug
Spark Plugs: Correct spark plug choice and maintenance is essential for the optimum running of your engine. Diagnosis of the appearance of a spark plug is an effective method of evaluating how the engine is functioning and what improvements can be made.

It is important to use the spark plug type recommended for your vehicle. Those dimensions have been tested and approved for that model. A plug of different dimensions may cause harm to the engine.
A spark plug is part of the ignition system of an internal combustion engine and must perform two primary functions:

» Ignite the air/fuel mixture,
» Remove the heat from the Combustion Chamber.

Other components of the ignition system include the distributor (or computer) and ignition coil.

Spark Plug Function:
» Battery sends low voltage to Ignition Coil
» Ignition Coil transforms current to high voltage
» Distributor or Computer distributes voltage to each spark plug in turn
» Spark Plug generates a spark between gap of ground and centre electrode
» Compressed fuel/air mixture ignites & explodes creating working energy
» Important factors are the timing of the spark, the correct heat range and the correct spark plug gap.
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