A spark plug is an essential component of any internal combustion engine since this is the part that provides the spark which ignites the fuel-air mixture inside. The most common use of a spark plug is in automobiles, but there are several other devices and engines that work on this concept and require a dedicated spark plug as well. Most of these machines cannot work without the ignition that the spark plug provides, and this is what makes the spark plug such an important aspect of these engines.

Faulty spark plugs can lead to severe problems in these machines, especially in automobiles. In the worst cases the engine will simply not start, and in milder cases, the engine will suffer from a loss of power and will also experience 'knocking'. Strange sounds will emanate from the engine when the mixture is being ignited and this could lead to many other problems as well. Hence it becomes very important for the owner of such a machine to recognize these issues as and when they arise, so that the efficiency of the engine does not suffer.

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