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Q20
 How long will a spark plug last?
A
 Even when a spark plug is correctly used, periodic replacement is required as it is a consumable item.
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Examples of problems caused by excessively long periods of use:
Worn-out electrodes will have difficulty in sparking.
Deposits accumulated on the firing end may induce abnormal combustion (pre-ignition), causing problems that include melting of the electrodes.
Good Worn electrodes Fouled Deposits
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If the edges of electrodes are worn and rounded, sparks will not easily occur, which leads to engine starting problems and mis-firing during running: maximum power cannot be obtained form the engine.
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Power leaks through the carbon accumulated on the firing end, causing mis-firing as well as hindering engine starting.


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The deposits accumulated on the spark plug overheat and cause abnormal combustion (pre-ignition) that may lead to melting of the electrodes of the spark plug and engine damage.
These spark plugs require replacement.
It must be noted that these phenomena may also be caused by inadequate engine servicing (fuel systems and ignition system) and incorrect spark plug selection.
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