The ignition of the air/fuel mixture before the preset ignition timing mark is termed as Pre-ignition. The mains reason of pre-ignition is due to the hot spots in the combustion chamber. Pre-ignition can also be caused amplified by low octane fuel, too high compression, insufficient engine cooling, lean air/fuel mixture, over advanced timing, or too hot spark plug. A change to a richer fuel mixture, a higher octane fuel, lower compression or a colder spark plug may bring the ignition in order. It is also recommended to check the cooling system of the car and also it might be required to retard ignition timing. Usually, pre-ignition leads to detonation. Please note that pre-ignition and detonation are two separate events.
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