When the spark plug ignites the mixture and a sharp pressure spike occurs after that, it is auto-ignition. That's what you hear. With pre-ignition, the ignition of the charge happens far ahead of the spark plug firing, Fuel should burn in even waves that are timed to the engine's cycles, carrying through until the next cycle causes the next wave. When fuel is improperly ignited, it causes a fireball-like explosion that can interfere with the engine's cycles and can even damage engine components
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