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Engine knock, also known as detonation or pinging, is a knocking noise that you'll hear when the fuel in the cylinders detonates in more than once place at a time. This usually happens when the air-fuel mixture in the cylinder is detonating in more than one place at a time, instead of the normal one-point ignition.
It's often a sign that the engine is not operating efficiently and can cause damage if it's not corrected. This can be caused by several factors such as using low-octane fuel, wrong spark plug gap or incorrect ignition timing.