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Depends on the type of knock. Rod or main bearing knocking is most likely excessively worn bearings, or a loss of oil pressure. "Pinging" is caused by over-advanced ignition timing, carbon buildup in the combustion chamber, spark plugs with a heat range that is too high, fuel with an octane rating that is too low, or an overheated engine. Hard to be more specific than that without any more information.

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12y ago

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