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Answered 2008-05-07 19:03:58

Knocking sounds like someone repeatedly rapping the engine with a hammer, and the quieter pinging resembles marbles being shaken inside a tin can. Knocking and pinging are actually symptoms of abnormal combustion in an engine, mostly heard when it is under heavier load, during acceleration as opposed to cruising. What causes abnormal combustion? Many things, some of them avoidable and some of them not, but the common solution to almost all of them is gasoline with a higher octane rating

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