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Answered 2007-11-15 23:41:54

Usually there will be a very loud rhytmic knocking sound coming from the block (entire engine) and sometimes through the exhaust in time with the rise of one piston. The engine will have an uneaven speed when cranking, but may or may not make noise until running. You will have a noticable loss of power and may have other complications if the piston is contacting the head or valves. Only a good mechanic can tell you whether you have a spun bearing, valve train problems, rod knock, broken rings, etc. so I would recommend that you have a reputable shop do a free inspection before jumping to conclusions. Good luck!

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