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Extremely weird sound

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I started up my 04 450 and its started clattering and as some as I reved it it stopped,what could it be?

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More info needed. Does the sound come back when the idle drops again? Post a video if you want help, otherwise you will just get guesses.

Edited by nzgsr

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How many hours on the piston? I had an 04 that did this exact same thing and about 20 minutes later it spit the piston out the side of the cylinder. Piston skirt gets worn and allows the piston to "slap" the cylinder

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What about if you pull the clutch in? Does it stop then? Take a short piece of garden hose and go around the engine with the hose up to your ear. This will work like a doctors stethoscope and help you zero in on the location of your noise

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