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Knock in Toyota sienna engine

Hi

I have a Sienna 2006, recently, I heard a Knock in the engine. The issue is this knock come once a week or some times twice a week

and then its gone

kindly, any suggestion...

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Knocks come in many shapes and sizes . it could be anything from a rod knock when under load to a knock made from not enough octane in the fuel . Could also be carbon build up in the cylinder head. Does the knock come at a regular time , for eg when your accelerating or under heavy load ,when you let of the throttle. does the knock come with a backfire at all. What conditions are you hearing the knock

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