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my 2001 Nissan Pathfinder started giving a dreadful tapping sound like metal knocking on moving part in the engine. I asked my mechanic to open it up. Only to discover that the fuel control valve on top of the engine has dropped straight into the combustion chamber. I need expert advice on what to do because, I'm afraid if the cylinder head is opened it might shorten the life span of the engine (LE 3.5). PLEASE HELPPPPPP