Maybe a screw was dropped somewhere? Licence Plate could rattle! A barrel nut that has come undone can shake up inside a valve cover! The boxed tin located just above each oil return line under the engine sometimes get flimsy! I'd get a long screwdriver and poke at them while the engine runs! I'm not really sure what they are for though. I guess they help in guiding air between the cylinders. Get a long rubber hose and try scoping that noise out.
Last edited by madkow; 01-08-2007 at 08:25 PM..