I believe if the problem you are suggesting is a slight tapping noise that increases with engine RPM's, I believe I have it as well. Almost sounds like a playing card in between bicycle tire spokes, but a little more subtle? I have been told by 3 stealerships that its absolutely normal, and that its the loud injectors on this engine. Have you noticed that it doesnt happen until oil temps reach around 180-220? The only time I hear it is under normal to above average operating temps. Also, I can hear it more under load, especially if I drive by an acoustic enhancing object like a wall, drive thru or carport.
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