Sorry for the late reply Vic, but no I have not identified the source of my noise yet. Your description of your noise fits mine though as well. Also, my noise appears to be continuous while the engine is running. When I pull up in a drive thru with the window down, I can hear the sound bouncing off of the building who's drive thru I am in. It does not increase in volume or speed when RPM's rise.

Any more news with your noise? Does anyone else have any ideas?

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1999 ML430
2003 Chevy Suburban Z71
1993 Honda Prelude V-Tech