I must be the 'People" but yes the metallic tubes covering the EGR pipes will rattle at various RPM's ( mine happened above 3k rpm's when hot under acceleration, It must have been just enough vibration to make this sound) I spent months and many trips to the dealer only to be told my "Rattle" was normal and they could not find anything wrong with my Jeep! I knew something was making this noise and upon tapping on everything and moving things around I found these coverings were not clamped down and if they are loose you could flick them with your finger and they would make a metallic sound. I clamped them and NO MORE NOISE!
There are 2 pipes and the one that runs straight down the back of the engine and firewall was the culprit, it sounds like it comes from the transmission or bell housing housing area or possible bad catalytic converter. after messing around with it for a while before clamping it I tried pinching it tighter and the sound just got different but after clamping it, it was gone.
Last edited by PmedicJ; 03-27-2011 at 08:41 AM.