no, its not the egr........its on the back side of the engine, by the firewall, on the drivers side. just above the back coil pack, on the drivers side.theres a bracket, that holds the fuel pressure regulator, theres a hose with a light blue,(i think) cap on it, and nestled in this bracket is a silverish box, and the tapping is REALLY loud when i listen there with the steth. dont know what it is, but it sure is making alot of racket. dont know what to ask for to replace it, or even look it up on the board..........hmmmmm

david