ok, another egr question. when i cleaned the egr last time, it was all clean.....bear with my description....the "piston" that is attached to the phillips headed rod moves freely up and down. if you look in there, there is a approx 3/4 cylinder that the rod moves up and down in. NOW, DOES THAT 3/4 CYLINDER MOVE UP AND DOWN TOO? or is that cylinder part of the casting. i was thinking the first time i cleaned the egr, it moved up and down too, and was nice and shiney, or did someone spike my ciggarette?? does my question make sense? i hope so cause its been a couple of weeks, and wondering about it has bugged me every day since. so question again, does the big cylinder move up and down, or just the phillips capped rod.

Thanks buds!!
david