On my 2001 EX, I have observed since new a problem whereby at 1500RPM, right about when the tranny is ready to shift, there is an low rumble or "diesel" sound (the kind of sound a diesel engine makes).
After finally getting around to taking it into Honda, the server rep. would like to replace the transmission, on warrantly of course.
I did a search of the boards and noticed references to a bad PCM and references to this problem.
Has anyone else had this problem, and has replacement of the transmission corrected it?