I see.... in your case you DON'T have a conventional EGR valve then. You
have a digital or linear EGR valve that is electrically controlled by the
ECM...they don't have diaphragms. In either case, digital or linear, you
need a scan tool to check the valve. You should not try cleaning these types
of EGR with any solvents, etc. You can test the pintle by depressing it with
something soft (ie a piece of wood with some cloth on the end). If the
pintle is sticky or moves roughly it probably needs replaced, but they
aren't cheap so you would want to be sure that, that's the problem before
purchasing another one unless of course the auto store has a good return
policy as in....if it doesn't fix the problem, return the part ;) Anyway....
if you go to http://advanceautoparts.com/ and add your vehicle, then do a
search for EGR, you'll get an idea of what your valve looks like.....