I didn't see my previous reply to my EGR and emission's test show up in the forum, so I am sending again.
Thanks for the previous info., Phil.
I took it all apart again this morning. To me, it doesn't look like the massive clogging I expected if the EGR were the source of my NOx emission error. If any experts could please look at the digital snaps I took and give me an opinion, I would appreciate it. Here is the link. There are three pictures on this page that are about 60K each. They pop up at once, so please wait about 20 seconds for them to download if you are on dial-up.
I did really soak and drain the EGR chamber a few times with throttle-body cleaner. I don't know if it helped but it didn't seem like I felt any clogs "around the bend" in the chamber.
The port on the TB was not clogged any more than the other three ports shown in the pictures (I could not get the camera in position for a decent shot). It looked clear as far as I could see and feel. I shot TB cleaner in it and it did not backflow/ fill up.
My spark plugs have 63k on them. The car idles fairly smoothly and accelerates just fine. Old plugs wouldn't really affect NOx that much, would they?
The EGR modulator seemed to function as the book said it should when blowing air through it. I used compressed air to blow out the filter material.
Unless I unclogged things with the TB cleaning fluid, I don't think anything has been solved and hate to waste my 1 free re-inspection. Any thoughts would be appreciated.
Thanks in advance, Doug