M.B. DOC,
I hate to keep beating a dead horse, but I'm still curious as to "exactly" how the ECU would detect the following:

Keeping the EGR, it's wires and vacuum lines connected, attach a small air filter to EGR intake pipe, and block the exhaust from the down pipe. This would then allow the EGR valve to open and close letting in Fresh Air rather then exhaust into the intake manifold. Unless there are sensors which could detect the drop in temp or similar gas sensor to a O2 sensor it should work. I may be missing the obvious. I just hate the idea of clogging things up with this soot and goo.

Thanks