2007 Ford Taurus 3.0 Vulcan
My car has the P0174 code. I performed a smoke test to look for vacuum leaks. My EGR valve has smoke emitting from the small vent holes. My understanding is that my EGR valve’s diaphragm is damaged. Is this a correct assumption? Thank you in advance.
Most likely. A simple vacuum test will verify it. For that just stick a vacuum line on it and apply vacuum and then block the line and see if it holds.