My sisters 1995 Ford Contour recently started stalling and acting up.
A shadetree mechanic told her it was the EGR Valve.
I cleaned her EGR valve + passages and checked the PCM for codes and
got just a code 327. Code 327 is apparently caused by too low of a
voltage signal at the DPFE sensor.
One quick question: If low voltage corresponds with a closed EGR
valve, and high voltage equals an open EGR valve, how can the valve
itself possibly cause a Code 327 and therefore too low of a voltage
signal?? In other words, how can an EGR valve be TOO far closed?? I
can understand a carboned-up EGR valve not seating all the way, but
wouldn't that result in the DPFE sensor seeing a voltage that is too
HIGH and not too LOW??
I'm just trying to figure out how I figure out whether the problem is
the DPFE sensor, or the EGR valve itself.
Does anyone have any recommendations on where to start?