Ford Explorer: Autozone Scanners

Donald H. Shelton wrote: 


Haynes manual has some tests you can do to determine whether it is the
ERG valve or a sensor. Try that and replace what those tests indicate.

The DPFE is a more common failure than the EGR valve. We would need to know
what code was set to recommend a diagnostic procedure.


--
Jim Warman
net

"Donald H. Shelton" <net> wrote in message
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to 

The code P0402--Excessive EGR Flow

Don


"Jim Warman" <net> wrote in message
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Eight times out of ten, that one comes up as bad DPFE..... There is a real
easy way to test the DPFE but it does require a scanner capable of
displaying PIDs (parameter indication data). A digital multimeter can be
used but there's too much chance of damaging the connector when
back-probing.

DPFEs aren't terribly spendy.... since they are a know area of concern, I'd
seriously consider slam dunking a sensor on, clearing codes and trying it.
The usual precautions apply... check the hoses and electrical connections,
use a vacuum guage (a real one, not the tip of your finger) to be sure that
the EVRV isn't leaking. From the factory, the hoses would be silicon
rubber - regular rubber will suffice as a temporary substitute if they need
replacing and no suitable hose is available locally. When removing the
hoses, work gently. Though the silicon rubber can withstand amazing amounts
of heat, it can be mechanically damaged very easily.


--
Jim Warman
net

"Donald H. Shelton" <net> wrote in message
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Interesting. I work with digital controllers, and I know PID as meaning
Proportional Integral Derivative, a method of calculating an output given an
input. Are we referring to the same thing?

- mike

"Jim Warman" <net> wrote in message
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No..... in the automotive sense, a PID would be a data stream reading. It
may be something as simple as an on/off signal regarding an input or an
output or it may be a little more complex such as a sensor voltage reading
or even the same voltage reading converted to it's inferred value (throttle
opening in percent or temperature seen by a sensor, for example).

When it comes to Ford, we are faced with a barrage of acronyms. Our two
industries are faced with different terminology with the only commonality
being the first letters of a particular item or function.


--
Jim Warman
net

"mike w" <mchsi.com> wrote in message
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an 

FWIW, I also got a scanner code for "Insufficient EGR", pointing to possibly
bad DPFE. This is in our '96 Explorer (4L 6 cyl) a couple years ago.

I back-probed the DPFE, used a couple small nails (brads) by pushing them
into the connector until they touched the metal tabs. I didn't have to
pierce the insulation (although that's another way to do it). Used
multimeter probes with the small alligator clips on the ends (instead of the
touch probes). You can get these as Radio Slack. From there, it was easy
to diagnose.

Bottom line, per the Haynes description, my DPFE was in fact bad. Replaced
it and reset the computer with the scanner. Have not see the Check Engine
light since.

Verified it really was the DPFE by drilling out the rivets and taking the
thing apart. The flow sensor chambers were all gummed up with what looked
like large grains of pepper, probably a half teaspoon of gunk in all. No
wonder it wouldn't work (thus throwing off the EGR balance).

Backprobing should work fine.

Mike

"mike w" <mchsi.com> wrote in message
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real