[Shotimes] Re: Semi-OT: EGR Predicament, Part 2

[Steve Weinrich]

About the only test that I can think of still to be done is to insert a
vacuum guage into the sample lines.

When the EGR valve opens one of the lines will show a vacuum of up to
several inches while the other line remains constant.  This is the
"Differential" that the pressure feedback sensor is looking for.

Of course, removing the lines will probably destroy them, so pick up some
cheap line to use temporarily untill you can find some higher temp stuff.

Question for you.  During the KOER test, does the engine RPM ever drop by
several 100 RPMs as part of the sequence?  I recall on my 94 that with the
bad DPFE it would do just that, then give the 332 error at the end.  With
the new DPFE installed, the drop in RPMs was almost imperceptible.  If there
is no drop in RPMs and you still get the 332 error, there may be a fault in
the vacuum valve that switches the EGR valve.  You can put the vacuum guage
in the vacuum control line and see if you're getting vacuum during the KOER
test.

Steve

----- Original Message -----
From: "Joseph van Oss" <vanOss@centurytel.net>
To: <shotimes@autox.team.net>
Cc: "TechSHO" <TechSHO@topica.com>
Sent: Monday, November 11, 2002 11:06 PM
Subject: Semi-OT: EGR Predicament, Part 2


> (OT)  This is about my wife's 1994 Crown Vic with SOHC 4.6L.  It's been
giving codes 332 and 337, which both point to EGR.  I have
> tried these steps:
>
> 1. Remove and clean out the EGR tube and passages.  Didn't seem too bad.
The EGR valve itself seemed to move okay with vacuum
> applied (my mouth on a piece of tubing).  Cleared codes, got 'em right
back again.
>
> 2. Tested electrical behavior of the EGR Feedback Sensor (DPFE, part
#FOTZ-9J459-A).  Seemed to indicate a fault. Replaced the
> sensor.  Cleared codes, got 'em right back again.
>
> The EGR metal tube looked perfectly healthy.  At this point, I think the
only potentially faulty parts of the EGR system not yet
> replaced are the EGR valve itself, and the hi-temp pressure lines to the
sensor.
>
> As I've said, the EGR valve appeared to operate normally, although I did
have to inhale ;-) what seemed a bit hard.  Maybe I should
> R/R the EGR valve?  In the process I could pull out the pressure
(sampling) lines and test them, I suppose.
>
> Any other tips or suggestions?
>
> Joseph
>
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