[Shotimes] DPFE and PFE sensors

[Carl Prochilo]

Yes Alan, Thank you for sending that memo.  I would say anyone that
has an EGR on their cars would benefit from that knowledge.

I tried to reply to your-e-mail but Earthlink and other ISPs are
blocking my personal mail account.

George, were you able to determine why your EGR system failed?
-- 
Cheers,
Carl Prochilo
1992 Ultra Red Crimson

George Fourchy said:
> On Wed, 21 Apr 2004 10:00:53 -0700, George Fourchy wrote:
>
>>The problem was definitely that (D)PFE* sensor and the connector.
>
> OK...thanks to Alan Fanning, here's the scoop....
>
> Lowrider has a PFE sensor.  Later model cars (not necessarily
> SHOs....I have no
> knowledge here) have DPFE sensors, if they have EGR.
>
> PFE sensors have ONE tube going to the EGR system.  DPFE sensors
> have two, since
> the D means differential, as in comparing one pressure source to
> another.  The PFE
> sensor just measures the presence of exhaust gas pressure in the EGR
> system, while
> the DPFE measures the upstream (exhaust side of EGR passage)
> pressure vs the
> downstream (intake side) pressure.  It should measure equal
> pressures with the EGR
> closed.  There is more exact monitoring of the valve's position with
> a differential
> sensor, so its potential failures, both opening and closing, can be
> more accurately
> determined.
>
> George
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