[Diy_efi] Ford algorithym for opening the EGR valve

[David Cooley]

On fords I have seen where the rod that actuates the position sensor is too
long and you have to file 1/8" to 1/4" off before the EGR will work... 
 
-------Original Message-------
 
From: Joe Lopilato
Date: 11/04/04 19:21:29
To: 'A list for Do-It-Yourself EFI'
Subject: RE: [Diy_efi] Ford algorithym for opening the EGR valve
 
Hi:
 
Actually I replaced the solenoid valve with a new one becuase i thought that
the old one might not be opening. But the new solenoid is reacting exactly
the same way as the old one. I'm now wondering if the position sensor on top
of the EGR valve might not be sending the correct EGR valve position to the
PCM. Or one of the other sensors that the PCM uses to open the EGR valve is
not working. Any info would be appreciated.
 
Joe
-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Aaron
Sent: Thursday, November 04, 2004 7:06 PM
To: 'A list for Do-It-Yourself EFI'
Subject: RE: [Diy_efi] Ford algorithym for opening the EGR valve
 
 
Hello
I work in an automotive repair shop, and this is a common problem with these
 Actually they develop a surge more often. I cant help with the computer
part of it, but I can tell you to check the filter on the top of the egr
solenoid. They have something like scotchbrite there, clean it with carb.
Cleaner and use compressed air to blow it off.
Good luck
Aaron
 
 
-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
Behalf Of Joe Lopilato
Sent: Thursday, November 04, 2004 3:34 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] Ford algorithym for opening the EGR valve
 
Hi all:
 
I have a 1988 Ford F-150, 4X4, 5.0L. engine.
 
Does anyone have any info on what inputs are used by the PCM to decide to
open the EGR valve on this engine. I can't believe that the PCM opens the
valve relative to the engine rpm only. I am trying to debug a problem that I
have with an EGR that is not opening. I have performed all of the diagnostic
tests recommended by Ford and everything (EGR, EVP, EGR Solenoid) works in
static mode. But the valve does not open while driving the vehicle.
 
If anyone has any info on this or can lead me to a site that may shed some
light on this issue I would appreciate it.
 
Regards,
 
Joe 
 
 
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