EGR problem please help
Posting Guru
Joined: Jan 2001
Posts: 2,358
Likes: 3
From: Nebraska
Very interesing topic guys. Let me add this. What about the EVP sensor? Even if the computer had no other way of knowing the EGR wasn't operating, this sensor gives it away. The computer tells the EGR to open, expecting this sensor to tell it that it opened. If the sensor is saying nothing's happening, you'll throw a code. I'm guessing it would be "insufficient flow".
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
Originally posted by brown 4x4
Very interesing topic guys. Let me add this. What about the EVP sensor? Even if the computer had no other way of knowing the EGR wasn't operating, this sensor gives it away. The computer tells the EGR to open, expecting this sensor to tell it that it opened. If the sensor is saying nothing's happening, you'll throw a code. I'm guessing it would be "insufficient flow".
Very interesing topic guys. Let me add this. What about the EVP sensor? Even if the computer had no other way of knowing the EGR wasn't operating, this sensor gives it away. The computer tells the EGR to open, expecting this sensor to tell it that it opened. If the sensor is saying nothing's happening, you'll throw a code. I'm guessing it would be "insufficient flow".
if the EVP does not indicate the EGR has moved then there are a couple codes it can select....the insufficient flow has at least 2 causes in the step guide....one of the more sublte one being an unexpected O2S and MAP reading - and if Im not mistaken, the ECM (in at least OBD2) will choggle the EGR a little to look for a change before it gripes - I am not sure if EECIV does the same
Senior User
Joined: Dec 2003
Posts: 404
Likes: 0
From: Groton, CT
OK, this topic has gotten really old.
If you want to remove your EGR, have a ball.
You are absolutely right...
and 2000 automotive design engineers are wrong...
My humblest apologies.
There, now shall we find something else to talk about.
Thanks.
(P.S. spellcheck is a wonderful tool, try it, you'll like it)
Have a nice day.
If you want to remove your EGR, have a ball.
You are absolutely right...
and 2000 automotive design engineers are wrong...
My humblest apologies.
There, now shall we find something else to talk about.
Thanks.
(P.S. spellcheck is a wonderful tool, try it, you'll like it)
Have a nice day.
Mountain Pass
Joined: Jun 2003
Posts: 203
Likes: 0
From: Killeen Texas
the evp gives codes regarding incorrect voltages, egr not opening, and circuit failure when the egr valve does not operate or the evp is screwed up. the evp only gives information on the exhaust valve positon, which is the egr. I beleive that on trucks from 87-91 there is only the evp and no flow sensor. On trucks 92 and later, i believe that they include a flow sensor.
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