EGR Valve Question
Posting Guru
Joined: Oct 2004
Posts: 1,016
Likes: 0
From: Lynden, WA.
Originally Posted by Debug
The EGR valve only opens when the exhaust pressure is greater than the intake pressure.
I did type that basackwards didn't I?
OK Here's the correct definition:
The EGR valve introduces exhaust gases into the intake manifold at cruising speeds to lower the combustion temperatures, which reduces oxides of nitrogen (NOx) emisions. Exhaust gases pass through a cooler to reduce their temperature before reaching the EGR valve. The only way the exhaust gases can flow into the intake is if the exhaust backpressure is higher than intake manifold pressure, so the computer adjusts the VGT to provide the necessary backpressure when EGR flow is needed.
Post Fiend
Joined: Apr 2004
Posts: 19,098
Likes: 8
From: Great State of Texas
I have resisted thus far but can't stand it no more. Resisted 'cause I am not a scientist, engineer, or any of that Einstein stuff.
Seems to an 'ol country boy though, that the rapid reduction of exhaust gas temps can result in it's own negative issues. Possibly creating particulate matter that may have been disintegrated (or even non existent) at the higher gas temps. And how 'bout condensation?
Condensation, carbon, and particulate matter now forming a hell of a mess causing the EGR valve to load up and stick open...now throwing chunks of our new mess at the turbo...causing yet another serious issue.
A classic cascade effect.
No scientific basis of fact...just my wild imagination working overtime.
Seems to an 'ol country boy though, that the rapid reduction of exhaust gas temps can result in it's own negative issues. Possibly creating particulate matter that may have been disintegrated (or even non existent) at the higher gas temps. And how 'bout condensation?
Condensation, carbon, and particulate matter now forming a hell of a mess causing the EGR valve to load up and stick open...now throwing chunks of our new mess at the turbo...causing yet another serious issue.
A classic cascade effect.
No scientific basis of fact...just my wild imagination working overtime.
Tuned
Joined: Sep 2001
Posts: 340
Likes: 1
From: Texas
I have run my truck for quite sometime with the EGR disconnected but recently decided I wanted to see what it was like with it plugged up again. I ran a couple of controlled tests with it plugged in and unplugged and noticed that the truck felt and sounded like it had noticeably more boost WITH the EGR plugged in. If you are running yours unplugged I challenge you to give it a go unplugged and romp it a few times then try it plugged in.
Post Fiend
Joined: Apr 2004
Posts: 19,098
Likes: 8
From: Great State of Texas
Many here report lower boost pressure. I for one have never disputed that or even cared, for that matter, since a Programmer accidently appeared at about the same time my EGR valve fell off.
My sole purpose for WART removal is for the benefit of a cleaner system and to not subject engine to a self induced trashing.
Why
Add
Regurgitated
Trash
My sole purpose for WART removal is for the benefit of a cleaner system and to not subject engine to a self induced trashing.
Why
Add
Regurgitated
Trash
Post Fiend
Joined: Apr 2004
Posts: 19,098
Likes: 8
From: Great State of Texas
No risk. You don't sound like a jerk. It's a very good question.
The programmer has nothing to do with introducing trash into the system. Actually, indirectly may help reduce trash.
I am not concerned that the Predator will do damage for a few reasons:
#1...It has never been off 65 H.P...ever...not even once. If a 15% H.P increase will hurt this engine, the after market exhaust and Intake systems are gonna start causing a lot of problems.
#2...I am not abusive. If you use anything to excess bad things will likely happen.
#3...Even when I do "get on it" it is only for a few seconds...never even gets lathered up.
#4...Of the few blown 6.0 engines I have read about, none had the Predator installed. The other programmers have typically been involved along with other mods.
#5...The WART / Programmer issues are not at all related. Therefore, not in conflict with each other.
#6...I would never contradict myself. And if by some freak accident of nature I did, I would contrive justifications that would ratify my contradicting statements to such an extent that most participating members of the human species would become so immersed in irrelevant facts that they would have no proclivity but to...well...bow to the purity of my majesty.
Any other questions Duke?
The programmer has nothing to do with introducing trash into the system. Actually, indirectly may help reduce trash.
I am not concerned that the Predator will do damage for a few reasons:
#1...It has never been off 65 H.P...ever...not even once. If a 15% H.P increase will hurt this engine, the after market exhaust and Intake systems are gonna start causing a lot of problems.
#2...I am not abusive. If you use anything to excess bad things will likely happen.
#3...Even when I do "get on it" it is only for a few seconds...never even gets lathered up.
#4...Of the few blown 6.0 engines I have read about, none had the Predator installed. The other programmers have typically been involved along with other mods.
#5...The WART / Programmer issues are not at all related. Therefore, not in conflict with each other.
#6...I would never contradict myself. And if by some freak accident of nature I did, I would contrive justifications that would ratify my contradicting statements to such an extent that most participating members of the human species would become so immersed in irrelevant facts that they would have no proclivity but to...well...bow to the purity of my majesty.
Any other questions Duke?
Tuned
Joined: Sep 2001
Posts: 340
Likes: 1
From: Texas
All very good points except #6. I have read on other threads that suggest the EGR does not close fully at shutdown. Have you ever removed your EGR to see if it is indeed closed all the way? I am curious enough about it that I am contemplating removing mine to see if it is closed and how much trash is built up on it.
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Post Fiend
Joined: Apr 2004
Posts: 19,098
Likes: 8
From: Great State of Texas
Keep in mind that my wart fell off at a very early age. Had it not closed all the way I certainly would have developed drive-ability issues by now, 1+ year & almost 15,000 miles later.
I have always used fuel additive, which (IMO) allows for a cleaner, more efficient fuel burn. The chances of the wart not closing all the way due to carbon deposits were significantly minimized from the beginning.
In addition, I would suspect that those who have experienced incomplete valve closure, when attempting the disconnect strategy, were already experiencing difficulties and basically coming to the dance after the music has stopped playing.
I have no intention of physically removing the valve as I feel secure in the fact that it is closed. Secondly, it is my understanding that it is not a simple task to remove or re-install. I believe Ford has a special tool provides some emotional relief, though.
I have always used fuel additive, which (IMO) allows for a cleaner, more efficient fuel burn. The chances of the wart not closing all the way due to carbon deposits were significantly minimized from the beginning.
In addition, I would suspect that those who have experienced incomplete valve closure, when attempting the disconnect strategy, were already experiencing difficulties and basically coming to the dance after the music has stopped playing.
I have no intention of physically removing the valve as I feel secure in the fact that it is closed. Secondly, it is my understanding that it is not a simple task to remove or re-install. I believe Ford has a special tool provides some emotional relief, though.
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