EGR Disconnect Instructions
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Former Vendor
Joined: Mar 2004
Posts: 4,362
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From: Hendersonville, NC
When I get my truck back, I am going to run a set of my own tests on this EGR issue. I feel between the terrain of this area and the way I drive should really be able to extract some decent data once i get my gauges installed.
Ill make runs for boost and EGT with the EGR hooked and unhooked. Im not sure if tailpipe emissions can be measured on a diesel, but my uncle runs a shop that does state inspections, and if it is possible, i will have him check and see if a significant difference in emissions is present, for all you cali boys
Ill make runs for boost and EGT with the EGR hooked and unhooked. Im not sure if tailpipe emissions can be measured on a diesel, but my uncle runs a shop that does state inspections, and if it is possible, i will have him check and see if a significant difference in emissions is present, for all you cali boys
Senior User
Joined: Dec 2003
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From: tampa florida
I unplugged mine and the truck seems to come off of the line faster less turbo lag,the one thing I noticed is,it has less smoke on start up and less smoke on heavy acceleration.fuel mileage is about the same though so far.
Posting Guru
Joined: May 2004
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From: stoneboro, pa
Originally Posted by derek witt
I am going to unplug EGR as well but am a little confused regarding noise level. In many previous threads I have read that people feel that there truck may be a little louder after unplugging EGR, now in a couple of responses here, guys feel it may be a touch quiter. Is there any mechanical reason why it may be quiter/noisier ? Can anyone confirm their noise level ?
Also, by having the EGR unplugged, will the truck take longer to warm up? (important here in our cold winters) Thanks for any responses.
Also, by having the EGR unplugged, will the truck take longer to warm up? (important here in our cold winters) Thanks for any responses.
Normal EGR Valve Operation--Open at Idle:
Trucks built after 9-30-03 and those truck reprogrammed with WDS version 27.9 or higher will now have the EGR valve open at idle. This is to reduce engine noise at idle that has occured from removing the pilot injection. When diagnosing the EGR valve it is normal for the valve position value (EGRVP) to not change until the EGR duty cycle is greater than 30%. Broadcast Message 1067
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Former Vendor
Joined: Mar 2004
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From: Hendersonville, NC
Originally Posted by ninelives 59
I unplugged mine and the truck seems to come off of the line faster less turbo lag,the one thing I noticed is,it has less smoke on start up and less smoke on heavy acceleration.fuel mileage is about the same though so far.
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Former Vendor
Joined: Mar 2004
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From: Hendersonville, NC
Originally Posted by bighoss550
this is a excerpt from "dieselmans" ford bulletin page:
Normal EGR Valve Operation--Open at Idle:
Trucks built after 9-30-03 and those truck reprogrammed with WDS version 27.9 or higher will now have the EGR valve open at idle. This is to reduce engine noise at idle that has occured from removing the pilot injection. When diagnosing the EGR valve it is normal for the valve position value (EGRVP) to not change until the EGR duty cycle is greater than 30%. Broadcast Message 1067
Normal EGR Valve Operation--Open at Idle:
Trucks built after 9-30-03 and those truck reprogrammed with WDS version 27.9 or higher will now have the EGR valve open at idle. This is to reduce engine noise at idle that has occured from removing the pilot injection. When diagnosing the EGR valve it is normal for the valve position value (EGRVP) to not change until the EGR duty cycle is greater than 30%. Broadcast Message 1067
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From: stoneboro, pa
Originally Posted by PSD 60L Fx4
Interesting peice of information. Might explain why some claim it makes thier motor louder, and some the opposite. No explanation for the opposite but I may be overlooking something. Mine did'nt seem to change at all.
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Former Vendor
Joined: Mar 2004
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From: Hendersonville, NC
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Posting Guru
Joined: May 2004
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From: stoneboro, pa
BTW, i checked this out today and (by ear) it definately is louder w/ it unplugged. a lot louder at idle. no noticable difference any where else.
although this may be in the calibration difference in my 550 as compared to the 250's and 350's
although this may be in the calibration difference in my 550 as compared to the 250's and 350's
Got Diesel?
Joined: Jan 2004
Posts: 4,345
Likes: 21
Just curious....
By disconnecting the EGR, will performance suffer in the winter when the air is cooler or very cold?
Does the recirculating of warm/hot exhaust gas help with fuel ignition or burning in cold weather? On my old 1972 Chevy Nova, there was a hose from the air-filter inlet to the manifold so it would draw in warm air... then when it warmed up, a flapper openedon the aircleaner and let in fresh and or cooler air... but the warmer air helped in cold weather starts and running.
So, in short, my question is: "What affect will we have by disconnecting the EGR valve in cold weather operation?"
Thanks,
Jeff
By disconnecting the EGR, will performance suffer in the winter when the air is cooler or very cold?
Does the recirculating of warm/hot exhaust gas help with fuel ignition or burning in cold weather? On my old 1972 Chevy Nova, there was a hose from the air-filter inlet to the manifold so it would draw in warm air... then when it warmed up, a flapper openedon the aircleaner and let in fresh and or cooler air... but the warmer air helped in cold weather starts and running.
So, in short, my question is: "What affect will we have by disconnecting the EGR valve in cold weather operation?"
Thanks,
Jeff
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Former Vendor
Joined: Mar 2004
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From: Hendersonville, NC
Originally Posted by Beachbumcook
Just curious....
By disconnecting the EGR, will performance suffer in the winter when the air is cooler or very cold?
Does the recirculating of warm/hot exhaust gas help with fuel ignition or burning in cold weather? On my old 1972 Chevy Nova, there was a hose from the air-filter inlet to the manifold so it would draw in warm air... then when it warmed up, a flapper openedon the aircleaner and let in fresh and or cooler air... but the warmer air helped in cold weather starts and running.
So, in short, my question is: "What affect will we have by disconnecting the EGR valve in cold weather operation?"
Thanks,
Jeff
By disconnecting the EGR, will performance suffer in the winter when the air is cooler or very cold?
Does the recirculating of warm/hot exhaust gas help with fuel ignition or burning in cold weather? On my old 1972 Chevy Nova, there was a hose from the air-filter inlet to the manifold so it would draw in warm air... then when it warmed up, a flapper openedon the aircleaner and let in fresh and or cooler air... but the warmer air helped in cold weather starts and running.
So, in short, my question is: "What affect will we have by disconnecting the EGR valve in cold weather operation?"
Thanks,
Jeff
By the way, how cold of a climate are we talking here?
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Former Vendor
Joined: Mar 2004
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From: Hendersonville, NC
Originally Posted by Beachbumcook
Kansas City area (Midwest).
Low side maybe -20 or so windchill with a constant temp of 0 (zero or so for a week).
Thanks,
Jeff
Low side maybe -20 or so windchill with a constant temp of 0 (zero or so for a week).
Thanks,
Jeff
Postmaster
Joined: Aug 2003
Posts: 4,483
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From: Central Texas
Two things to consider here. First is that the air gets heated when compressed going through the turbo. That is one of the reasons for the intercooler between the turbo and the engine manifold, to cool that compressed air. The second is that there is an EGR cooler that is used to cool the exhaust gases before they are sent to the EGR. Page 37 in the 6.0L Bible.
Another thing to consider is that your old Chevy Nova had a "normally aspirated" (as opposed to turbocharged) engine that sucked the air into a much lower compression cylinder and needed that warmer air until the engine heated up.
Another thing to consider is that your old Chevy Nova had a "normally aspirated" (as opposed to turbocharged) engine that sucked the air into a much lower compression cylinder and needed that warmer air until the engine heated up.