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post #1 of 16 Old 05-14-2008, 05:21 AM Thread Starter
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EGR question

I've seen alot of posts about how to delete the EGR. They all talk about welding the hole shut. My question is, what happens when you just unplug the EGR? Does it lock in the open or closed position? If it's the open then I can see welding the plate shut and deleting the EGR.

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post #2 of 16 Old 05-14-2008, 06:26 AM
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I'm not a tech, but I would think that just "unplugging" the egr would cause it to post DTC's and a CEL.



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post #3 of 16 Old 05-14-2008, 02:28 PM Thread Starter
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Unplugging it actually made my dtc's go away. If you would weld the flang shut and delete the egr it would send dtc's also wouldn't it?
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post #4 of 16 Old 05-14-2008, 02:36 PM
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call me a newb if you want what is the purpose of the egr? what does it stand for and why do people block it off? sorry, i dont mean to hijack the thread

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post #5 of 16 Old 05-14-2008, 06:07 PM
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Unplugging it will prevent exhaust from reentering the intake, so that will work and some do and some don't throw a CEL based upon the year of truck and the PCM strategy. You might also want to block off the EGR cooler, so the hot exhaust gasses don't get dead headed due to the closed EGR valve and heat soak the cooler. These EGR coolers are notoriously weak, so you should consider blocking them off.
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call me a newb if you want what is the purpose of the egr? what does it stand for and why do people block it off? sorry, i dont mean to hijack the thread
EGR stands for Exhaust Gas Recirculation, which means that some of your exhaust is reinjected into your manifold to reduce emissions. People block it off because the EGR valves get coated in soot and stop working properly. The EGR valve is commanded open only when the engine is operating at a certain level, not all the time, so when it gets stuck open, the engine starts to run pretty poorly (surging, stalling, generating black smoke, etc).

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post #6 of 16 Old 05-14-2008, 06:23 PM
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Yup,,, Shawn said it well

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post #7 of 16 Old 05-15-2008, 06:46 AM Thread Starter
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Awesome, so unplugging it does lock it closed. How do I block off the EGR cooler? Thanks for the help.
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post #8 of 16 Old 05-15-2008, 06:50 AM
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how do you unplug it?

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post #9 of 16 Old 05-15-2008, 10:40 AM
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Quote:
Originally Posted by swasenko View Post
Awesome, so unplugging it does lock it closed. How do I block off the EGR cooler? Thanks for the help.
Install either a block off plate or freeze plug at the y in the up-pipe leading to the EGR cooler.
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how do you unplug it?
Disconnect the wiring harness on the EGR valve.

Shawn Carlson
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Gogo Diesel Direct Drive Solenoid
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Icon Adjustable Trac Bar
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post #10 of 16 Old 05-15-2008, 07:44 PM
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[quote=Evil Eye;585249]Unplugging it will prevent exhaust from reentering the intake, so that will work and some do and some don't throw a CEL based upon the year of truck and the PCM strategy. You might also want to block off the EGR cooler, so the hot exhaust gasses don't get dead headed due to the closed EGR valve and heat soak the cooler. These EGR coolers are notoriously weak, so you should consider blocking them off.

I've had my EGR cooler unplugged for the last 5000 miles or so, and have had no issues. I just read in the June 2008 issue of Diesel Power (Postal Route pg. 29) that the '03 and early '04 had a better designed cooler, so maybe those ones are less prone to failure.

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