[sampson2269]

So as some of you already know I just bought a new cummins, I've been getting mixed feelings on unplugging the egr valve some say do it some say leave it alone. Can someone give me some more insight on why I should or shouldn't' unplug it.

 

[v10sport]

Well I picked up 3 mpg when I unplugged mine. With no tuner it throws a check engine light. With the HO motor, it derates the power when unplugged and no tuner used. That doesn't seem to be with the case of the non HO motors

 

[EVRE]

Well I picked up 3 mpg when I unplugged mine. With no tuner it throws a check engine light. With the HO motor, it derates the power when unplugged and no tuner used. That doesn't seem to be with the case of the non HO motors

It does derate. My experience anyway.

 

[BigRich954RR]

unplug it see how it works for you

 

[sampson2269]

Ya I think that's what I'll do

 

[yfz350guy]

Mine Derated down to being unusable as far as towing... But it did seem to bump my mpg a bit, the loss of power wasn't worth the .5 mpg gained.

As an added bonus, my exhaust brake was nonexistent.
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[Rockwerx]

I have an HO that I tried unplugging the EGR. It definately derated the engine torque when I unplugged it. Thinking that it went to 650 ft/lbs. It pulled my 16,000 lb toy hauler without a problem however unplugging it did not yield any better fuel economy. I got exactly the same as other trips to the same place. I plugged it back in and the extra torque was there for my next trip.

The main reason that I did not see any fuel economy change is most likely because when towing the EGR system is not dumping exhaust into the intake. Bobtailing is different...little to no load on the engine and the EGR system will work more often...thus why a lot of guys report better fuel mileage when they unplug the EGR. The best thing for better fuel economy IMO is to just block it off entirely, retune the ECM and add as many air mods (ie intake and exhaust, turbo/turbos) as one can afford.

 

[v10sport]

With mine unplugged with no tuner I had zero passing power over 60 mph

 

[Snofarmer]

Where do you get it re-rated it from?
something you read?

On previous trucks the re-rate was proven to be a myth on a dyno, hp stayed the same plugged in or unplugged.

 

[yfz350guy]

Where do you get it re-rated it from?
something you read?

On previous trucks the re-rate was proven to be a myth on a dyno, hp stayed the same plugged in or unplugged.

On my truck it was simply the lack of power to get up a hill that is normally not an issue to anyone, but was a struggle with the egr unplugged.
Dyno proven or not, there is a large reduction in performance

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[slingshot383]

Couldn't you leave it plugged in and just remove the butterfly from the shaft so that it can't restrict intake airflow?

 

[jeff-kc9ftp]

Couldn't you leave it plugged in and just remove the butterfly from the shaft so that it can't restrict intake airflow?

No, by unplugging it tells the ecm something is wrong with the egr and it won't (on most trucks) try to close the butterfly. So, if it's plugged in it will still try to close the butterfly, and then throw a ETC code when it can't and send you into limp mode.

My '11.5 ran just fine with just the egr unplugged. My '08 didn't like it. I was using the edge to clear codes at that time so, I was able (and had to) remove the butterfly. Which trucks will and won't run ok with EGR unplugged is kinda hit or miss. Some are ok, some aren't.

BTW, limp mode and "derate" are 2 different things. Derate is not really noticeable, except on a dyno. Limp mode is very noticeable as it severely cuts power.

Jeff

 

[v10sport]

Couldn't you leave it plugged in and just remove the butterfly from the shaft so that it can't restrict intake airflow?

Still would push soot into the motor which is the main reaso to unplug the egr

 

[slingshot383]

Yes, but with the butterfly out of the intake, the fresh air would be the priority, not the EGR air, and with it still plugged in, it shouldn't throw a code, right?

 

[jeff-kc9ftp]

Yes, but with the butterfly out of the intake, the fresh air would be the priority, not the EGR air, and with it still plugged in, it shouldn't throw a code, right?

Yes it will....See here....http://www.cumminsforum.com/forum/5863990-post12.html

jeff

 

[Frozen Cummins]

Unplugged mine, I have no noticeable power loss. I can still drive it fast if I want, or pass with ease at 65+. Gained a few mpg too. It's staying unplugged till I get my tuner. And even though its throwing a CEL, I swear its running better. It's not chocking on its own exhaust anymore.

 

[slingshot383]

OK, maybe I'm not being clear: Just remove the butterfly from the shaft, let the shaft and EGR controller still move the shaft as if it is opening and closing the butterfly. Won't that work and not throw a code? Or, could you drill a bunch of holes in the butterfly so that it's still there, but air can flow through it.

 

[vwp6269]

I remeber reading somewhere that there is a EGR temp sensor that triggers a CEL since the EGT's are not warm enough.

 

[wuhungsix]

I have had mine unplugged for the last 1000 miles and have not felt any power loss. I only gained about 1mpg. I drive like gramps and only see about 12.5 MPG with mixed unloaded driving. This is with 35" tires.

 

[5.9 Window Cleaner]

I have my EGR unplugged and I have not noticed anything to date except the pretty yellow light staring at me. I will check milage next fill-up.