egr question before i delete
 

i just bought an 09 mega cab with g56. i hear everyone talking about taking the egr off completely and the emission pieces that go with it. can you just take the tube that goes from the exhaust to the intake that runs in the front of the engine and plug it off? and leave everything plugged in? does it sense flow? would it set a cel? ive only got 1300 miles on the engine and i want to get rid of the dirty emissions crap but at the same time i really want to keep that warranty that i have just in case. this was if something was to happen all i would have to do is put the pipe back on and go to the Dealership.

To be truthful, the CumminsForum has alot of information and testing on this. Cruise on over there..

To answer the question, you can not just plug off the tube and leave the sensors plugged in.. It does detect flow with temperature differential in the intake plenum from the movement of the servo for the EGR valves. The easiest mod so far is to just unplug the EGR valve on the intake plenum and deal with the soft glow of the CEL light.

If you are going the whole route with EGR and DPF delete, do your homework. Some systems work, some not so well and the adaptive learning of the ECM can cause problems in the future. This is most common with those that have the Edge or BullyDog PMT that delete the codes on every start-up. Those trucks (from what I have read, heard and researched so far) have the most problems down the road with rough running, poor mileage and other problems.. Those that do not delete the codes, tend to have less issues.

ya know i asked the same question over there and have yet to get an answer. i kinda figured it detected flow or temp of some kind. was just hope'n that there was an easy was out without going overboard taking stuff off this engine. i guess ill at least have to wait untill i have more miles on the ole girl before modin. or at least start buying all of the parts and do it all at one time. just thought that if for some reason i broke down on the side of the road at least i could put that pipe back on pretty easy before it went to the Dealer.

FWIW, my plug has been off since about 5000 km on it. I got used to the CEL light. I have to line up the H36 recall so I will just have to plug it back in a week before I go and it should all be good. I am waiting for the 6.7Smarty as most of the other modules are far from trouble/code free.

The long and the short of it is that you need to physically plug the tube in order to prevent EGR from entering the motor. Simply unplugging the valve on the intake horn will limit the amount going into the engine, but there are situations where the boost to drive pressure ratio is high enough to "blow open" the egr valve and allow gas to enter. This is a bad situation because there is nothing to command the return of the valve to home or 0 position.

Besides the spring that closes the valve. The actuator is not attached to the valve. It just pushes it open, and the spring pushed it closed.

Is there a way of testing to know for fact that exhaust can and does blow open the egr valve when it is unplugged, and also that it does not return to 0.

With my edge insight I monitor IAT and have never seen temperatures unplugged even close the temperature when the egr is working. Unplugged temperatures are normally around 60. When the egr is working temperatures sometimes reach 150.

With my edge insight I monitor IAT and have never seen temperatures unplugged even close the temperature when the egr is working. Unplugged temperatures are normally around 60. When the egr is working temperatures sometimes reach 150.[/QUOTE]

Around 60? in reference to outside? 150?
I've been watching he IAT temps also before my deletes the difference in temp from outside to the IAT was around 40deg. With the egr unpluged or pluged in and crossover blocked difference from outside temp and IAT is 22deg most of the time.

Yer in Luck

I king pinned the EGR unplugging over there. What do you want to know?

You really don't have to delete it, you can just unplug it and it will do the same thing.

Question. . . Are you looking to keep it looking stock? Or don't you care? I came up with several ways of doing it

i really was trying to keep it as stock looking as possible. but the more i learn about this truck the more i think that i should first do the dpf delete with a programmer, and then do the egr and egr cooler delete. i guess the only issue really is the amount of money people want for the parts!!!!

You did and I have used your reference material to answer here..:cool:

I'm still curious to know what the intake temps your talking about are.