but the egr does not close when u unplug it. it stays at 3.7% duty cycle which means it is open, allowing crud in - just in smaller quantities

 

Where did you get 3.7%? How can you have a duty cycle when there is no electrical signal to the solenoid? When it is unplugged, it is fully closed in a mechanical sense.

 

When I pulled a new EGR out of the box, it was fully closed tight. If installed in that condition and not plugged in, then it should remain closed. The computer can send it signals to open up to 3.7%, but those signals would be going into thin air if the plug is pulled out. I have a question for anyone who has pulled their EGR's out of their engine to clean them. Do you find them in a fully closed position, or do you find them open a bit from the last PCM command at idle?

 

So, then, regarding 05's and the EGR...what does this mean exactly? Please -- those that know -- Do tell us! Thanks in advance!

 

Just a word of caution before you remove that EGR valve.

Federal law makes it illegal for ANYONE to tamper with, disconnect, remove or otherwise render inoperative ANY emissions-related control device. The Environmental Protection Agency and most states have actually been rather lax about enforcing this rule on motorists, but they haven't hesitated to nail professional service facilities that have been guilty of tampering. Even so, the fines can be hefty. A violation may make you liable for up to a $2,500 fine!

 

ok everyone here is a little peice of info...the egr is designed not to open on cold starts idle and WOT....only is open when cruising....my theory is that since the egr is a electrical one it would mess with the ECM , but since there is no o2 sensor to pick up the more HC the engie is putting out that it wouldnt pick up that it is running rich...which means u would be killing the pengiuns in the norht pole ;-)

my $.02

 

Thanks for the info henry. We are keenly aware or the legal ramifications.

However, in practice, it is my opinion that when the EGR valve fails in the open position it actually creates more of an environmental hazard.

For over 14,500 miles of no EGR valve function I have experienced no problems with my 6.0.

But hey, that's just me.

 

I understand the reasons for d/c the EGR, but has anyone noticed slight power loss? My truck no longer seems to "hit" as hard when it spools up and lets loose. Not only am I pushing less boost, the truck just feels "tired" and not wanting to run hard. I have noticed less time to get boost just at a lower psi. I reconnected it two days ago prior to my first "free" oil change at dealer of purchase, and noticed that the truck felt alive again. And has anyone ever Dyno'ed one with or w/o it connected. So I guess the jury is still out on this issue for me.

 

TDusseau,

I agree 100% my truck does not run near as well with the EGR disconnected. The advice I have received from technicians on other forums is the leave it (EGR) connected and make sure you drive your truck hard so that enough heat a pressure builds to keep carbon and soot from building up

 

My EGR has been disconnected for about a year / 16,000 miles. If I were to bring it in for service and it was reconnected, would it open or is it most likely frozen shut with soot? If it does open, is there a chance that a large piece of soot/carbon would dislodge and plug something else?

 

Twin...I asked this same question, almost verbatim, when these discussions where first introduced last year.The response I got, by Matt (PSD) I believe, was not to worry. With the valve closed there would not be sufficient exhaust airflow to move the bad stuff to the valve. Personally I think there could be some accumulation to be sure. But I would think it would be an insignificant amount. I am not concerned about it.

 

Do the 05's have a throttle plate? Can you tell by looking without taking off the elbow?

 

I think that it was deemed unnecessary about half way thru the '04 MY engine build. Not absolutely, positively sure though.

 

no the 05s dont have a throttle plate only the 03s and early 04s have a throttle plates.

 

Cool, My 05 has a late 04 build date so I guess I can just let my plug fall off.