I just picked up my 2004.5 D/A Extended Cab and love it. This is my first Diesel and it is awesome. Can't wait to break it in and tow the camper. I have a question that I can't find an answer to, yet anyway. On the DIC there is an option "Elevated Idle" - Off/On. What the heck is that? The dealer had no clue, even the service/parts didn't know. Can't find anything in the manual either. Thanks everyone.


Brookzie

It used when you have a PTO or when you want to avoid "wet stacking" in very cold weather.


Didn't know you access it though the DIC though...

Should be info on it in the diesel supplement manual describing what it does , and how to turn it on/off , basically it is something new on the LLY's that allows you to warm up the engine faster by idling the engine @ 1000 rpm's and somehow creating more backpressure on the turbo , thereby warming up your d-max quicker!! It cuts off when you put it in gear , but will do it everytime you start it as long as it's turned on on the DIC! Used for cold weather mostly .


Dealers , sometimes I wonder.........http://www.dieselplace.com/forum/smileys/Confused.gif

McRat


OK, you got me. What is "wet stacking"? Thanks for the info.

In very cold weather, when you let a diesel idle "cold", unburned carbon can build up in the combustion chamber. It's hard on the motor.

Thanks to both of you. I figure this thing out eventually. I've learned more lurking around here in the last week than I could have imagined. http://www.dieselplace.com/forum/smileys/Approve.gif

ccrider is correct. It's the high idle option for cold weather warm up.


If it's turned on and the ambient temperature drops below 32 degrees F, the engine is below IIRC 160, and it's in Park with the parking brake set, you'll get a high idle for warm up.

ccrider, Engine idles @ 1000 with it on, what does it idle with it off? Ive just left mine on for now...

Not sure , I'll check it tomorrow and let y'all know!!http://www.dieselplace.com/forum/smileys/Approve.gif

Never heard that wet stacking had to do with weather. On thedieselstop.com many contend that a truck can wet stack any time of the year. I have a real tough time beleiving that the big 3 would sell a truck in which I cant idle waiting on the wife in the mall. They are all nutso about it over there.

Couple of things.


The high idle on the LLY will shut off if you release the park brake, hit the brake pedal, or move the shift lever. Not sure, but I think you can turn it off by hitting the accelerator pedal as well. It will then go to the normal idle speed. It will NOT engage if the air temperature is above 32 degrees F, or the engine is warm.


Not sure what the F**d boys are talking about since I don't go there, but the big Series 60 Detroit that's in my fire truck is supposed to be left on high idle if it's parked for more than a few minutes. It's got one that can be turned on at will if the park brake is set and the trans is in neutral.


Pierce (Fire trucks) and Detroit seem quite adamant about not letting them idle for extended periods because the engines will get too cold and start glazing the cylinder walls besides the wet stacking.


So while GM doesn't seem to indicate any problem with that and our trucks, Detroit doesn't recommend it for the big diesels they build...http://www.dieselplace.com/forum/smileys/Ermm.gif

<font size="6"><font color="red">RTFM</font></font> http://www.dieselplace.com/forum/smileys/Big Smile.gif Edited by: RaceHemi

On my truck:
A) the parking brake is not needed for elevated idle.
B) Elevated idle is closer to 1400rpm
C) comes on in temps higher than 32 (as high as 40 degrees)
D) Turn it on and forget about it.