Jump to content

High Idle

gSwift

By gSwift
in 6.6L Duramax Diesel (L5P)

 Share

Recommended Posts

gSwift Enthusiast

gSwift

Posted
Posted

I've read a few things in the owners manual and saw a YouTube video of a Chevy 2500 that had the high idle feature. I have a pretty highly optioned 2500 AT4 Diesel and can't seem to get it to work. 

 

Anyone else have the feature and been able to get it to work?

 

 

sdelam Enthusiast

sdelam

Posted
Posted

Set the parking brake, hold the cruise button down a few seconds and release. Works ok for me. Check your window sticker/ build sheet. Its  $200 option. The dealer should be able to set it up if you dont have it since its software only. 

gSwift Enthusiast

gSwift

Posted
  • Author
Posted
9 hours ago, sdelam said:

Set the parking brake, hold the cruise button down a few seconds and release. Works ok for me. Check your window sticker/ build sheet. Its  $200 option. The dealer should be able to set it up if you dont have it since its software only. 

Yeah I don't see it on the window sticker. I'll look into having the dealer set it up

gSwift Enthusiast

gSwift

Posted
  • Author
Posted
On 7/13/2020 at 8:11 AM, sdelam said:

Set the parking brake, hold the cruise button down a few seconds and release. Works ok for me. Check your window sticker/ build sheet. Its  $200 option. The dealer should be able to set it up if you dont have it since its software only. 

No rush, but if you get a chance can you take a picture of what its listed as on your window sticker? My dealer hasn't been much help. They keep trying to tell me that I don't have PTO and I keep trying to explain to them that's not what i'm referring to. 

 

They don't seem to understand that Elevated Idle, Fast Idle, and Power Take-off are all different features.

sdelam Enthusiast

sdelam

Posted
Posted
12 minutes ago, gSwift said:

No rush, but if you get a chance can you take a picture of what its listed as on your window sticker? My dealer hasn't been much help. They keep trying to tell me that I don't have PTO and I keep trying to explain to them that's not what i'm referring to. 

 

They don't seem to understand that Elevated Idle, Fast Idle, and Power Take-off are all different features.

Honestly the only thing I have used it for is if I have to make a stop during a regen. 

307E5B9F-37AF-4D13-B895-1C2A97105369.jpeg

gSwift Enthusiast

gSwift

Posted
  • Author
Posted
2 hours ago, sdelam said:

Honestly the only thing I have used it for is if I have to make a stop during a regen. 

307E5B9F-37AF-4D13-B895-1C2A97105369.jpeg

Thank ya sir! Yeah I probably wouldn't use it often, or at all

Colossus Senior Enthusiast

Colossus

Posted
Posted

Regen only works based upon MPH not idle speed unless it is a commanded regen via the Tech-II tool. 

sdelam Enthusiast

sdelam

Posted
Posted
On 7/19/2020 at 5:37 AM, Colossus said:

Regen only works based upon MPH not idle speed unless it is a commanded regen via the Tech-II tool. 

The high idle will help keep the exahust temps up though. I find it lets the truck finish the regen when I start driving again as oppsed to ending early and having the truck restart from a cold exhaust. Maybe its all in my head and I just need a reson to use the $200 option. Idk. 

  • 1 month later...
Dave mags Enthusiast

Dave mags

Posted
Posted

I was told it can't be added when i asked my dealer last winter

The elevated idle will keep exhaust temps up in cold weather to prevent wet stacking 

I try not to just idle at anytime 

just shut it down 

also a no idle law in CT

 

 

kylant Enthusiast

kylant

Posted
Posted

my truck does not have that option.

however, the overnight temp the other day was down to about 35*. I remote started the truck. When I came out to it, it was definitely in a high idle state

redwngr Senior Enthusiast

redwngr

Posted
Posted (edited)

There are two ''increased idle 'different functions.  One is standard, the other is optional

 

In addition, the ecm will also sometimes adjust idle for alternator charging, ac compressor, high engine temp or in regen to keep exhaust from cooling. (and there may be other reasons....)

 

 

Elevated Idle  is standard on all the dmax's since 2004.5 LLY.  It needs to be enabled in settings, but then will  automatically engage if the correct conditions are met. It drags the torque converter to create additional load, to warm the transmission as well as the coolant.  

Since it has automatic engage it is great during cold weather when the truck is started by remote. I find that elevated idle will result in the highest transmission temps my trucks will have doing rural daily driver chores in winter weather.

 

Elevated Idle
The engine has a cold temperature high idle feature which elevates the engine idle speed from base idle to 1050 to 1100 rpm when outside temperatures are below 0 °C (32 °F), and the engine coolant temperature is below 65 °C (150 °F). This feature enhances heater performance by raising the engine coolant temperature faster.
To turn this feature on or off, see Vehicle Personalization 

 

[ Edit to add: My current truck will kick in elevated idle at temps higher than my previous ones. (an LLY and a LML).  Despite the 32*F indicated in the manual I find this one will kick in at temps somewhere between 38F and 42F on the dash display]

 

When the engine is started, it will slowly ramp up to the high idle speed after a delay of a few seconds up to approximately two minutes. For this method to work properly there must be no throttle or brake pedal faults.

 

The engine idle speed will return to normal once the following conditions are met: 

. Engine coolant temperature reaches 65 °C (150 °F).
. Air intake temperature reaches 0 °C (32 °F).
The high idle speed will be temporarily interrupted and the engine speed will return to normal if any of the following conditions occur:
. The brake pedal is applied.
. The accelerator pedal is pressed.
. The transmission is shifted out of P (Park) or N (Neutral).
. Vehicle speed is detected.
Once these inputs are removed, the engine idle speed will slowly ramp back up to high idle after the normal delay, if the conditions for engine coolant temperature and air intake temperature are still met. 

 

 

High Idle / Fast Idle

 

The other one is optional, and is operated by the cruise buttons - as in the video above.

Sometimes called High idle. Sometimes called Fast Idle.

 

Primary use if to keep accessories (and PTO is equipped) drive running faster.  Its'not intended create heat the way the elevated idle does. 

Fast Idle requires getting into the truck to activate.

 

2020 dmax manual calls it Fast Idle.

 

Fast Idle Control

 

If equipped, this system can be used to increase the engine idle speed.

 

Fast Idle control will be enabled when the following conditions are met:
. The parking brake is set.
. The transmission is in P (Park) or N (Neutral).
. The vehicle speed is about 0 km/h (0 mph).
. The cruise control Set switch is pressed and released for Preset

 

Fast Idle Speed (1200 rpm). Fast Idle control will be disabled when one or more of the following conditions occur:
. The cruise control Set switch is pressed and released. See “Cruise Control” in the owner’s manual.
. The cruise control Cancel switch is pressed.
. The brake pedal is pressed.
. The transmission is shifted out of P (Park) or N (Neutral).
. The parking brake is released.
. The vehicle speed is not 0 km/h (0 mph). 

 

 

Fast/High idle is slightly higher rpm than Elevated idle.  I've alway assumed it was to aid in identifying why the truck was not at 'normal' idle. 

 

When the truck is in regen, it will idle at higher rpm than normal - but not as high as these two functions.

 

Edited by redwngr
  • Like 1
Colossus Senior Enthusiast

Colossus

Posted
Posted

The trucks will also jump up 200 RPM or so on a cold start, after about 20 seconds.  this generally lasts for about 30 seconds to a minute.  It aids in getting sensors and such warmed up.  I only notice it when the outside temps are below 50 degrees. 

  • 3 months later...
Brozat4 Enthusiast

Brozat4

Posted
Posted
On 7/19/2020 at 3:37 AM, Colossus said:

Regen only works based upon MPH not idle speed unless it is a commanded regen via the Tech-II tool. 

I know all of the documents state this, but is it 100% accurate? I have the "Fast Idle" option and I use it often as my truck is my mobile office and I idle alot at work. Sometimes while using the Fast Idle it definately smells like my truck is doing a regen when your near the back, even if I haven't moved it in a while. Thoughts?

  • 1 month later...
leverett.scott Enthusiast

leverett.scott

Posted
Posted
There are two ''increased idle 'different functions.  One is standard, the other is optional
 
In addition, the ecm will also sometimes adjust idle for alternator charging, ac compressor, high engine temp or in regen to keep exhaust from cooling. (and there may be other reasons....)
 
 
Elevated Idle  is standard on all the dmax's since 2004.5 LLY.  It needs to be enabled in settings, but then will  automatically engage if the correct conditions are met. It drags the torque converter to create additional load, to warm the transmission as well as the coolant.  
Since it has automatic engage it is great during cold weather when the truck is started by remote. I find that elevated idle will result in the highest transmission temps my trucks will have doing rural daily driver chores in winter weather.
 
Elevated Idle
The engine has a cold temperature high idle feature which elevates the engine idle speed from base idle to 1050 to 1100 rpm when outside temperatures are below 0 °C (32 °F), and the engine coolant temperature is below 65 °C (150 °F). This feature enhances heater performance by raising the engine coolant temperature faster.
To turn this feature on or off, see Vehicle Personalization 
 
[ Edit to add: My current truck will kick in elevated idle at temps higher than my previous ones. (an LLY and a LML).  Despite the 32*F indicated in the manual I find this one will kick in at temps somewhere between 38F and 42F on the dash display]
 
When the engine is started, it will slowly ramp up to the high idle speed after a delay of a few seconds up to approximately two minutes. For this method to work properly there must be no throttle or brake pedal faults.
 
The engine idle speed will return to normal once the following conditions are met: 
. Engine coolant temperature reaches 65 °C (150 °F).
. Air intake temperature reaches 0 °C (32 °F).
The high idle speed will be temporarily interrupted and the engine speed will return to normal if any of the following conditions occur:
. The brake pedal is applied.
. The accelerator pedal is pressed.
. The transmission is shifted out of P (Park) or N (Neutral).
. Vehicle speed is detected.
Once these inputs are removed, the engine idle speed will slowly ramp back up to high idle after the normal delay, if the conditions for engine coolant temperature and air intake temperature are still met. 
 
 
High Idle / Fast Idle
 
The other one is optional, and is operated by the cruise buttons - as in the video above.
Sometimes called High idle. Sometimes called Fast Idle.
 
Primary use if to keep accessories (and PTO is equipped) drive running faster.  Its'not intended create heat the way the elevated idle does. 
Fast Idle requires getting into the truck to activate.
 
2020 dmax manual calls it Fast Idle.
 
Fast Idle Control
 
If equipped, this system can be used to increase the engine idle speed.
 
Fast Idle control will be enabled when the following conditions are met:
. The parking brake is set.
. The transmission is in P (Park) or N (Neutral).
. The vehicle speed is about 0 km/h (0 mph).
. The cruise control Set switch is pressed and released for Preset
 
Fast Idle Speed (1200 rpm). Fast Idle control will be disabled when one or more of the following conditions occur:
. The cruise control Set switch is pressed and released. See “Cruise Control” in the owner’s manual.
. The cruise control Cancel switch is pressed.
. The brake pedal is pressed.
. The transmission is shifted out of P (Park) or N (Neutral).
. The parking brake is released.
. The vehicle speed is not 0 km/h (0 mph). 
 
 
Fast/High idle is slightly higher rpm than Elevated idle.  I've alway assumed it was to aid in identifying why the truck was not at 'normal' idle. 
 
When the truck is in regen, it will idle at higher rpm than normal - but not as high as these two functions.
 
Thanks for the info.

Sent from my SM-G981V using Tapatalk

  • 2 years later...

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,925
    Total Members
    8,960
    Most Online
    btm
    Newest Member
    btm
    Joined

  • Who's Online   3 Members, 0 Anonymous, 1,323 Guests (See full list)

  • Latest Articles

  • Posts

    • CamGTP
      Gas Prices

      By CamGTP · Posted

      Can ask that about a lot of places.   Holiday sells 91 for $1 over 87 octane. BP 93 is 80 cents. Amoco 93 is 80 cents Kwik Trips is $1.20 for 92 or whatever they have and $1 for the 91.   I know that this is not exactly same as what you are saying with the premium to premium debate of those two stations but why is there such a difference. Top Tier this and that, it's all BS. All the fuel comes from the same damn refinery, so give me a break.
    • Grumpy Bear
      Gas Prices

      By Grumpy Bear · Posted

      Why does Mobil Premium cost 90 cents a gallon more than Shell Premium when their regular offerings are but pennies apart? 
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      Was all the way down to $3.69 a gallon but then jumped back to $3.99 just because for some reason.   Diesel floats between $4.80's to $5.10ish a gallon. I even saw Diesel #1 for $6.09 today but nobody in there right mind even buys that in the summer.
    • Coastie05
      OTA updates and radio still cuts out

      By Coastie05 · Posted

      Mine just keeps lagging or getting stuck on the reverse camera. When I turn off the truck, get out, and close the door it will still stay on. It’s very intermittent and I would not be able to duplicate the issue. 
    • Chuck FB
      Gas Prices

      By Chuck FB · Posted

      I was checking out fuel prices at my farm fuel retailer at their pumps and yes the farm price is a bit lower than the non dyed fuel and was glad to see that the regular farm gas price has dropped a lot from what it had been but what blew me away was the price of diesel as the spread now compared to before the prices went up earlier in the year, diesel was actually slightly lower than gas which was a switch from the theme the last number of years. However that sure isn't the theme lately and definitely not right now. The prices I will post are not from that retailer but just looking at gasbuddy for the main city in this area and instead of posting the lowest price someone found I will list the higher price ( and that may not be the highest price, just whatever someone posted on gasbuddy ).   So regular gas and there are a lot of stations listing the same price for regular is 1.68 a liter, premium 2.00 a liter. Diesel 2.03 a liter for a top price I saw on diesel.   Figures out to 6.36 a us gallon Canadian funds for regular and 7.68 for diesel. With the US exchange rate it would be 4.58 us for regular and 5.53 for diesel.    Thought I would figure that out to get a picture of what it settles out like compared to various US prices and its about the same as the current price in Fairbanks AK as Anchorage tends to be lower. So yes, these would be the prices and higher along the way on the Alaska highway where they know they have a captured market !, for fuel prices for those beginning the long drive back to the lower 48   The problem is our Canadian dollar and going to the states that have the high prices, boy do we pay then !

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...