DuramaxForum Fanatic
Join Date: Feb 2011
Location: SW Ont
Posts: 5,664
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Quote:
Originally Posted by sambor View Post
Duramax Dan
The high idle is RPO UF3 like redwngr stated. It has only one speed--1000 rpm on trucks. The upspeed on PTO trucks( almost all WT's/ cab and chassis) is 3 different speeds: 900/1200/1900. Last 2 3500's and current 4500 have had this system. If you want to verify the info look at tech bulletin 120F on upfitters site.
By the way, the high idle speed UF3 on anything other than a van is 1000 rpm not 1200. That is the speed for vans.
Guess we have beat this thread to death-- at least until next cold season and new owners didn't get an owners manual.
By the way redwngr, can you edit your post to include the PTO speed info and sticky note it for future use? People seem to confuse elevated idle with high/fast idle
The high idle is RPO UF3 like redwngr stated. It has only one speed--1000 rpm on trucks. The upspeed on PTO trucks( almost all WT's/ cab and chassis) is 3 different speeds: 900/1200/1900. Last 2 3500's and current 4500 have had this system. If you want to verify the info look at tech bulletin 120F on upfitters site.
By the way, the high idle speed UF3 on anything other than a van is 1000 rpm not 1200. That is the speed for vans.
Guess we have beat this thread to death-- at least until next cold season and new owners didn't get an owners manual.
By the way redwngr, can you edit your post to include the PTO speed info and sticky note it for future use? People seem to confuse elevated idle with high/fast idle
The confusion is why I copied the instructions for both 'elevated idle' and 'high/fast idle' in one post above.
Elevated idle is the one that is for cold weather engine/transmission warm up.
PTO operation is 10 pages of text and tables of info in the Dmax Supplement.
It's usage will be dependant on the PTO accessory that has been added.
Here is a link to the 40 page Bulletin at the gmupfitter site regarding the PTO for anyone that has one and needs more information.
https://www.gmupfitter.com/files/med...-2018DEC21.pdf
2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY
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Duramax Lifetime Supporter
Join Date: Oct 2014
Location: Weatherford Texas on a 25 acre horse farm
Posts: 177
Thank you for posting the info. It is a long procedure but the basics are similar to the high idle except for the 3 speeds
2019 Chevrolet 4500HD CC 4X4 Flatbed
2018 Chevrolet 1500 CC 4X4 High Country 6.2 liter
2019 Chevrolet 3500HD CC 4X4 Flatbed--SOLD
2011 Peterbilt 337 hauler with 360HP 8.3 Cummins--SOLD
1957 GMC 1 ton flatbed with 22K original miles.
3 different Kubotas
2003 Chevrolet 2500HD CC: 2011 Chevrolet 3500HD CC 4X4 and 2013 3500HD ex. cab 4X4-- all sold.
Duramax Lifetime Supporter
Join Date: Oct 2013
Location: New York
Posts: 235
I have always let all my trucks warm up for a bit. I don’t like to run a cold engine cause you could end up breaking something. Just my 2 cents
2008 LMM CCSB, EFI LIVE, EDGE INSIGHT CTS2 and EGT, 5" MagnaFlow straight pipe, 3" magnaflow down pipe,
Goerend Torque converter
FASS 150
Soon to be installed 68mm Stg2 from Danville, High Flow Manifolds and Up Pipes, Trans will be built by New Limit Motorsports
https://www.facebook.com/NewLimitMot..._BWhovYLhRy4Cw
http://www.bamaoffroad.com/
MORE TO COME
Goerend Torque converter
FASS 150
Soon to be installed 68mm Stg2 from Danville, High Flow Manifolds and Up Pipes, Trans will be built by New Limit Motorsports
https://www.facebook.com/NewLimitMot..._BWhovYLhRy4Cw
http://www.bamaoffroad.com/
MORE TO COME
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Junior Member
Join Date: Oct 2011
Location: Florida
Posts: 198
At -17 (0F) I'll remote start and let my truck idle for the full 10 minutes. When I get in, the engine temperature gauge is still pinned COLD but at least my seat is warm. After driving for 10 minutes at 80kmh the gauge is half way to normal unless I have my 5er hooked up in which case the gauge reads normal in less than 2 minutes. I use the raw egg technique on the go pedal when cold - always the least amount of throttle to get to the speed I need.
2011 Silverado 3500HD Duramax dually 4x4 CCLB LTZ STOCK
Reese 20K 5th wheel hitch
BakFlip hard folding tonneau
2011 Voltage 3950 Toy Hauler holding
her Harley Ultra / DFT trike
my Harley Ultra
Duramax Lifetime Supporter
Join Date: Oct 2016
Location: Maurice, LA
Posts: 4,073
Quote:
Originally Posted by J83 View Post
If it makes you feel any better my trucks been remote started for the last 15 minutes so i can be warm on my way to lunch.
2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
Junior Member
Join Date: Jul 2015
Posts: 92
Blah... I just start it and go. By the time I’m out of the driveway it’s good to go....
But then again it’s 70 degrees here. Lol.
Couldn’t resist.
But then again it’s 70 degrees here. Lol.
Couldn’t resist.
2006 LBZ crew regular bed
285/70r17
Daily driver
Horse hauler
No other mods
280k and going strong.
DuramaxForum Enthusiast
Join Date: Apr 2014
Location: Alaska
Posts: 4,706
Quote:
Originally Posted by 407driver View Post
Yeah but sitting on that seat, as hard as a wooden bench when it is REALLY cold is still not pleasant, like in Fairbanks (Ft Wainwright) in the Winter and Spring!
2015 Chevy Silverado 2500 HD 6.6L LML
Duramax Lifetime Supporter
Join Date: Oct 2016
Location: Maurice, LA
Posts: 4,073
Quote:
Originally Posted by J83 View Post
Living in Fairbanks would be a justification to run your truck 24 hours a day all winter long in my book
2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
Junior Member
Join Date: Jan 2015
Posts: 234
Quote:
Originally Posted by J83 View Post
Living in Fairbanks would be a justification to run your truck 24 hours a day all winter long in my book
Junior Member
Join Date: Nov 2017
Location: Rhodes Mi
Posts: 29
I let mine run for about a minute then drive it away but with my banks exhaust brake the exhaust brake stays on until 135degrees then it disengages it. The motor heats up quicker due to the exhaust restriction, pulling my 5th wheel I will warm the truck up 2-4 minutes. I also do not run my truck in the winter due to the corrosive salt they use on the roads around so from November 30 to April- June depending on the year I put it back on the road, one of these days I plan on moving to a warmer climate than Michigan then salt will no longer be an issue.
2003 Silverado Fass 165, 45% over injectors, Banks big head, Banks 6 gun, Banks Exhaust and filter. Bed Carpet, Pace Edwards electric Tonneau Cover. 122000 miles
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