In very cold weather, should I idle until the RPM settles down? - Page 5 - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #41 of 69 (permalink) Old 11-23-2019, 09:52 AM
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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
Fwiw, my post above is cut/past from the 2015 dmax supplement.

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

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post #42 of 69 (permalink) Old 11-23-2019, 07:22 PM
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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

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post #43 of 69 (permalink) Old 11-24-2019, 08:51 PM
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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
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post #44 of 69 (permalink) Old 11-25-2019, 06:59 AM
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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.


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post #45 of 69 (permalink) Old 11-25-2019, 08:09 PM
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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.
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!

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post #46 of 69 (permalink) Old 11-26-2019, 07:48 AM
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Blah... I just start it and go. By the time Iím out of the driveway itís good to go....

But then again itís 70 degrees here. Lol.

Couldnít resist.

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post #47 of 69 (permalink) Old 11-26-2019, 10:47 AM
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Quote:
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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!
Living in Fairbanks would be a justification to run your truck 24 hours a day all winter long in my book
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post #48 of 69 (permalink) Old 11-26-2019, 06:45 PM
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Living in Fairbanks would be a justification to run your truck 24 hours a day all winter long in my book
At the time I had a 79 Ford Bronco. Even gassers can get to be a pain to start in those temps.

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post #49 of 69 (permalink) Old 11-28-2019, 07:51 PM
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Quote:
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Living in Fairbanks would be a justification to run your truck 24 hours a day all winter long in my book
I live in Delta Junction, about 100 miles from Fairbanks, but usually even colder here lol. Iíve been tempted to idle mine a lot more than I do.
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post #50 of 69 (permalink) Old 11-30-2019, 04:54 PM
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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.

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