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ktmrfs

Portland, Oregon

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Posted: 11/22/20 08:36pm Link  |  Quote  |  Print  |  Notify Moderator

RobWNY wrote:

This thread has been interesting and a learning experience for me. My 2020 Duramax and first diesel vehicle was idling high yesterday. I thought it was too warm outside for it to be idling higher than normal. Now I understand why! Thanks for teaching this old guy something [emoticon]


duramax will also go to high idle in neutral during a cold start on cold days to help warmup. RPM will go to somewhere between 800-1000 IIRC, grid heater stays on, turbo goes to max backpressure and throttle valve is activated. All this to help warm up.

My 2015.5 warms up from cold WAY faster than my 2004.5


2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!


deltabravo

Spokane, WA

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Posted: 11/23/20 07:11am Link  |  Quote  |  Print  |  Notify Moderator

S Davis wrote:

I keep an eye on my soot level and if I am getting up there and driving more than 30 minutes I will force a regen.

How does a person "force" the truck to regen?
What year is your truck?


2009 Silverado 3500HD Dually, D/A, CCLB 4x4 (bought new 8/30/09)
2009 Arctic Fox 811 (bought new 11/9/09)
2018 Timber Ridge 24RLS (bought pre-owned 3/12/20)
2008 Haulmark 8.5x20 toy box trailer

deltabravo

Spokane, WA

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Posted: 11/23/20 07:14am Link  |  Quote  |  Print  |  Notify Moderator

ktmrfs wrote:

duramax will also go to high idle in neutral during a cold start on cold days to help warmup. RPM will go to somewhere between 800-1000 IIRC, grid heater stays on, turbo goes to max backpressure and throttle valve is activated. All this to help warm up.

Doesn't the high idle only engage if you have the setting turn on in the DIC?

On my 2009, elevated idle has to be enabled in the DIC before it engages at the OAT temp that causes it to engage

S Davis

Western WA

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Posted: 11/23/20 08:08am Link  |  Quote  |  Print  |  Notify Moderator

deltabravo wrote:

S Davis wrote:

I keep an eye on my soot level and if I am getting up there and driving more than 30 minutes I will force a regen.

How does a person "force" the truck to regen?
What year is your truck?


Truck is a 2019 Chevy and my Edge CS2 gauge will initiate a regen.

ktmrfs

Portland, Oregon

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Posted: 11/23/20 08:57am Link  |  Quote  |  Print  |  Notify Moderator

deltabravo wrote:

ktmrfs wrote:

duramax will also go to high idle in neutral during a cold start on cold days to help warmup. RPM will go to somewhere between 800-1000 IIRC, grid heater stays on, turbo goes to max backpressure and throttle valve is activated. All this to help warm up.

Doesn't the high idle only engage if you have the setting turn on in the DIC?

On my 2009, elevated idle has to be enabled in the DIC before it engages at the OAT temp that causes it to engage


Now that you mention it I think you are correct that it is a DIC setting. And default was not enabled. If so I changed mine. Been 5 years ago.......

I know on my 2004.5 there is a high idle on cold temp start setting that was an option that was enabled either through the DIC or if you didn't have the DIC readout through a set of steps you did once on a start.

On both trucks depending on how cold it is, the step from normal to high idle may take a minute or so, the colder it is, the longer it takes.

Also my 2015.5 came with the optional two stage high idle that can be engaged with the cruise control. but that high idle does not do much to help warmup, just up the idle for charging, plowing etc. when in neutral.

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