07 Duramax cold start- High Idle
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Uploader Comments (jawaring)
Top Comments
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God Bless American 4x4s
2 years ago 22
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Very nice ride the kind I would love to have but would cost far to much to run in the UK
2 years ago 7
All Comments (76)
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@asbres11 yes. common and cheap way to get bigger + wider tires on a duramax. not so safe or good to run 315s or 325's on the stock 16" wheel, the 17" hummer wheel is alot wider.
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are those 17" hummer wheels?
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i have the same dmax how do you turn the high idle on cuz when i go to settins and turn it on it doesent idle anyhigher than normal.
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That is a really nice truck. Maybe one day ill be lucky enough to own one.
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On modern diesels, this is a selectable mode through the dash controls. Allows you to warm the truck faster and keep it warm in very cold temps, not just at startup. It will kick into high-idle any time the truck sits for more than a minute, even when its at operating temp. Allows you to keep it warm and clean burned at -40.
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See my response to russianboy below-
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On some Duramax trucks if you plug the block heater in when it isn't that cold out you will get a code alarm.
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@nate447 all vehicles with an ECU do this, it's just to try and get the engine to warm up faster. My '98 Chevy with the 350 does it too, every car i've ever had does it
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when it is very cold out my 2500hd will do the same thing and say "ice". i havent really looked it up but does it do that through satellite or something?
smc13s 1 year ago
There is a temp sensor up front in the grill that measures the ambient temperature (for the readout on your mirror). On trucks with the Duramax, it will use this measurement to turn on a "high-idle" mode (at around 32*) that keeps idle RPM above 1,100 or so. Diesels don't warm up very fast when its cold out and they can wet stack if its extremely cold. The wet stack usually happens on older mechanical pump diesels but the high-idle speed helps both of these issues.
jawaring 1 year ago
@jawaring what is wet stacking? im new to diesels and trying to learn as much as i can
russianboy556 1 year ago
@russianboy556
When unburned fuel gets pushed through the exhaust valves, usually happens at low RPM in cold weather. Not all that common on modern diesels but happens all the time on old equipment. The result of unburned fuel makes the exhuast pipe or stack look "wet" or oily. Hence the term "wet stacking"
jawaring 1 year ago