How Long? - Chevy and GMC Duramax Diesel Forum

01-04.5 LB7 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 #1 of 9 (permalink) Old 06-05-2012, 03:21 PM Thread Starter
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How Long?

How long do you guys let your truck idle for when you start it first thing in the morning? (or after sitting for a long period of time) Should it run for longer the colder it is outside?

How long do you guys let the truck cool down for after driving it for a while?

I usually let mine run for about 5 mins in the morning but I'm wondering if its a waste of fuel or if I'm not running it long enough. As far as letting it cool down, I generally don't because I work about 15 mins from home so the truck doesn't run for too long. But when i do make longer trips I'll usually let it cool down for 5 mins or so.

So what do you guys think? Waste of fuel? or good idea?

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Last edited by 01 Duramax 3500; 06-05-2012 at 05:43 PM.
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post #2 of 9 (permalink) Old 06-05-2012, 06:29 PM
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post #3 of 9 (permalink) Old 06-05-2012, 06:34 PM
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depends on temp but i think its always a good thing to let things warm up some before operating not to mention a diezel always takes a bit longer to get up to 190

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post #4 of 9 (permalink) Old 06-05-2012, 06:37 PM
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summer, about 2 min warm up.
winter 5-10 depending on temp.
keep a fuel additive in it and drive...

that's what i do atleast.

NEW TRUCK- 2006 LBZ cc/sb loaded southern coach, smoky mountain sportsman edition, 20" black hostile havoc's, 305/50/20 nitto trail grapplers, EFI LIVE by rob at ATP performance, 5" exhaust, transgo jr, egr blocked, pcv rerouted, isspro ev2 gauges, tinted windows, just gettin started!
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post #5 of 9 (permalink) Old 06-05-2012, 06:42 PM
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Usually i let mine warm up for 5-10 in the summer and around 20 in the winter if its real cold out even if its plugged in. I would rather spend and few bucks in fuel and let the oil warm up and everything get moving for a while before i get started. Also I get on the interstate about 3 minutes after leaving my house.

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post #6 of 9 (permalink) Old 06-05-2012, 06:45 PM
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A minute on idle when its above 40 then switch on high idle for 3 to 5 minutes depending on the temp. Under 40, I let the truck do her thing with elevated idle. For an LB7 I would just switch on the high idle and let it sit for 5-10 min. Might burn more fuel, but its nice going into a warm truck. As for cooling down, I just wait until the egt's hit 350 degrees.

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post #7 of 9 (permalink) Old 06-06-2012, 03:18 AM Thread Starter
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I don't remember where, but i read an article somewhere that said with a gas vehicle letting the car or truck warm up was just a waste of gas (ill try to find the article) but i figured with diesel it must be different (especially in the winter)

I know with our rigs at work we usually let them warm up at least 10 mins before we drive them but as far as cool down goes, we just shut them off when we get to where we need to be.

Anyone else?

R.I.P
'01 GMC Sierra EXT Cab 3500 Dually
Air lift- Air ride suspension
Air Dog II 165
Magnaflow 4" turbo back exhaust
9" in dash DVD/Navigation with back up camera
Firestone Destination MT's
Newsed Truck
2005 Chevrolet Silverado 3500 Crew Cab Dually
Extang tri-fold hard cover
BONE STOCK Less miles than my bicycle
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post #8 of 9 (permalink) Old 06-06-2012, 06:53 AM
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around here in south/western MT, I let it idle anywhere between 5-10 minutes, come next winter both our trucks will be garaged, so that should help it along a bit.
I can plug mine in, but have not had the need to do that....yet.

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post #9 of 9 (permalink) Old 06-06-2012, 08:06 PM
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Winter I let mine idle for about 10min or so. Summer I usually let it idle for a min or two. It is a gradual down hill on my way out of town so it has an easy first few miles drive.

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