"Excessive" idle time - Dodge Cummins Diesel Forum
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post #1 of 60 (permalink) Old 11-17-2019, 10:25 PM Thread Starter
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"Excessive" idle time

Looking to buy a 19 2500 soon. My question is what is considered excessive when it comes to idle times. Most days i have about an hour and 30 minute wait picking up my kids. I would prefer to leave my truck running for the a/c or heater to be on. I dont baby my truck while driving and my almost daily commute is 39 miles mixed city/hwy one way. Is there anything i should worry about when doing this? Im in east texas so winter is mostly in the 40's and summers in the 90's.

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post #2 of 60 (permalink) Old 11-17-2019, 10:27 PM Thread Starter
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I should add i am going to try and not delete the truck unless this idling becomes an issue or i have problems with the emissions system from using my truck everyday.
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post #3 of 60 (permalink) Old 11-18-2019, 04:12 AM
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The owners manual will always warn about excessive idle time. I think the EPA requires that statement be included in there though. It might cause a newer truck to regen more often but I cant confirm that.

I have yet to hear about a truck thats been damaged from idling...except for the old wives-tail story about the Cummins which bent pushrods from idling a cold engine in arctic type weather. But that said, idling any ice cold engine in frigid weather is never a good idea.

Lastly, there are laws in certain areas which prevents idle times over a predetermined time frame, so make sure you're not in one of them. Other than that, I'd think you're good to pick up the kids.

I idle my trucks and cars in the summer for the AC and in the winter for the heater. My vehicles, my comfort, and my money...

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post #4 of 60 (permalink) Old 11-18-2019, 06:51 AM
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Idling diesels isn't good for them for several reasons that you can look up. Thats why you have the idle-up feature. A big advantage of the Cummins is they don't stink like a GM or FoMoCo
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post #5 of 60 (permalink) Old 11-18-2019, 07:23 AM Thread Starter
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I kind of figured it was just some EPA BS they put in there. My lst cummins was a 2012 but was deleted at 10 miles young lol. Just wanted to make sure i wasnt going to tear up some of the garbage emissions equipment with an hour or so of idling. The engine im not worried about because the temps here arent cold enough to drop my idle temp below 180. So cylinder wash isnt a real concern unless these pistons and rings are not as tight as a 2012 which i never had issues with. Sample after sample came back spotless on synthetic oil on 10k mile oil changes. I am really looking forward to getting out of this ram 1500... although its a beast... and getting back into another diesel and seeing what all you guys are doing to them and using them for
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post #6 of 60 (permalink) Old 11-18-2019, 08:36 AM
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Oil field guys let them idle all day with no issues from what I have read, talked to. In Ohio where it does get cold.
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post #7 of 60 (permalink) Old 11-18-2019, 09:05 AM
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Originally Posted by ironpony View Post
Oil field guys let them idle all day
Maybe one of a few reasons why car lots around here are full of used trucks that won't sell.
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post #8 of 60 (permalink) Old 11-18-2019, 10:28 AM
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A bit different animal but my 2013 would regen about every 20 minutes when sitting waiting to pull my boat at ramp from fishing derby’s. Sometimes id be sitting for an hour or longer.

Longevity is up for debate I agree with but the more the system regens the more likely it is to need repairs/replace parts. Nature of the beast when using components
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post #9 of 60 (permalink) Old 11-18-2019, 11:35 AM
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Ideal idling time for a diesel means 16% of total drive hours. 20% is "acceptable." In reality, there is no big issue. These modern diesels will idle up automatically in cold weather if the engine cylinder temps are getting too low, or you can manually control idle yourself with the steering wheel controls.

It is true your DPF fills up faster when the truck idles vs running the roads at RPM. However, the worst that happens is your truck performs more regenerations, which uses a bit more fuel and possibly causes a small amount of engine oil dilution with fuel. Your DPF can only handle a limited number of regens as well, which means eventually it will need to be cleaned or replaced, which might be $4k for a new one. But that is probably 200k miles away, even with a lot of idling.

Bottom line - I'll idle mine as much as I feel like it and not be concerned in the least.
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post #10 of 60 (permalink) Old 11-18-2019, 11:57 AM
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Quote:
Originally Posted by troverman View Post
Ideal idling time for a diesel means 16% of total drive hours.
I had no idea that there was an "ideal" amount of idle time. But if there is, I need to leave mine idling a lot now to catch up.

As I recall, it's at 10 hours in 11,000 miles (sorry, I don't remember the engine hours). Thankfully, it'll get a few more minutes as I hook up the trailer today.

Maybe if we start telling people that the brain is an app, they will start using it?

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post #11 of 60 (permalink) Old 11-18-2019, 12:10 PM
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Originally Posted by Jimmy N. View Post
I had no idea that there was an "ideal" amount of idle time.
I should clarify...ideal is 16% or less than total time. And that comes out of the Ford owner's manual for 6.7L Powerstrokes; maybe Cummins is different but really the aftertreatment systems are all pretty much the same.

There's talk of warranty adding another dimension: engine hours. So 5 years, 100k miles, and xx hours.
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post #12 of 60 (permalink) Old 11-18-2019, 12:15 PM
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Okay, that makes sense. Might encourage people to shut them off more often.

Maybe if we start telling people that the brain is an app, they will start using it?

'14 1500 V6, '17 3500 C&C, plus a '19 3500 6.4 in the household.
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