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Old 08-02-2015, 10:15 PM   #15
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Three minutes us usually enough to let the turbo cool down after a interstate run. By the time you pull off the highway, go through a few corners into your stop for the night, you have pretty much satisfied that requirement. If you have a need to run the engine at idle for an extended period of time for whatever reason, you should set it at high idle--about 1000-1200 RPM--for the reasons mentioned. On most coaches you can do this by turning on the cruise, increase the engine speed as mentioned, and set the cruise. Prevosts actually have a high idle switch on the dash that does this for youo.

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Old 08-03-2015, 06:26 AM   #16
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Originally Posted by Hit_the_Rhod View Post
Extended idling will not have any detrimental effects on your diesel.

Okay, I stand corrected. I had not realized that extended idling at low idle could be detrimental, head hung in shame, I'll be quiet now!

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Old 08-03-2015, 06:51 AM   #17
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Originally Posted by 38Chevy454 View Post
Truckers do have a high idle setting they use, to keep enough heat in the engine.
Some (many?) MH's have a high idle setting, but I suspect many owners don't know how to engage it.

On my MH I engage high idle by revving to the desired idle speed ~800-900 rpm while pushing the cruise control SET button. To disengage, I just tap the brake.

I've also been told that excessive low speed idle results in increased unburned fuel contamination of the engine oil.
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Old 08-03-2015, 08:53 AM   #18
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The operative word in the Cummins manual is "avoid". It doesn't say "never" or "OMG!" If there is a good reason to idle, go ahead. If not, shut it down. If you do want to idle for an extended period for some reason, it's best to increase idle speed a few hundred RPMs. There is a way to do that on most every coach (on mine the cruise control handles it).
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Old 08-03-2015, 09:15 AM   #19
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It's yours. Idle it as long as you want.
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Old 08-03-2015, 09:42 AM   #20
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No unequivocal answer

Some topics just provide perennial debate (and sometimes entertainment), but no rock-solid “yes or no” answer…probably because there is none.

How should I specify my concrete pad?
Fuel additive or not?
Which brand of tires?
What tire air pressure should I run?
Which shocks are best?
Move my coach out of the shed 30 feet to wash it…or must I drive it 20 miles?
Is synthetic oil really better?
How long idling is too long?

Strangely enough, those same subjects can cause some posters such anger that they will embarrass themselves. Thanks for the calm “voice of reason”, Gary.
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Old 08-03-2015, 09:47 AM   #21
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Originally Posted by ga traveler View Post
You read correctly. We used to get bulletins in our shop about excessive idling of diesel engines. As you said, do not idle over 10 minutes.It has something to do with oil washing off of cylinder walls. I also was told this by engine reps at the Louisville show.
This is also what I was taught many years ago when I was just a rookie truck driver. Also, what everyone has said about allowing the turbo to cool after a hard run is true. Usually just cruising into a rest area or an off highway stop is sufficient, but you want to pay particular attention after a long hard pull up a grade where the engine has been working hard and give it 3-5 minutes to cool off before shutting it down. Post 2007 engines equipped with the latest anti-pollution technology can't take idling for long periods at all.

Most of the states have anti idle laws on the books now with each one being different than the next. Here is a compilation from the EPA.

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Old 08-03-2015, 09:48 AM   #22
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Saw this subject brought up several months ago. Thought the thread would never end. Lots of funny comments, harsh words , hurt feelings.

I was thinking about it last week while stuck for 7 hours in a traffic jam.
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Old 08-03-2015, 09:52 AM   #23
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I am a trucker and when sleeping in the truck I bump the idle up to 900 only if I require heat. Idling is not good for trucks but we have no choice. In fact most of our engine problems on our fleet of 2013 cummins powered trucks are related to the excessive idling. Some of the drivers who get home most nights hence much less overnight idling , burn less oil between services. I only idle the motorhome as needed.
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Old 08-03-2015, 10:03 AM   #24
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I find that leaving the coach motor running for the very few minutes it takes to level and extend the slides once I get where I'm going means it's idled for 3-5 minutes. When I pull it into my storage space back home - the minute or two it takes to walk thru the coach making sure the windows are locked and blackout shades are pulled down gives me a couple minutes of idle time on that end of the trip as well. If/when I stop on the road - I usually let it idle for a minute or two before shutting it off. The first rule is there ain't no rules.
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Old 08-03-2015, 10:57 AM   #25
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How come nobody mentioned additional REGEN cycles required because of excessive idling? This all started with the DEF injection.


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Old 08-03-2015, 11:26 AM   #26
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No it started long ago. I was trucking in the 70s & 80s and excessive idle was a big deal then as well.

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Old 08-03-2015, 01:04 PM   #27
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Was listening to Car Talk a while back and learned something.
When I wore a younger man's cloths they told us not to idle gasoline engines because it would gum up the works and if it was a BIG engine could overheat.. in fact many city police cars, when a suspect tries to run from 'em on the freeway, the police car used to 25-30 MPH (Fast idle) just dies (State police cars used to around 60 on the freeway ran just fine,,, Much to the surprise of many suspects).

Disels of that era on the other hand could idle all day without issue in fact in some cases it was easier on them than shutting down.

Today: Per Click and Clack, the Tappit Brothers (Car talk) That has changed.

With computer controls the gasoline engine is able to idle for long periods of time where as the DIESEL with modern emmissions (DEF) does not get hot enough at idle for everything to work properly.

This is per them. What do I know about it? (Not a diesel expert by any means).
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Old 08-03-2015, 01:48 PM   #28
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Originally Posted by dpinvidic View Post
How come nobody mentioned additional REGEN cycles required because of excessive idling? This all started with the DEF injection.



Just paid a pile of money to have my dpf filter replaced. Part of the diagnosis indicated "high idle time". I didn't think I idled that much until doing some simple math. Highway hours versus fuel stops, lunch breaks, traffic stops, airing up. With all the new expensive emission controls excessive idling has even worse consequences.

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