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Old 04-29-2015, 03:05 PM   #1
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Excessive Idle Time can Cause Poor Engine Performance

"Excessive idle time can cause poor engine performance". This statement is out of the Cummins manual. See the attachment. When running my engine periodically when being stored, I knew to keep the rpm's over 1000; but this is tiresome to the foot.

There is a built-in feature for setting faster idle speeds; probably half of you know and the other like me awhile ago, didn't.

With engine running, in neutral, parking brake set; put the cruise control to ON. Tap the cruise engage button once and the idle goes up to around 1,100 and stays there. Tap it again, and it goes higher. Tap the Resume button and it goes down,

This is a great most over-looked feature. In cold weather, it can be used to warm the engine up a lot quicker. I always start at normal idle first for a few minutes, to get everything oiled-up.
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Old 04-29-2015, 06:28 PM   #2
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I use this feature a lot. When warming the coach and also if I sit a redlight for a long time or if I am stuck in traffic.
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Old 04-29-2015, 06:44 PM   #3
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Originally Posted by Campin Cajun View Post
I use this feature a lot. When warming the coach and also if I sit a redlight for a long time or if I am stuck in traffic.

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Old 04-29-2015, 06:53 PM   #4
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I also use it if stuck in traffic. I also had to use it because of terrible planning on our part. That is the only reason I can explain being in below freezing temperatures when your house has wheels. I miss my nice warm Florida weather.
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Old 05-07-2015, 05:12 PM   #5
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Quote:
Originally Posted by I-RV View Post
...There is a built-in feature for setting faster idle speeds; probably half of you know and the other like me awhile ago, didn't.
Hank - I tried it and it worked as advertised. I don't think this was covered during the Camp Freightliner I attended - thanks!
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Old 05-09-2015, 08:40 PM   #6
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Ive learned over the years that the 6.7 in the Ram trucks do auto idle up when idling for extended period to kick off the "regen" process.

I noticed today that my MH went into high idle about 5 minutes after starting it. ( checking everything over for first trip of the year next week) Sure enough one of the DEF fluid lights turned off and shortly after the engine idled back down.

May or may not be a good thing for you guys that are stationary for extended periods. Not everyone has the access to a long stretch of road to get the regen started and completed.
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Old 05-09-2015, 09:43 PM   #7
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BUT, I have never been able to find a Cummins document that states exactly what 'excessive idle' means.

Is it 10 minutes, and hour, 5 hours, 12 hours?
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Old 05-09-2015, 10:39 PM   #8
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Me nether Dan. I just run mine long enough to get the air up do a last minute walk around and take it slow before I get to highway speeds. As far as I know my engine has never gone into regen.
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Old 05-10-2015, 08:49 AM   #9
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Yes, the term Excessive is nebulous. However, the technique of how to increase idle rpm with the cruise control might be valuable for those that did not know about it. The increased idle may be invaluable for warming the engine in brutal cold weather and when doing the periodic engine runs when in storage or setting for some time.
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Old 05-10-2015, 09:40 AM   #10
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Hank, I was just responding to the thread title about 'excessive idle'.
I still wish I knew what cummins considers 'excessive' since it is mentioned so often.



I use the idle up most of the time soon after starting a cold engine also if for no other reason than to maybe get the air bags up quicker.


Since I read about it on here before I bought my MH I assumed most people knew about it.
You are probably right that many do now know,
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