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Old 04-27-2011, 11:03 AM
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High Idle or Normal Idle for long period?

Just wondering, if I need to leave the truck running for a long time like an hour or so, is it "better" to leave it idling normally or flip my high idle (wired to the BCP, raises it to 1200rpm unloaded)?

I understood it was good for the EGR stuff to leave it high idle, but I have my EGR delete kit on the truck now. Does the high idle also prevent the turbo from getting clogged? I know people have said its bad to idle the 6.0 for long periods, but once in a while I need to and I am just wondering what the best practice is.

Thanks guys.
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Old 04-27-2011, 11:11 AM
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High idle gets my vote
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Old 04-27-2011, 11:19 AM
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I kept reading and kind of answered my own question, but I will post incase somebody searches.

First off, fuel consumption seems to be around a gallon an hour at high idle, although highly debated. That does seem high, I know CAT motored Pete 379s I have driven use about half a gal an hour and my deuce uses about a 1/3 a gal an hour idling. The best thread on this subject: How much fuel do I use idling? - Ford Truck Enthusiasts Forums

Second it seems that in the Ford manual it states the following:

Page 14 of the 6.0L Diesel Manual:
The following cold weather idling guidelines must be followed:
Avoid idling the engine for more than 10 minutes at a time.
Use Motor Craft Cetane Index improvers of a non-alcohol based from a reputable manufacturer.
Maintain the engine cooling system properly.
Do not shut the engine down after an extensive idling period (10 minutes or more). Drive the vehicle for several miles with the engine at normal operating temperatures under a moderate load to burn off any accumulated carbon and varnish.
Consider using an engine block heater.
For extended idle times use an approved idle speed increase device.

That last line ^ pretty much says to use high idle and answers my question. I assume it is mainly for the EGR valve, but also for preventing wetstacking the turbo.

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Old 04-27-2011, 11:35 AM
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My biggest fear would be wetstacking and i think the high idle should help reduce if not eliminate it.

I'm going to do the high idle mod before next winter because im in and out of the truck a lot switching to skid loaders and wheel loaders to move snow and I don't like letting the truck get cold.
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Old 04-27-2011, 12:26 PM
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Out of curiosity I must ask. What situation calls for you to need to idle your truck for an hour?
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Old 04-27-2011, 01:05 PM
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Thats what high idle is for.....if you are going to extend your idle times significantly, use high idle. But it's always better to shut her down if you can
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Old 04-27-2011, 01:14 PM
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Quote:
Originally Posted by bfrank81 View Post
Out of curiosity I must ask. What situation calls for you to need to idle your truck for an hour?
Recently? Taking a sleep break in the truck on a hot day during an extended haul or during a break from work.

Doing side of road repairs on big truck and needing additional lights for a couple hours and not having anything else to work with besides my headlights.

I do not idle it habitually, but there are situations like the above every once in a while where its the only option and cannot be avoided.
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