High Idle - Ford Powerstroke Diesel Forum
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Old 01-20-2014, 10:06 AM
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High Idle

What is the purpose of this in cold weather? Does it help to heat the truck up faster?
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Old 01-20-2014, 05:01 PM
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warms the truck up faster. Also high idle is key for prolonged idle to keep diesel out of your oil.
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Old 01-21-2014, 04:00 AM
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oh ok thank you so how long can you let it idle for on high idle?
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Old 01-21-2014, 04:20 AM
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I read a thread or an article years ago that had guys who lived up way north and would take their snowmobiles to hunt. They would high idle their rigs and go out for a few days. They knew the rigs wouldn't start in the hard cold so they left 'em running.
I use mine from time to time if I need to leave her running for a few hours while I'm working on things.
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Old 01-21-2014, 12:17 PM
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Originally Posted by greenmntboy View Post
oh ok thank you so how long can you let it idle for on high idle?
depends if your deleted or not. DPFs clog with alot of idle. Also unless you have the high idle mod, your truck decides when it wants to idle up.
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Old 01-21-2014, 12:19 PM
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haven't deleted it yet due to cost and warrenty
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Old 01-21-2014, 01:21 PM
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Originally Posted by PSDJohn View Post
warms the truck up faster. Also high idle is key for prolonged idle to keep diesel out of your oil.
So high idle is better than regular idle for it keeps diesel out of the oil? I didn't know that. Perhaps I will add this feature to one of my auxiliary switches in the future. I ought to use my switches for something for they are all currently useless.
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Old 01-21-2014, 01:34 PM
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My truck seems to idle up to 1000-1100RPMs below 20* and it stays at hi idle until I shift into gear, then it goes to normal, but if I shift into Neutral or park goes right back to hi idle.
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Old 01-21-2014, 02:06 PM
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I've noticed that my truck will adjust the idle to keep the engine oil temp right around 140 degrees.
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Old 01-21-2014, 06:34 PM
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Originally Posted by Dantron View Post
So high idle is better than regular idle for it keeps diesel out of the oil? I didn't know that. Perhaps I will add this feature to one of my auxiliary switches in the future. I ought to use my switches for something for they are all currently useless.
When diesels idle for an extended time they become cool and dont create enough heat to fully burn all the fuel in the cylinder which in turn causes the excess to get passed the rings and into the oil. When it gets into the oil it creates excessive wear in the engine because of low lubricity.
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