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Old 04-05-2014, 11:18 AM   #15
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Thanks to all for the replies. I can understand the fuel waste and air pollution, but my main concern was with engine damage from "excessive idling". I always try to keep it at under 10 minutes. There were times, while driving through Yellowstone, that animals on the road kept me at a dead crawl for longer than 10 minutes at idle rpm, but that doesn't happen often.
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Old 04-05-2014, 11:21 AM   #16
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Originally Posted by Wrinklemeist View Post
SRAlpine,
My 05 doesn't have the high idle switch unless I just can't find it.
If you have a smart wheel it is most likely part of your cruise control. Turn the cruise on, then quicky tap the accel/resume button twice. Tapping twice again speeds it up further. Tapping the set button twice reverses the process. Turning the cruise off or hitting the brake pedal will return you to slow idle.
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Old 04-05-2014, 11:41 AM   #17
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Quote:
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If you have a smart wheel it is most likely part of your cruise control. Turn the cruise on, then quicky tap the accel/resume button twice. Tapping twice again speeds it up further. Tapping the set button twice reverses the process. Turning the cruise off or hitting the brake pedal will return you to slow idle.
On my Smart Wheel I tap Cruise ON, then tap SET, and it goes to 1k rpm.

Quote:
Does anyone know if fast idling prevents the engine damage regular idling causes?
Fast idle gets the oil pressure and alternator operation up to a much better level, so would definately be potentially less harmful than a low idle.
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Old 04-05-2014, 01:39 PM   #18
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I will try that out. I only recently learned that you can check your transmission fluid level with the transmission selector--but I have forgotten how to do it!!
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Old 04-05-2014, 01:49 PM   #19
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I wonder why there is so much concern for idling Diesels? Truckers idle for hours on end when they are sleeping. Isn't a diesel a diesel?
Diesels used to be that way before they stuck the computers and high dollar injectors on them. The old diesels once warmed up would idle for days and not harm a thing.
I like my diesels like Joe Walsh like his music Analog.
My favorite CD/album is "Analog Man"
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Old 04-05-2014, 03:46 PM   #20
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There are plenty of things worth worrying about. Idling a diesel in a motorhome application isn't one of them.
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Old 04-05-2014, 04:47 PM   #21
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OK, my smart wheel works as advertised. Turn on cruise, tap resume, and high idle kicks in. It also disables the accelerator pedal. Hit cancel or off, and idle returns to normal and the pedal works again.
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Old 04-06-2014, 07:37 AM   #22
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OK, my smart wheel works as advertised. Turn on cruise, tap resume, and high idle kicks in. It also disables the accelerator pedal. Hit cancel or off, and idle returns to normal and the pedal works again.
It should also cancel if you tap the brake pedal.
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Old 04-06-2014, 09:29 AM   #23
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Lots of good reasons and rationales for when and how long to idle your engine. Like to throw one other issue into the mix. Seems our ISL 400s have a problem with exhaust manifolds cracking over time--my 03 cracked at about 50k and 5 years. Since then, I have made an effort to reduce the number of times I stop and start mine each day--[reduces the number of heating cycles]. Cant say it has made a difference but if I am going to be stopped for less then 10 minutes [eg fuel, rest stops, etc.], I let it idle.....
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Old 04-06-2014, 10:12 AM   #24
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I've always wondered about the "fast idle" options. There is an idle speed switch on my armrest; and, a smart wheel function that sets the idle at 1000 rpm. Does anyone know if fast idling prevents the engine damage regular idling causes? If not, why are there two options for fast idle for my 2003 ISL 400?
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Originally Posted by Wrinklemeist View Post
Thanks to all for the replies. I can understand the fuel waste and air pollution, but my main concern was with engine damage from "excessive idling". I always try to keep it at under 10 minutes. There were times, while driving through Yellowstone, that animals on the road kept me at a dead crawl for longer than 10 minutes at idle rpm, but that doesn't happen often.
Quote:
Originally Posted by TonyDi View Post
If you have a smart wheel it is most likely part of your cruise control. Turn the cruise on, then quicky tap the accel/resume button twice. Tapping twice again speeds it up further. Tapping the set button twice reverses the process. Turning the cruise off or hitting the brake pedal will return you to slow idle.
At a COLD idle the engine doesn't burn the fuel as complete as it does when warm, This creates more soot and unburned fuel so the faster to warmer temps the better. The less soot and unburned fuel better.
On the dash of the 1999 International School bus I drive it has a sticker on the dash that says to avoid engine damage on a cold start increase Idle speed to a min speed of 1350 RPM.
On that bus it is the Cruise Control buttons that control that idle speed as well.
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