did the high idle mod
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Junior User
Joined: Feb 2004
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did the high idle mod
Yes I finally did the mod thanks to this site,, no upfitters, ran a wire from the lf batt. inside thru the hood latch cable grommet to to a switch connected to the yellow/ grn wire,, put sw. in plastic panel under steering wheel .. works great, will use a lot during summer and any other time during ext. idle situations as trailer hook ups,and when ever..42000 ml,, still love the BEAST
Tuned
Joined: Mar 2004
Posts: 380
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From: somewhere in Colorado
Excuse my ignorance. If I leave mine idling it automatically kicks the idle up after about 2 minutes. So what is the point of the high idle option? Are the RPM's controlable or is it simply factory set and you either switch it on or off? I know these trucks are not suposed to idle long so the only reason I can see it being nice is in real cold temps when you want to keep it running and not ruing the engine/DPF. But then you have the waste of fuel and emissions arguments. So could someone enlighten me?
Post Fiend
Joined: Jan 2009
Posts: 6,521
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From: Greenwood, SC
boulderbronco: The engine idle is elevated when the oil temp is below a certain temp combined with the temp of the ambient air. I don't know the ratio but those two conditions elevate idle automatically and this is what you experience.
When it's warm outside, idle will not elevate automatically. 2 concerns here:
1. High engine load and internal fluid temps, high idle is recommended to keep the fluids hot, keep the oil hot, keep the oil circulating in the turbo housing to cool it effectively, keep the engine block as hot as possible so that fuel economy remains the best it can be, best combustion at highest temps.
2. If you are in a situation where you need to idle for power concerns (electric) or for plain convenience, high idle is recommended to save the EGR system.
It's not a real big deal unless you are one of the unlucky ones that gums up the EGR valve and gets stranded 5 mi. from the nearest road or 500 miles from home at some truck stop. Obviously, it's something that guys make fun of us for too, thinking we are driving "real trucks" where we kick up the idle so we can pretend to be like the Kenworth's and stuff out there. There is a practical reason for it.
When it's warm outside, idle will not elevate automatically. 2 concerns here:
1. High engine load and internal fluid temps, high idle is recommended to keep the fluids hot, keep the oil hot, keep the oil circulating in the turbo housing to cool it effectively, keep the engine block as hot as possible so that fuel economy remains the best it can be, best combustion at highest temps.
2. If you are in a situation where you need to idle for power concerns (electric) or for plain convenience, high idle is recommended to save the EGR system.
It's not a real big deal unless you are one of the unlucky ones that gums up the EGR valve and gets stranded 5 mi. from the nearest road or 500 miles from home at some truck stop. Obviously, it's something that guys make fun of us for too, thinking we are driving "real trucks" where we kick up the idle so we can pretend to be like the Kenworth's and stuff out there. There is a practical reason for it.
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From: Poconos
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thanks 69cj,,I swapped fuse out with a 5 amp..didnt think about the 15 being to high.. still works fine.
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From: Mattawa Washington.
Excuse my ignorance. If I leave mine idling it automatically kicks the idle up after about 2 minutes. So what is the point of the high idle option? Are the RPM's controlable or is it simply factory set and you either switch it on or off? I know these trucks are not suposed to idle long so the only reason I can see it being nice is in real cold temps when you want to keep it running and not ruing the engine/DPF. But then you have the waste of fuel and emissions arguments. So could someone enlighten me?
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swanee
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May 16, 2006 12:34 AM
