3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

? for guys that idle a lot

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Old 01-12-2008, 05:38 PM
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NICE WORK! JeepMan IOwa.
Old 01-12-2008, 06:43 PM
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It was interesting to find out how much it did take.

I think this summer I will do another test at the higher idle speed settings.

It was a pain to get it completely topped off, especially when it was cold out.

At least if a person gets stranded in a snow storm they will have an educated guess as to how much diesel fuel they may consume if they need to idle their engine for an extended period of time.

Note: at the then current OAT of 27F, my EGT only read approx 200F.

If it hurt my injectors in doing this - no big deal. Just an excuse to upgrade. Life it too short to worry about the small stuff. I'm not ready to get stuffed in a coffin/jar.

Enjoy life - just not at the expense of others.
Old 01-12-2008, 07:37 PM
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Originally Posted by adamkn
Excellent question. Just in case someone here isn't already aware, extended idling is probably the biggest killer of the 3rd gen injectors. Check your operator's manual.


I idle around pastures checking cattle; it may take 30-45 min.s
as well as idle while loading hay onto a flatbed.
I am on my 3rd CTD no injector problems yet.
Old 01-13-2008, 09:01 AM
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nice work! next time it might be nice to try at 1500 rpm, to test the question whether or not our motors actually burn less fuel at a higher idle. while i do agree that letting the motor run for extended periods at IDLE (750) can harm the injectors and other engine components, due to low oil pressures and low coolant temps, 1000, 1250, 1500 rpm is not idle, and critical engine components such as water pump and oil pump will have enough rpm to safely distribute fluids around the block.

back in the day, at harvest time, we would assign a tractor to be hooked to the grain dryer for WEEKS at a time, running WOT 24/7. we would only shut down for an oil change (at hourly intervals)
Old 01-13-2008, 09:11 AM
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Send me a reminder in May or June and I will do a high idle test.
I think using the cruise/high idle it will get close to 1500rpm.

At least in the summer I can drink some cold beer while I'm doing this test for all of mankind.

Later.

Bob
Old 01-13-2008, 09:27 AM
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I did this test also. Filled it to the rim at a flying j and pulled over about 500ft and parked. Got in a nap and 4 hours later I pulled back to the pump and topped off. It took just a hair over 1.2 gallons. I let it idle on its own and the temp was about 15 or so. So it raised and lowered the idle as it needed. So I figure its right at 1/3 of a gallon an hour. Thats a small price to pay for a comfortable nap!
Old 01-13-2008, 10:38 AM
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My 26 hrs was after all 3 generators failed and had to keep the trailer warm in -24 C weather for hunting season. Really didn't have much of a choice at the time and was my last choice, idle or freeze. No apparent ill effects and that was 1 1/2 yrs and 40,000 km ago. My truck cycles the idle up and down quite regularily so I wasn't that concerned.

I don't use additives and only diesel from a reputable, well used stations. We get winter diesel up here after about Nov 1st.

Cya
Old 01-15-2008, 11:40 AM
  #23  
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Originally Posted by JeepManIowa
It was interesting to find out how much it did take.

I think this summer I will do another test at the higher idle speed settings.

It was a pain to get it completely topped off, especially when it was cold out.

At least if a person gets stranded in a snow storm they will have an educated guess as to how much diesel fuel they may consume if they need to idle their engine for an extended period of time.

Note: at the then current OAT of 27F, my EGT only read approx 200F.

If it hurt my injectors in doing this - no big deal. Just an excuse to upgrade. Life it too short to worry about the small stuff. I'm not ready to get stuffed in a coffin/jar.

Enjoy life - just not at the expense of others.
Yeah I'm with you on the "life is too short" thing. It's just something that I hope most people are aware of. Tons of idleing wasn't a problem for older diesels, but most modern diesels are not designed to tolerate that.

Letting it run for 24+ hours strait once in a blue moon probably isn't going to hurt anything - it's when you idle for hours every day that you'll most likely end up with problems.
Old 01-15-2008, 12:16 PM
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What does idling do to the injector, carbon them up?
Does that come off when you get it hot for extended times (towing)
Old 01-15-2008, 02:52 PM
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A few years ago after hurricane Isabelle(?) I fast idled mine while driving a 2KW inverter to power wet vacs and fans to help dry out a marina store. It was summer time and idled about 8 hours. I filled up afterwards and figured out it was approx .3 gallons per hour of fuel consumption.
Old 01-15-2008, 08:15 PM
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How do you adjust the idle speed?
Old 01-15-2008, 08:39 PM
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Originally Posted by hammond
How do you adjust the idle speed?
You need to have your dealer enable the high idle feature on you ECM (Computer)
Old 01-18-2008, 10:50 AM
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Question?

Does your truck ilde at 1100 RPMs? Iv got a 94 ram 2500 w/ 5.9L (no mods except its straight piped) and it idles at around 500 RPMs on start up. Is this normal?
Old 01-18-2008, 03:25 PM
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I used to keep my 97 adjusted to idle between 800-900 rpm.
Will
Old 01-18-2008, 05:30 PM
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Note that when a engine is idling the the valves in head do not rotate,which lead to early valve damage if left idling at long periods of time.


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