Here I am

Long idle periods

Attention: TDR Forum Junkies
To the point: Click this link and check out the Front Page News story(ies) where we are tracking the introduction of the 2025 Ram HD trucks.

Thanks, TDR Staff

Tire pressure

Found 2003 Repo - What's it worth???

Status
Not open for further replies.
Re: Re: Idling

Originally posted by thejeepdude

This isn't really relevant, since a diesel engine idles a lot colder than a gasoline engine. Nice story tho. ;)



Yah, I know. Just thought I'd toss it in. Shows what can happen when you drink too much. Now if that had been a diesel ...
 
extended idle

I idles min all night for 13+ hours on accident once, it scared me to death thinking I messed it up but no long term problems yet. It was around 0 deg. when I did it and it stayed warm all night but it also burned 1/4 tank of fuel!
 
Re: extended idle

Originally posted by Scrappy

I idles min all night for 13+ hours on accident once, it scared me to death thinking I messed it up but no long term problems yet. It was around 0 deg. when I did it and it stayed warm all night but it also burned 1/4 tank of fuel!



Good thing the tank wasnt near empty:p



I woulda just ran it hard afterwards and called it good... MABEY



changed the oil b/c of the 0 Deg temps. :eek:



-Mitch
 
a good friend has a surveying business in central wv and has owned 3 first gens and now 3 second gens and has idled all for hours at a time ...



in the winter for heat they ran pretty much 10 hours a day, not as much in the summer but still 1/2 hour blocks at a time ...



the first gens all lasted 300k+ without so much as a valve adjustment and the second gens were all above 200k this spring with no motor probs or adjustments (lift and vp 44's though)



i treated my first gen better but it idled for an hour probably dozens of times and my second gen stays on all the time running errands ... the tsb is for cold weather ... apparently alot colder then wv
 
Last edited:
In general I'm opposed to long idling periods especially in cold intake air conditioins. But,,,,,,I think that the common rail jobs do have an advantage though; When you think of a normal jerk pump injector and pump arrangement the fuel pressures vary with engine speed and so an idling engine has lower pressures during injection and therefore poorer atomization and vaporization encouraging unburnt fuel to get to the cyl walls. The common rail pressure arrangement is always maintained at the same pressure and so when the injector opens the pressure is already at it's peak and stays that way promoting good combustion. That coupled with a preinjection to get things started should cut back on dilution and washdown.
 
Originally posted by David Oxland

The common rail pressure arrangement is always maintained at the same pressure and so when the injector opens the pressure is already at it's peak and stays that way promoting good combustion. That coupled with a preinjection to get things started should cut back on dilution and washdown.



This isn't true. Fuel pressure is still a function of RPM on the common rail system. At idle I believe it's only 5000 psi. Also, remember that pilot injection uses up some of the available oxygen, leaving less for the main fuel charge, which could result in even more unburnt fuel than in a classic jerk pump arrangement.



I recently bought a BD idle controller for the express purpose of combating the negative effects of a long cold idle. :)
 
Originally posted by rbattelle

Also, remember that pilot injection uses up some of the available oxygen, leaving less for the main fuel charge



You should also remember that the pilot injection heats up the



oxygen available to better burn the main fuel charge. ;):D
 
Is the BD idle controller something that allows you to set high idle AND auto shutdown; or just idle control - is there unit that will do both?



What is cylinder washdown anyway? Is the unburned fuel / cool cylinder 'washing' the lubrication off the cylinder walls thereby causing increased ring wear?
 
Fire trucks have high idle. To help with stuff like things you all are talking about. Put it in N (auto) and adjust the idle higher if you must. Kinda an expensive way to cool the cab.
 
Do I have to have an actual complaint to have the dealer install a patch for TSB 18-004-04, or do I just tell them to re-flash for that service bulletin?



If a complaint is necessary, do I wait until it gets cold again here in N. TX... say, oh around Jan / Feb?
 
Originally posted by CPittman

Do I have to have an actual complaint to have the dealer install a patch for TSB 18-004-04, or do I just tell them to re-flash for that service bulletin?



If a complaint is necessary, do I wait until it gets cold again here in N. TX... say, oh around Jan / Feb?



When I asked my dealer's service writer (Rockwall Dodge) about it, he said "It doesn't get cold enough her to need that". I told him I bought the truck for travel and would eventually find myself "up north" in the winter. They did the TSB, no charge.



Only one thing... make sure to verify it works before you drive away. The tech did the flash, but didn't enable the high-idle feature. I had to go back to have that done. It took about 5 minutes.



The high-idle feature will work regardless of engine or outside temperature. If it doesn't work per the instructions in the TSB, it ain't right.
 
Last edited:
Originally posted by XJSuperman

Should the transmission (auto) be in neutral for extended idling... high or otherwise?

Yes!!!!! the 48re doesn't pump in park, no lubrication, it does pump in nuetral so it's much better to be in nuetral for idling.



I drove and owned big trucks for 15 years before I bought my itty bitty Dodge, most of them are equipped from the factory with a high idle controlled via the cruiz control or set to automatically increase idle to around 1000rpm after a couple minutes of idling, I was told by several mechanics (as has been mentioned here) that if you idle too slow the fuel air mixture will push past the rings and wash the cylinders down with fuel and contaminate the oil.
 
let it run and go by dealer and have high idle put in ecm i forgot the code but you can do search on here had mine done brown dodge in devine tx had not heard of it but gave him the number from here and they did it in a jiffy. also had own big rig for years when we would idle up for cooling or heat at night it would not let oil past turbo seals at least thats what mech told and seemed to work
 
A couple of comments

- just because big rigs do it all the time doesn't mean its good for your engine. Cummins and DC say not to do it, so I don't.

- actual problems are probably only likely with cooler ambient temperatures and low idle speeds.

- cylinder washdown isn't the only issue. extended idling can also cause deposits on the valves seats which can cause the valves to stick, resulting in bent valves. At least, thats' what DC says.





Dave
 
Originally posted by DPelletier



- cylinder washdown isn't the only issue. extended idling can also cause deposits on the valves seats which can cause the valves to stick, resulting in bent valves. At least, thats' what DC says.



This is why Cummins says that if you DO let it idle for extended periods, don't shut it down immediately thereafter. Drive it around a bit and put some load on it to heat things up and burn those deposits off before it cools completely... I'd say this is probably another good reason to use a fuel additive with cleaning agents on a regular basis.
 
Can anyone tell me why we can't get this high idle feature for the 6-speeds??? Does anyone have an alternative to the TSB that would work for manual transmission's?
 
Status
Not open for further replies.
Back
Top