idiling the 6.7l motor

[GTarantino]

hi guys how are you? i have a question for all of you. . how long can you leave this 6. 7l motor idling for? do you think it will cause problems if you left it idling for a half hour - hour in a parking lot with the a/c running? thanks garett

 

[Simplysmn]

You would not think it would hurt it with air going to clutch on compressor is going to be cycling on and off so engine load will change . our engines are just like any other . If in fact that does hurt it then I would be looking into a reason why it would . the big rigs idle for hours at a time with no problem's .

Just my 2 cent's .

 

[2Rowdy]

Service writer told me excessive idling will cause the dpf to plug. Guess who gets to say what is excessive. I use the high idle feature when I idle for more than just a few minutes. The computer does not consider 1100 rpms or higher idling(according to service writer). Supposedly to much idling is reason enough to deny warranty.

 

[courierdog]

My next door neighbour is a Heavy Duty Mechanic running his new 6. 7 L C&C and his truck runs from the time he starts at 0430 to 2130 when he returns home so far no error messages the truck has to idle while he is on a job site as it runs the air compressor.
We share our experiences both of us are happy with our respective trucks.
I spoke with my Service Manager and those of us who run as Fleet Operators be it a fleet of one or one hundred the warranty is based on the milage which in my case while EXTENDED will expire well within one year.
The usage is declared up front and is defined in our contract as valid use of the vehicle.

 

[HLewallen]

I would be careful using opinions on this subject, as there seem to be many contradicting ones. The opinions I tend to believe (including one from an ex-Cummins and a current Cummins engineer) say idling these engines is indeed bad. These engines are not like "others" - they are brand new stuff as far as fuel delivery and emissions. I was told actual Cummins controllers (computers) have very advanced "high idle" type control with many different settings to keep these engines from spending too much time at idle. I would do more research - and look into a good remote start system so you can start it and give it just enough time to cool off (if that is what you are trying to accomplish).

 

[Wolfy]

our engines are just like any other . If in fact that does hurt it then I would be looking into a reason why it would.

The reason is the emissions- control system with the diesel particulate filter, its accompanying regeneration requirements, and the potential for clogging.



Nope, "our engines" (do you have one?) are NOT "just like any other".



Reading the "Understanding Regeneration" thread can help with looking for reasons.

 

[courierdog]

Again I will state regardless of what a closet engineer (some engineers never see the light of day) says the real world IS there are trucks which do in fact run all day, where some portion in in a static state (not moving) Farm Vehicles, Service/MTCE Vehicles, Courier/Hot Shot Vehicles. Making a general statement for Poor Engineered Design is not acceptable, I spent 42 years as an Engineer which most of it was in a management position and the REAL WORLD must be factored in or the bridge will collapse (pun intended) Yes many of us have a cab heater installed s we do not run the engines unless actually needed but AGAIN get real those of us who live north of the 49 parallel have REAL winter where the engine is going to run in some circumstances 7/24 get over the narrow minded attitude that the anti-polution equipment is not designed for it. Then go back to the drawing board and get the design right so those of us who have to operate in the REAL WORLD can run our trucks without fear of the Damage to the Engine/anti-polution equipment or some warranty cost accountant having a hissy fit.
These are WORKING TRUCKS not play toys for running to the store and back.
I do not start my truck unless it is for the express purpose of making money. I work after hours, year round and in all weather, when all day time operators have gone home for the day.

 

[MDoyle]

Service writer told me excessive idling will cause the dpf to plug. Guess who gets to say what is excessive. I use the high idle feature when I idle for more than just a few minutes. The computer does not consider 1100 rpms or higher idling(according to service writer). Supposedly to much idling is reason enough to deny warranty.

The Dodge Rodeo promo guys travel to and set up displays at many of the larger rodeos. During our Prescott Frontier Days week ('the world's oldest rodeo'), one of the rep's told me he had, at that time, about the highest mileage '07. 5, 6. 7L in the country, due to pulling the transporter trailer to all the rodeo towns and then using the truck for local transportation. He was very serious when advising me not to idle mine more than neccessary. He said IF IT WAS NECCESSARY, then use the high idle (PTO) feature, and select 1500 or so rpm. Yesterday, I had my dealer activate this feature - selected by being in park (68rfe), then selecting cruise control while tabbing the accel pad. It would only go up to 1100 rpm. THIS IS MY QUESTION; is 1100 and no higher, the only rpm available with this feature? Have many of you folks had experience with this mode?
The Dodge Rodeo rep. also said he had gotten the '80%, then 90% full' message one one occasion when doing around town driving for a week in a rodeo town. He drove to the highway and up to 65mph. The message counted down to 'zero % full', in 22 minutes.
Love to learn more about the PTO/HI IDLE operation.
Thanks. This is a great forum.

 

[2Rowdy]

Mine will idle up to 1500 rpms(from 1100) in 100 rpm increments by pressing the accel button. MDoyle please fill out your sig so we know what you have.

 

[TKeeler]

Mine will idle up to 1500 rpms(from 1100) in 100 rpm increments by pressing the accel button. MDoyle please fill out your sig so we know what you have.

Ditto... mine works the same way.

 

[MDoyle]

Mine will idle up to 1500 rpms(from 1100) in 100 rpm increments by pressing the accel button. MDoyle please fill out your sig so we know what you have.

You're going to laugh - or roll your eyes... I just know it.
I don't know how.

 

[2Rowdy]

Go to the top of the page under discussion forums it will pull down, then go to user control panel. Then fill out signature.

 

[MDoyle]

Go to the top of the page under discussion forums it will pull down, then go to user control panel. Then fill out signature.

Thanks. I just did. You probably figured out I don't make my living with computers...

 

[tom sweeney]

i too would like to know more about the "hi-idle" feature... . i haven't installed gauges as yet... ... tom

 

[courierdog]

Originally Posted by MDoyle
"The Dodge Rodeo rep. also said he had gotten the '80%, then 90% full' message one one occasion when doing around town driving for a week in a rodeo town. He drove to the highway and up to 65mph. The message counted down to 'zero % full', in 22 minutes. "

I suggest he must have some special feature or device to read the Active Regeneration operation, or he has some feature enabled the rest of us mortals wish we had. Please explain
IF we mere mortals had a means to read the Active Regeneration operation it would answer many questions and prevent a lot of misinformation regarding the "Regen" issue.

 

[dnesbitt3]

while having my truck serviced there was a C&C set up with a sleeper. Used for delivering campers around the country. Had about 30K on it and had been in the shop 6 time for plugged DPF. Dodge and the dealer was giving the guy a really hard time about idling the truck (computer readout shows how many hours at what RPM's) According to their printout the owner idles the truck nearly 30% of the time (i'm sure to run the A/C while he's sleeping). Don't know what the final resolution was... . Kept me from looking at a new truck though...

 

[Shadrach]

An aquainance of mine is a welder on a pipeline job. He was asking me about how the 6. 7 would work in his job. What they do is leave the truck running all day. The weld two pipes together then "drive" the truck ahead to the next joint , maybe 50', then weld and so on. it doesn't take long to weld a pipe, even if it is, say, 24" or so in diameter. Any ideas on how to get around this with an 07? Shadrach

 

[TKeeler]

Originally Posted by MDoyle

"The Dodge Rodeo rep. also said he had gotten the '80%, then 90% full' message one one occasion when doing around town driving for a week in a rodeo town. He drove to the highway and up to 65mph. The message counted down to 'zero % full', in 22 minutes. "



I suggest he must have some special feature or device to read the Active Regeneration operation, or he has some feature enabled the rest of us mortals wish we had. Please explain

IF we mere mortals had a means to read the Active Regeneration operation it would answer many questions and prevent a lot of misinformation regarding the "Regen" issue.

I have a Dashhawk and it will display seven or eight different PID's for 'Regen' from the OBDII port. I watch two of them all the time, one is 'Regen Filter' and another is 'Regen Trigger'. The 'Regen Filter' number slowly goes up until it reaches the 'Regen Trigger' number, in my case its 4. 5. It will then under the right conditions (still don't know what those are) go into Regen and the 'Regen Filter' number slowly counts down to I would assume zero but the lowest I have seen is 2. 7. Once the Regen stops it will then count back up as you drive to the 4. 5 'Regen Trigger' and cycle again. I have yet to see it go past the 4. 5 number but would assume that eventually I would see the 80%, 90% full warnings mentioned above.

 

[AHarris]

This might be a dumb question

Do all 6. 7L trucks have the high idle feature or do you have to order it as an option?

 

[courierdog]

I am told by my Service Manager, ALL 6. 7 come with the high idle feature, BUT, it has to be enabled (Turned On) by the dealer. Once turned on, while in park, press the set for more than one second and the idle will go to 1100 rpm and it your then press accel it will increase the rpm. My HD mechanic next door uses this feature all day to operate the air compressor while he works. His truck is in idle (high) most of the day and his stack is clean as the day he brought it home, no CEL, no DPF messages.