6.7L Cummins Forum

Squid · #1 (**permalink**) 04-08-2008, 08:20 PM

Since I installed my Edge juice with Attitude on my 6.7L Cummins one of the things I get told is when the computer runs a DPF regeneration by an audio alarm and a visual Que. Since I drive the same 100 miles or so 6 nights a week I noticed the last two nights that it performs a regeneration twice and pretty much at the same location with the regeneration lasting 7 minutes.

Now what I find interesting about this is that I'd say that 75% of my driving is 60 to 70 MPH, I run the exhaust brake on the highway and since it's after midnight even the in town driving I'm doing 40 MPH and I seldom if ever have to stop for lights. I do make 7 to 10 stops a night to check job sites but I don't leave the truck running which has got me thinking.

What about the guy who buys the 6.7L to tow their 5th wheel with only on the weekends every now and then and two weeks a year for vacation and drives it the rest of the time to work and back in town 10 or 15 miles a day? There's no way he'll be on the road long enough to do a full regeneration if I'm doing two a night at 7 minutes each. I know there's suppose to be a warning before the DPF gets clogged but so far no one I've run into has seen it yet. Makes me wonder if there won't be a redesign/recall down the road for the DPF when the weekend warriors get a hold of these trucks?

Just an observation and I was wondering what you guys thought? I'll see if this pattern persist and let you know.

Per the Manual:

Quote:

Intervention Regeneration Strategy – EVIC
Message Process Flow (Catalyst Full Message)
(6.7L Diesel Engines Only)

Your new Cummins 6.7L diesel meets all EPA Heavy
Duty Diesel Engine Emissions Standards, resulting in the
lowest emitting diesel engine ever produced.
To achieve these emission standards your vehicle is
equipped with state of the art engine and exhaust system.
The engine and exhaust aftertreatment system work
together to achieve the EPA Heavy Duty Diesel Engine
Emissions Standards. These systems are seamlessly integrated
into your vehicle and managed by the Cummins
6.7L engine Powertrain Control Module (PCM). The PCM
manages engine combustion to allow the exhaust system’s
catalyst to trap and burn Particulate Matter (PM)
pollutants, with no input or interaction on your part.
Additionally, the overhead console in your vehicle has
the ability to alert you to additional maintenance required
on your truck or engine. Refer to the following
messages that may be displayed on your Electronic
Vehicle Information Center (EVIC):

WARNING!
A hot exhaust system can start a fire if you park over
materials that can burn. Such materials might be
grass or leaves coming into contact with your exhaust
system. Do not park or operate your vehicle in areas
where your exhaust system can contact anything that
can burn.

Perform Service
The 6.7L Cummins engine utilizes a Closed Crankcase
Ventilation (CCV) system, EGR Valve and a EGR Cooler.
This system filters and recycles gasses produced in the
crankcase during the normal combustion process. Perform
Service will be displayed on the overhead console of
your vehicle if the CCV filter, EGR Valve and EGR Cooler
is due for required maintenance. The CCV filter is located
on the top of the engine valve cover. For additional
information, see your local authorized dealer.
Catalyst Full See Owner Manual
Catalyst Full See Owner Manual will be displayed on the
overhead console of your vehicle if the exhaust particulate
filter reaches 80% of its maximum storage capacity.
Under conditions of exclusive short duration and low
speed driving cycles, your Cummins engine and exhaust
aftertreatment system may never reach the conditions
required to remove the trapped PM, if this occurs Catalyst
Full See Owner Manual will be displayed on the
overhead console in your vehicle. If this message is
displayed you will hear one chime to assist in alerting
you of this condition.
Catalyst Stat::::::::::80%
Catalyst Stat::::::::::80% will replace the message Catalyst
Full See Owner Manual after it is displayed for one
minute. The engine Powertrain Control Module (PCM)
will continue to monitor the amount of particulate matter
trapped in the particulate filter. This message indicates
the percentage of the particulate filter capacity that has
been used.

By simply driving your vehicle at highway speeds for as
little as 45 minutes you can remedy the condition in the
particulate filter system and allow your Cummins engine
and exhaust Aftertreatment system to remove the
trapped PM and restore the system to normal operating
condition.
Catalyst Stat:::::::::::80%, 90%, 99%
Catalyst Stat:::::::::::80%, 90%, 99% If you are unable to
drive your vehicle under these conditions for an extended
period of time after the initial warning notification,
the Engine PCM will continue to monitor the
particulate filter and will display the progression of
particulate filter usage (80, 90, 99%) on the EVIC message
center.

CATALYST FULL SERVICE REQD
If the particulate filter reaches 99% of it’s capacity the
overhead console in your vehicle will chime twice and
display the message CATALYST FULL SERVICE REQD.
At this point the engine PCM will register a fault code,
the instrument panel will display a MIL light and the
engine PCM will derate the truck reducing its horsepower
and torque output.
The PCM derates the engine in order to limit the likelihood
of permanent damage to the aftertreatment system.
If this condition is not corrected and a dealer service is
not performed, extensive exhaust aftertreatment damage
can occur. In order to correct this condition it will be
necessary to have the truck serviced by your local
authorized dealer.

Garlic · #2 (**permalink**) 04-11-2008, 02:24 PM

I've had the 'CAT 80% full" buzzer (Dinger) go off on me 1 time. Took it for a blast up the freeway at 70 or so in 4th for about 25 miles and it turned off the message. It occured after a long week of slow speed driving and way too much idle time. YES The exhaust gets VERY HOT!! It will do an auto idle up when it idles for more than 3 or 4 minutes in Park, touch the brake and it returns to normal. I have yet to see where the EVIC tells me that it is in Regen. Someone told me just watch the fuel mileage, I really can't tell because I use the mileage minder over a 1500 mile reset period (Usually). Long term averages are pretty close on mine. After reset it is way off. I don't know if I am going to put on a monitor or just a couple of gauges yet, I guess the pyro would tell you if you were in regen though. My commute is 15 miles each way every day with trip interuptions in the afternoon, we also take it out for a tow every month usually 50 to 150 miles (It's all up hill out of Albuquerque). So far no real issues with the truck.

Squid · #3 (**permalink**) 04-11-2008, 07:07 PM

At least the 80% warning does work because I've never seen a warning on the overhead about a Regen and the Dodge Service manager was just as lost as I about there even being one? I'm still getting at least one Regen every night with the one last night lasting over 14 minutes.

Now I'd like to know how much fuel is used to do this?

Garlic · #4 (**permalink**) 04-12-2008, 07:16 AM

Me too. What temps are you running when it goes into Regen? I saw that your pyro is pre turbo.

Vis-a'-vis · #5 (**permalink**) 04-13-2008, 12:24 PM

Squid, you were describing me. I had to change my route because I was in constant regen. I only tow my 5th wheel 2 to 3 times per month. Stop and go driving is a killer on this truck. I now drive about 12 miles one way to my shop with only 2 stop signs along the way. I've found ( for my duty cycle) that the right fuel makes a big difference in #'s of regens. This truck is my daily driver.

Pa Bird Man · #6 (**permalink**) 05-04-2008, 10:24 PM

Just trying to understand this a little better, the only way you know you're doing a regen is if you've got an aftermarket tuner installed? There's nothing on the EVIC telling you this right? I just got back from a 220 mile trip pulling the 18ft trailer hauling about 8,000lb up and down some mountians, and had my foot into it pretty good, that should have cleaned my DPF out real good.

Squid · #7 (**permalink**) 05-05-2008, 05:25 PM

That's correct. Unless you haven't allowed your truck to regenerate due to a lot of short in town driving trips you'll never know except maybe by the decrease in MPG. This disturbed me to no end. This is a very important process that needs to take place and to not allow us to know when and if it's being done makes no sense. But lordy, lordy, they sure know how to remind you to change your oil.

Vis-a'-vis · #8 (**permalink**) 05-05-2008, 07:58 PM

Quote:

Originally Posted by Squid

That's correct. Unless you haven't allowed your truck to regenerate due to a lot of short in town driving trips you'll never know except maybe by the decrease in MPG. This disturbed me to no end. This is a very important process that needs to take place and to not allow us to know when and if it's being done makes no sense. But lordy, lordy, they sure know how to remind you to change your oil.

Amen to that! I would recommend everyone that has a 6.7 to get a EGT and Boost gauge. You need to know what is going on!!

Squid · #9 (**permalink**) 05-19-2008, 05:12 PM

So a member here said that the Tech at the dealership told him to help reduce the amount of regenerations the exhaust brake should be run 70% of the time on the 6.7L. So I gave it a try and for the last 357 miles if the truck was running the exhaust brake was on and here's my findings.

Quote:

I still had 2 regenerations a night.

MPG dropped from 17.5 to 16.8.

I'll be going back to less use of the exhaust brake.

Vis-a'-vis · #10 (**permalink**) 05-19-2008, 09:06 PM

Quote:

Originally Posted by Squid

So a member here said that the Tech at the dealership told him to help reduce the amount of regenerations the exhaust brake should be run 70% of the time on the 6.7L. So I gave it a try and for the last 357 miles if the truck was running the exhaust brake was on and here's my findings.

I'll be going back to less use of the exhaust brake.

Keeping the EB on is mainly to keep your turbo vanes exercised. Note the boost when you let off of the fuel. Regen reduces when you defuel with or without the EB.

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