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  #1  
Old 01-03-2014, 05:04 PM
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exhaust system regeneration process

My 2014 diesel gc has gone thru the exhaust system regeneration process at least twice and i have less than 1500 miles on the car. Is that a normal interval?

Both times i have been able to continue driving like the Evic message says to do but what happens if someday i am in a position where i have to park and shut off the engine while the regeneration process is going on. Is it bad for the car?

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Old 01-03-2014, 05:33 PM
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Re: exhaust system regeneration process

Regens will vary depending on driving style. If you idle more than average, or do mainly city driving, your vehicle will go through more regens. The "magic" with highway driving and/or towing, is EGTs (exhaust gas temps) are generally higher and can "oxidize" the particulate matter which has been "caught" in the DPF (diesel particulate filter).

IF you get an EVIC message saying your DPF is xx% full, and a regen is necessary, I would drive until the regen is complete.


** As a sidebar, after reviewing the diesel supplement, if the EVIC says Exhaust Filter XX% Full Safely Drive at Highway Speeds to Remedy. I would plan on driving at highway speeds long enough for the regen to be complete.

(**Our GC diesel supplement reads very close to the Ram Cummins supplement. Evidently our vehicles can go through active regen without an EVIC message, and the EVIC only alerts us if the DPF is too full. IF you turn the vehicle off in this situation, it's no problem. This situation occurred on our GC once so far in 2200 miles, and it just smelled funny in the garage.)

So, in summation, if your EVIC says to drive at highway speeds in order for the DPF to regen, I would do that, and I would not cut off the vehicle until the EVIC says you're good to go.


Below is a link to the GC diesel supplement. Click around to get to the 2014 diesel supplement and open up and check it out!


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Old 01-03-2014, 08:00 PM
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Re: exhaust system regeneration process

We have a stupid situation in Australia, firstly, we have never had a Diesel supplement book, even after 3 years of having the CRD.

But worse, is that our EVIC warning for a full or near full DPF, does NOT come on until it is too late.

So this message - Exhaust Filter XX% Full Safely Drive at Highway
Speeds To Remedy
- comes on, and at the same time our cars are put into limp mode, locking it to 4th gear and restricting revs.

Car after car is having to be towed back to dealers because of this stupid programming fault.
Owners are given no guide that this may even happen, or why it happens in our paperwork.
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Old 01-03-2014, 08:51 PM
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Re: exhaust system regeneration process

always beneficial run her WOT a few good times. Rasies EGT clears up left over junk.
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Old 01-06-2014, 01:22 PM
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Re: exhaust system regeneration process

Quote:
Originally Posted by NC4stroker View Post
Regens will vary depending on driving style. If you idle more than average, or do mainly city driving, your vehicle will go through more regens. The "magic" with highway driving and/or towing, is EGTs (exhaust gas temps) are generally higher and can "oxidize" the particulate matter which has been "caught" in the DPF (diesel particulate filter).

IF you get an EVIC message saying your DPF is xx% full, and a regen is necessary, I would drive until the regen is complete.


** As a sidebar, after reviewing the diesel supplement, if the EVIC says Exhaust Filter XX% Full Safely Drive at Highway Speeds to Remedy. I would plan on driving at highway speeds long enough for the regen to be complete.

(**Our GC diesel supplement reads very close to the Ram Cummins supplement. Evidently our vehicles can go through active regen without an EVIC message, and the EVIC only alerts us if the DPF is too full. IF you turn the vehicle off in this situation, it's no problem. This situation occurred on our GC once so far in 2200 miles, and it just smelled funny in the garage.)

So, in summation, if your EVIC says to drive at highway speeds in order for the DPF to regen, I would do that, and I would not cut off the vehicle until the EVIC says you're good to go.


Below is a link to the GC diesel supplement. Click around to get to the 2014 diesel supplement and open up and check it out!


Jeep Owners | Download an Owners Manual 2004 - 2011 | Jeep

I'm relatively new to the diesel world - but if I am about to pull into my parking garage downtown at work, and evic tells me I need regen, I should go drive on the freeway and not shut off the jeep? That seems completely asinine and impractical.
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Old 01-06-2014, 01:26 PM
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Re: exhaust system regeneration process

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Originally Posted by wraab View Post
I'm relatively new to the diesel world - but if I am about to pull into my parking garage downtown at work, and evic tells me I need regen, I should go drive on the freeway and not shut off the jeep? That seems completely asinine and impractical.
It should be fine, as it will just regen the next time you turn it on.
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Old 01-06-2014, 01:38 PM
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Re: exhaust system regeneration process

OPERATION

The oxidation catalysts raise the exhaust gas temperatures to regenerate the DPF , which is passive regeneration. If the passive regeneration cannot keep up with the build up of soot in the DPF, the Powertrain Control Module (PCM) will actively regenerate the DPF to burn off the soot. Residue remains inside the DPF in the form of non burnable ash. Ash comes from the oils and other materials that are trapped in the oils and are present in the soot. Ash is not eliminated by the regeneration cycle. Excessive ash accumulation requires the replacement of the DPF. The DPF uses a silicon carbide wall-flow monolith with a platinum coating to trap particulates. The monolith contains a large number of square parallel channels, which run in the axial direction and are separated by thin porous walls. The channels are alternatively open at one end, but plugged at the other. The exhaust gases flow through the walls and escape through the pores in the wall material. Particulates, however, are too large to escape and are trapped in the monolith walls. The PCM starts the regeneration of the DPF if the soot load exceeds a performance map value. The PCM determines the load condition of the DPF based upon the exhaust gas pressure upstream and downstream of the DPF. A pressure differential sensor provides the pressure input to the PCM. During the regeneration process, the PCM raises the temperature in the DPF to burn off the soot accumulated. Under normal operation, the engine does not produce enough heat to oxidize the soot inside the DPF. This process requires temperatures above 550 C (1,022 F). After regeneration, the PCM reads the actual pressure difference at the DPF and compares it with a reference value. From this comparison, the PCM determines the ash quantity inside the DPF.
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Old 01-06-2014, 03:03 PM
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Re: exhaust system regeneration process

the previous generation WK CRD performed the DPF regeneration every 730 miles on average.
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Old 01-06-2014, 07:53 PM
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Re: exhaust system regeneration process

Quote:
Originally Posted by wraab View Post
I'm relatively new to the diesel world - but if I am about to pull into my parking garage downtown at work, and evic tells me I need regen, I should go drive on the freeway and not shut off the jeep? That seems completely asinine and impractical.
Like Shannon said, I'd just park it, and plan on getting in some freeway time on the way home!
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Old 01-06-2014, 09:03 PM
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Re: exhaust system regeneration process

thanks all!
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Old 01-06-2014, 09:08 PM
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Re: exhaust system regeneration process

Quote:
Originally Posted by wraab View Post
I'm relatively new to the diesel world - but if I am about to pull into my parking garage downtown at work, and evic tells me I need regen, I should go drive on the freeway and not shut off the jeep? That seems completely asinine and impractical.
Don't be angry by this response. The DPF needs to regen or it will eventually clog. If you didn't do the research before buying then the dealer should have explained it. You should not keep the vehicle if you have a problem with the emission control system.

Modern (2007 and newer) diesel engine emission systems in passenger vehicles are more complex in my opinion than gas engine emission systems. EGR, CCV, DPF, DEF, turbo, glow plugs, intercooler components are all involved with your diesel engine combustion and emission systems that you should be familiar with if you want to have trouble free ownership.
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Old 01-12-2014, 12:34 PM
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Re: exhaust system regeneration process

When I was out in the boondocks four-wheeling the other day, it occurred to me that I am doing lots of idling and very, very slow driving. What would I do if it said it needed regeneration? I was a couple hours from a highway.
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