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  #37  
Old 03-04-2014, 08:31 PM
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Quote:
Originally Posted by iboughtajeep View Post
Has anyone tried a fast idle say 2000rpm for 15 min to see if it starts a regen?
An interesting point to ask. Does it also require additional fuel injection downstream? What temperature burns the DPF clean without any ECU intervention?

It'd be great if we could get some hard data on exactly how the Jeep's DPF system functions. I know if I experience a limp home event, I'll be leaving the dealer with that information... or I'll be back the next day to park outside and meet the nice people visiting

Maybe I need to get into the service pit and poke around the exhaust system a bit? If there are sensors, they are probably analogue which means they should be able to be measured.

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  #38  
Old 03-04-2014, 09:39 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Here are some comments from sox in the other sub forum, seems to be from a manual:

Quote:
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.
exhaust system regeneration process

It seems that the exhaust can't get this hot without the ECU going into regen mode and doing the post injection and pumping in some NOx gas. But it does get hot enough under normal running conditions to burn off 'some' of the trapped material. So giving a boot full in N might help that, but it won't allow the ECU to go into regen mode and increase the temps to 550.
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  #39  
Old 03-04-2014, 09:44 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Oh and another variation from earlier in the thread:

Quote:
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 pores in the wall material. Particulates, however, are to large to escape and are trapped in the monolith walls. The ECM starts the regeneration of the DPF if the soot load exceeds a performance map value. The ECM determines the load condition of the DPF. A pressure differential sensor provides the pressure input to the ECM. During the regeneration process, the ECM 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 1022 fahrenheit. The ECM activates the following inputs to generate more heat and increase the exhaust gas temperature:
- EGR throttle valve
- Injectors for post injection
- Glow plugs

The ECM uses the DPF differential pressure sensor along with many other inputs to monitor the state of the exhaust emmission system. The (ECM) will set DTCs and may illuminate the MIL to alert the driver of faults within the system.
That one is from a chrysler 300c forum.
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  #40  
Old 03-05-2014, 02:11 AM
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Quote:
Originally Posted by Benn0 View Post
Here are some comments from sox in the other sub forum, seems to be from a manual:

exhaust system regeneration process

It seems that the exhaust can't get this hot without the ECU going into regen mode and doing the post injection and pumping in some NOx gas. But it does get hot enough under normal running conditions to burn off 'some' of the trapped material. So giving a boot full in N might help that, but it won't allow the ECU to go into regen mode and increase the temps to 550.
I remember in my youth, modifying v8's, the run in procedure to harden the lobes on a new cam was a 20min fast idle. It would get the headers hot enough that they would glow red. Im pretty sure that would be around if not above the 550 mark.
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  #41  
Old 03-07-2014, 07:58 PM
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Re: Is DPF issue for 2014 CRD fixed now?

G'day guys,

You can add my My14 GC Limited Diesel to this problem. Last night at about 1am it decided to go into limp mode, stuck in 4th gear and max 3000rpm. It said that Exhaust Filter is 100%. Drive at highway speeds to remedy. I did this on the freeway for 30 mins at 3000rpm non stop and it didn't fix anything.
It was only 19c temp last night, so I'm going to give it another go today, however driving on the freeway at only 75km/h is quite dangerous with everybody flying around you at 110+.
Is there any way to force the regeneration process?
I do mainly city driving and occasionally a few times a month give it a run along the freeway for about 60k. But mostly driven in afternoon after work.
Very disappointing.

Any info on anything i can do other than taking to the dealership would be great.

Thanks
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  #42  
Old 03-07-2014, 08:03 PM
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Re: Is DPF issue for 2014 CRD fixed now?



.......... how can I confidently buy a CRD Jeep with this (above post) happening?
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  #43  
Old 03-07-2014, 08:09 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Marty K View Post


.......... how can I confidently buy a CRD Jeep with this (above post) happening?
I must add though Marty K, that other than this being my first major fault which has affected the actual driving of the car, it has been a absolute fantastic car to drive. Very smooth, economical, quiet, and very responsive. I do love this car, but of course still being reasonably new for this to happen has obviously pissed me off.
I was actually planning on going 4wd on the sand today, so I'm actually happy that it happened to me last night on the way home from friends place, otherwise I would have been stuck on the beach.
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  #44  
Old 03-07-2014, 09:46 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by fforacing View Post
G'day guys,

You can add my My14 GC Limited Diesel to this problem. Last night at about 1am it decided to go into limp mode, stuck in 4th gear and max 3000rpm. It said that Exhaust Filter is 100%. Drive at highway speeds to remedy. I did this on the freeway for 30 mins at 3000rpm non stop and it didn't fix anything.
It was only 19c temp last night, so I'm going to give it another go today, however driving on the freeway at only 75km/h is quite dangerous with everybody flying around you at 110+.
Is there any way to force the regeneration process?
I do mainly city driving and occasionally a few times a month give it a run along the freeway for about 60k. But mostly driven in afternoon after work.
Very disappointing.

Any info on anything i can do other than taking to the dealership would be great.

Thanks
You need to take it to a service center for them to trigger the regen. There was a report that someone in the US was able to drive it in limp mode until it cleared, but I wouldn't try that.

What is your build date? How many kms are on the clock?
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  #45  
Old 03-07-2014, 09:47 PM
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Re: Is DPF issue for 2014 CRD fixed now?

I will be buying a Jeep Grand Cherokee, but I've never owned a Diesel before so these DPF instances are scaring me off.

Being an ex-WJ V8 Limited owner I know how great these cars are. I really want the torque and fuel economy of the CRD,..but...........
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  #46  
Old 03-07-2014, 10:01 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Marty K View Post
I will be buying a Jeep Grand Cherokee, but I've never owned a Diesel before so these DPF instances are scaring me off.

Being an ex-WJ V8 Limited owner I know how great these cars are. I really want the torque and fuel economy of the CRD,..but...........
HAVE FAITH JEEP WILL FIX IT BUT IT MAKE TAKE A WHILE - I HAD THE NO START/RUN ISSUE EARLY ON AND THEY CAME UP WITH A FLSH FAIRLY QUICKLY BUT I DO MISS THE BURRBLE OF MY OLD WJ AS WELL!
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  #47  
Old 03-07-2014, 10:03 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Sege View Post
HAVE FAITH JEEP WILL FIX IT BUT IT MAKE TAKE A WHILE - I HAD THE NO START/RUN ISSUE EARLY ON AND THEY CAME UP WITH A FLSH FAIRLY QUICKLY BUT I DO MISS THE BURRBLE OF MY OLD WJ AS WELL!
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  #48  
Old 03-07-2014, 10:08 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Yes, this seems to be a growing problem, particularly for the MY14, Jeep will have to put more effort into coming up with a fix.
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