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  #10201  
Old 03-09-2014, 05:07 PM
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Re: 2014 Grand Cherokee information - Australia

Barry, I think you have made a mistake and given JeepAU the easy way out.
You would have been entitled to a full refund on your car, so I surely hope you did not lose out on the deal. Changing from CRD to Petrol will result in lower resale down the track (I could be wrong if they do not fix the DFP problem) and will also not tow the van as well as a Diesel.
I am glad it is sorted out, but I feel you may have got the short end of the stick.

As for the bad DFP "assembly" being blamed in cooke's post, it could be some truth in it, as they are generally made to the lowest cost by the least skilled workers (Mexico or China) and they can get it very wrong when quality control is not in place.
Think about one worker in a production line of 20 who is consistently putting a part the wrong way round and nobody checking it. There you have a 5% failure rate that may only be evident after the DFP's fail to regen because of this error. It can take months for this problem to show itself.
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  #10202  
Old 03-09-2014, 06:16 PM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by webber View Post
Ok, I'm a bit of a mechanical dumbo so cannot use any mechanical knowledge to pass judgement but I can, at the very least, apply practability/logic. I am having trouble understanding why this "DPF" thingie causes some owners so much grief. I would have thought this DPF device would be manufactured enmasse by machines and each DPF should be identical, which is how most things are when they come off the end of machines. I am then concluding that when this car is assembled the DPF is bolted or connected up in some way or another. So if these things are identical and then fitted I am concluding that other matters are at play here. We have some observations that it is caused by some drivers not doing sufficient kilometres at high enough speeds on the highway to burn it off. But is it something else or does it simply come down to some DPF's coming off the assembly line faulty?
Now SJandL did try and find out the extent of the problem a week or two ago by asking those with problems to list themselves to gauge the size of the problem. SJandL KICKED IT OFF by listing, I think, 3 names she could think of. Unfortunately she got little response but I did think it a worthy attempt.
Anyway, I am concluding that the problem has probably "blown out of disproportion" on this site because the poor buggers affected have raised the issue many times on this site and anyone reading this forum, unless they are noting the identities of those with troubles could be forgiven for thinking it is far worse than actually is.
I'm not a mechanic either, but I've done a bit of research, and also researched the Nissan problems with their pathfinder dpfs when I was looking at buying one of those. In this case there seem to be a few links that could have a problem.

There is the software that decides when to do a burn. I'd expect that is pretty much identical across the builds, maybe it changed for the MY14, and makes it more susceptible to other problems?

There are the sensors that may not be picking up a blockage, or may be picking up a blockage that actually doesn't exist. Ordinarily it should pick up that air pressure is increasing on the input side of the dpf and the ECU triggers a burn, maybe the sensors are faulty or not sensitive to pick up the slight increases in pressure, and are only picking up a change when at pressure changes that exceed the threshold for limp mode?

Perhaps the filter itself is poorly built and isn't allowing burnt off ash to fall out of the filter?

Perhaps there is a fuel issue that is creating excessive soot, not allowing the burn off to occur in time before it fully blocks the filter (I find this unlikely). Or maybe there is a treatment they are applying to the inside of the exhaust during build that then moves to the dpf and blocks it, might explain the low km dpf alerts. But doesn't explain why a burn at the dealer clears it.

The really unusual events are when the driver is being alerted to a full dpf and told to drive at highway speeds, and they do as instructed, yet regen doesn't trigger. The ECU can obviously see that the dpf is full, the sensors must be working, and the speed is high enough to trigger a burn, but it doesn't enter regen. There must be another parameter the ECU is waiting on to trigger a burn. Perhaps the software is faulty and in some cases is expecting a condition that isn't met.

Anyway, as SJandL said we have a dedicated thread on it now, where we have collated some info:

Is DPF issue for 2014 CRD fixed now?

I'll add chooke's latest update to that thread.
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  #10203  
Old 03-09-2014, 07:18 PM
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Re: 2014 Grand Cherokee information - Australia

After trolling thru these pages and discussing service costs with my local dealer, plus the apparent attitude of Jeep Aust towards their customers, I have decided the Jeep might not be worth the trouble, I realize there must be some happy Jeep owners out there but for the price we pay I simply expect a vehicle plus backup service that may be beyond Jeep.. pity really as I was quite keen but it looks like I stick with Nissan, 5 years and no problems plus cheaper to service !
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  #10204  
Old 03-09-2014, 08:41 PM
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Quote:
Originally Posted by mickd View Post
After trolling thru these pages and discussing service costs with my local dealer, plus the apparent attitude of Jeep Aust towards their customers, I have decided the Jeep might not be worth the trouble, I realize there must be some happy Jeep owners out there but for the price we pay I simply expect a vehicle plus backup service that may be beyond Jeep.. pity really as I was quite keen but it looks like I stick with Nissan, 5 years and no problems plus cheaper to service !
Tend to agree and if i can afford it am thinking of going back to the nissan patrol
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  #10205  
Old 03-10-2014, 01:54 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Benn0 View Post
I'm not a mechanic either, but I've done a bit of research, and also researched the Nissan problems with their pathfinder dpfs when I was looking at buying one of those. In this case there seem to be a few links that could have a problem.

There is the software that decides when to do a burn. I'd expect that is pretty much identical across the builds, maybe it changed for the MY14, and makes it more susceptible to other problems?

There are the sensors that may not be picking up a blockage, or may be picking up a blockage that actually doesn't exist. Ordinarily it should pick up that air pressure is increasing on the input side of the dpf and the ECU triggers a burn, maybe the sensors are faulty or not sensitive to pick up the slight increases in pressure, and are only picking up a change when at pressure changes that exceed the threshold for limp mode?

Perhaps the filter itself is poorly built and isn't allowing burnt off ash to fall out of the filter?

Perhaps there is a fuel issue that is creating excessive soot, not allowing the burn off to occur in time before it fully blocks the filter (I find this unlikely). Or maybe there is a treatment they are applying to the inside of the exhaust during build that then moves to the dpf and blocks it, might explain the low km dpf alerts. But doesn't explain why a burn at the dealer clears it.

The really unusual events are when the driver is being alerted to a full dpf and told to drive at highway speeds, and they do as instructed, yet regen doesn't trigger. The ECU can obviously see that the dpf is full, the sensors must be working, and the speed is high enough to trigger a burn, but it doesn't enter regen. There must be another parameter the ECU is waiting on to trigger a burn. Perhaps the software is faulty and in some cases is expecting a condition that isn't met.

Anyway, as SJandL said we have a dedicated thread on it now, where we have collated some info:

Is DPF issue for 2014 CRD fixed now?

I'll add chooke's latest update to that thread.
Talking to a mate who has a Ford Mondeo Diesel and guess what they have the same problem.
He has to take it for a burn down the highway about once a fortnight to clear it as the car is used mainly in the city i.e. short trips.
So it is not only a Jeep problem!!
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  #10206  
Old 03-10-2014, 02:25 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by foglamp View Post
Talking to a mate who has a Ford Mondeo Diesel and guess what they have the same problem.
He has to take it for a burn down the highway about once a fortnight to clear it as the car is used mainly in the city i.e. short trips.
So it is not only a Jeep problem!!
As do the Mazda's and the Subaru's from what I am reading on the net. I also don't think the issue is limited to the Jeep brand.

I may or may not have experienced some sort of regen today but am unsure - shall post symptoms on the DPF thread but in the meantime, I've wanted to ask this question for a while...

WEBBER - How is your VR with regard to your music now? Or are you still only able to call up Elvis?

I've been wanting to ask you that for ages.
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  #10207  
Old 03-10-2014, 02:32 AM
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Getting my CRD serviced on Wednesday they quoted $450 does this sound about right? I'm going to ask them to try and reverse it using only the reverse camera so they understand the frustrations. Being old school I only use it for kids ect but the missus is all over me to get it fixed as she can't see anything at night and just during the day. Feedback on service price would be great.
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  #10208  
Old 03-10-2014, 02:36 AM
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Re: 2014 Grand Cherokee information - Australia

What service is it? How many kms/months?
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  #10209  
Old 03-10-2014, 02:41 AM
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Quote:
Originally Posted by foglamp View Post
Talking to a mate who has a Ford Mondeo Diesel and guess what they have the same problem. He has to take it for a burn down the highway about once a fortnight to clear it as the car is used mainly in the city i.e. short trips. So it is not only a Jeep problem!!
That's interesting, but why is it that DPF regen has not been an issue with the MY 11, 12 & 13 CRD JGCs, if at all? Something has changed.
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  #10210  
Old 03-10-2014, 02:43 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by rain13 View Post
Getting my CRD serviced on Wednesday they quoted $450 does this sound about right? I'm going to ask them to try and reverse it using only the reverse camera so they understand the frustrations. Being old school I only use it for kids ect but the missus is all over me to get it fixed as she can't see anything at night and just during the day. Feedback on service price would be great.
I just paid $398 for a 10000km/6 month service
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  #10211  
Old 03-10-2014, 02:46 AM
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Re: 2014 Grand Cherokee information - Australia

Quote:
Originally Posted by Swampy View Post
That's interesting, but why is it that DPF regen has not been an issue with the MY 11, 12 & 13 CRD JGCs, if at all? Something has changed.
That is the million dollar question....
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  #10212  
Old 03-10-2014, 02:50 AM
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What service is it? How many kms/months?
. 10000 km
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