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  #7345  
Old 01-14-2013, 10:34 AM
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Re: 2014 Grand Cherokee - Features & Changes

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Originally Posted by Vanguard View Post
Diesel's dirty little secret

I've also had the pleasure of replacing an intake manifold and EGR valve due to soot backing up in both...out of warranty in a 2007 1.9 liter engine. Never again will I get wallet raped like that.
Eh, I've never been able to not find diesel fuel and I've pretty much been all over 49 out of the 50 states. And let me guess, you have/had a VW 1.9 TDI and you went to the dealer for the work. That can be less than pleasant (they typically go by the book which is very very wrong). In any case, you could have done it yourself for about $39 and 4-5hrs of time or taken it to a local guru for about $300 to have it cleaned.


It only really builds up if you granny drive it for mileage. If you drive it like you stole it periodically, it cleans it out.


The criticism of the DPF is a valid one. It's something you have to be aware of.
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  #7346  
Old 01-14-2013, 10:37 AM
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Re: 2014 Grand Cherokee - Features & Changes

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Originally Posted by Vanguard View Post
Also, the diesel particulate filters are embarassing when they kick into the "regeneration" process. This process happens every few hundred miles and the car begins to idle high, making weird noises and expelling soot from the exhaust.

You are advised to wait and let the process finish, which can take up to 15 mins.
I'm a diesel newbie (in the sense that I've never owned one myself before) so can someone help clarify/confirm/deny this "regeneration" issue? I know that diesel engines are cleaned up from the "bad old days" but is there really an uninterruptable process that kicks in every few hundred miles and forces you to wait before you can continue with whatever you were doing? That would be ridiculously annoying and not something I would put up with, even if this motor's emissions were so clean that it cleaned the air around it. I'm trying to decide whether I should hold out for the diesel or not, but I can't even find out about something like this with a test drive - can anyone with real world knowledge (with a recent, comparable diesel engine) share their thoughts? Thanks!

(Vanguard, not saying your knowledge isn't real world - it's just not clear to me how long ago you had this bad experience with diesels and if things might have changed since then.)
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  #7347  
Old 01-14-2013, 10:39 AM
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Re: 2014 Grand Cherokee - Features & Changes

Pic from a buddy at NAIAS --
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  #7348  
Old 01-14-2013, 10:43 AM
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Re: 2014 Grand Cherokee - Features & Changes

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Originally Posted by ClarkKent View Post
I'm a diesel newbie (in the sense that I've never owned one myself before) so can someone help clarify/confirm/deny this "regeneration" issue? I know that diesel engines are cleaned up from the "bad old days" but is there really an uninterruptable process that kicks in every few hundred miles and forces you to wait before you can continue with whatever you were doing? That would be ridiculously annoying and not something I would put up with, even if this motor's emissions were so clean that it cleaned the air around it. I'm trying to decide whether I should hold out for the diesel or not, but I can't even find out about something like this with a test drive - can anyone with real world knowledge (with a recent, comparable diesel engine) share their thoughts? Thanks!

(Vanguard, not saying your knowledge isn't real world - it's just not clear to me how long ago you had this bad experience with diesels and if things might have changed since then.)
It is an interruptable process up to a certain point but beyond that point the vehicle will pretty much force a regeneration cycle. All you need to do is drive the vehicle. Many times you won't even notice a regeneration happened. Only time you will notice is if you haven't driven the vehicle enough for the cycle to happen. It will keep performing the regen until the soot is burned off.
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  #7349  
Old 01-14-2013, 10:46 AM
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Re: 2014 Grand Cherokee - Features & Changes

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It only really builds up if you granny drive it for mileage. If you drive it like you stole it periodically, it cleans it out.


Works for me!
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Old 01-14-2013, 10:52 AM
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  #7351  
Old 01-14-2013, 10:54 AM
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Re: 2014 Grand Cherokee - Features & Changes

Been driving nothing but diesels for 10 years (1.9 VW and 5.9 Dodge, both over 220K now). If you are a daily 5-10 mile commuter in town, they may not be for you, you need to get out and run em good every once in a while. What was said about VW dealers service is true, but there are several diesel gurus out there who work wonders with these things if and when they need service. I had my 1.9 ECU flashed to eliminate the EGR recirc and my Vdub runs great and the intake stays clean as a whistle-but I drive both almost always 30-40 miles at highway speeds. If you're a diesel newbie, get out and test drive the few that are out there (VW 2.0 liter, BMW/Merced 3.0 liter), I think you'll be pleasantly surprised at the get up and go these things have when that turbo kicks in at 1800 or so RPM. Talked brother in law into a BMW X5 diesel and he is sold on it, with NO regen issues. And mileage figures for diesels are most always under estimated...visit the VW TDI forums and see that new Passats that are rated in the 40's are touching the 50's in real world driving. Don't be skeered, come over to the dark side, and enjoy!
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Old 01-14-2013, 10:55 AM
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Re: 2014 Grand Cherokee - Features & Changes

Basically all a regen does is send extra heat to the exhaust in order to burn off soot and/or any other particulates that accumulate. In order to do this the engine idles at a higer RPM than normal. If you're paying attention to your gauges, you'll notice the temp a little higher than normal and your Tach go up. It won't be high enough to produce the cloud of black smoke the older diesels puff out, and if you turn off your engine in mid-cycle, it won't hurt it at all. You don't have to sit in your car and wait it out, it'll just restart when you get back in and start driving.

But as others have stated, if you just get on it every now and then, you'll keep it pretty clean anyway.
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Old 01-14-2013, 10:55 AM
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Re: 2014 Grand Cherokee - Features & Changes

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Originally Posted by ClarkKent View Post
I'm a diesel newbie (in the sense that I've never owned one myself before) so can someone help clarify/confirm/deny this "regeneration" issue? I know that diesel engines are cleaned up from the "bad old days" but is there really an uninterruptable process that kicks in every few hundred miles and forces you to wait before you can continue with whatever you were doing? That would be ridiculously annoying and not something I would put up with, even if this motor's emissions were so clean that it cleaned the air around it. I'm trying to decide whether I should hold out for the diesel or not, but I can't even find out about something like this with a test drive - can anyone with real world knowledge (with a recent, comparable diesel engine) share their thoughts? Thanks!
During regen, the ECU basically richens up the mixture to raise the exhaust gas temps up to basically do an "afterburn" in the particulate filter. Kinda like a self cleaning oven.

We have a 2.0 TDI used almost exclusively for city driving and the regen cycle does not happen too often. If it occurs while driving, you will feel a slight slugishness for a few minutes. If it is doing it when you get to your destination and turn it off, on the TDI anyway, the cooling fan will continue to run for a few minutes until it is done. No big deal really. I do try to get a good freeway run in a couple times a month to get everything good and hot.

The bigger issue with modern diesels in the states anyway is the availability of proper oil for do it yourself oil changes. These engines need special low ash oil, and each manufacturer has their own approved specification. That has been the biggest issue on the VW; time will tell with the Jeep.

That and making sure the idjit at the dealership doesn't put gas in it for you...

Edit .. 205'd...
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  #7354  
Old 01-14-2013, 10:55 AM
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Re: 2014 Grand Cherokee - Features & Changes

The Pacific Blue isn't listed on the Jeep website yet, I wonder if it's going to be late availability...
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Old 01-14-2013, 10:56 AM
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Re: 2014 Grand Cherokee - Features & Changes

Thanks for the pics Scott... keep 'em comin'!
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Old 01-14-2013, 11:02 AM
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Re: 2014 Grand Cherokee - Features & Changes

Darn pesky Jeep website. Really was hoping Build Your Own would be up for the 2014s just announced. Of course, error-ed out - this would be the link though.
Build & PriceError
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