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  #145  
Old 09-01-2016, 05:26 PM
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Re: exhaust system regeneration process

[QUOTE=Roadkill;1320558]I just wanted to reiterate that if you saw any sort of message about a regen, the filter being x% full, or driving at highway speeds, then that by definition is *not* a normal regen. It's the "emergency" type.


I had been calling it a 'normal' regen message since the service tech's have all been calling it that...but yeah I guess if any % clogged message which requires regen would be of an 'emergency' type. Hence why the message comes up in RED...nothing good is ever accompanied by RED!

thanks again for the reply...I will update once I start using higher cetane diesel and reduce my idling times. Love the diesel so far but after spending so much on this SUV for the diesel option (plus the additional $5-6k in armor to bring it up to some standard of off-road readiness) I am a little disappointed in this DPF regen. Counter-intuitive for the extra torque given for towing, mudding, etc which in my opinion will likely cause more frequent regens in more remote places.

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  #146  
Old 09-01-2016, 06:06 PM
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Yep, as a rule of thumb, on a stock tune a regular EcoDiesel will average about 2 full regens per tank of fuel. The driver will normally never see any indication these normal regens are happening except perhaps seeing a lower fuel efficiency for the ~12 minutes or so while it burns off the soot.

If you were to buy an inexpensive obd II Bluetooth and use the Torque app you can see/log the current regen status (among other things). Running Torque on a tablet will also let you run it in HUD mode and display the gauges as an HUD on the windshield.
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  #147  
Old 09-02-2016, 02:01 AM
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Re: exhaust system regeneration process

What is HUD mode. I am in the process of setting up Torque Pro so still learning.


Trevor
PS have you been able to get ATF temp.
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  #148  
Old 09-02-2016, 06:47 AM
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Originally Posted by tasjeep View Post
What is HUD mode. I am in the process of setting up Torque Pro so still learning.
HUD mode causes torque to display mirror image (i.e. flipped) gauges. You then set your tablet face up near the windshield, and the screen reflects off the windshield, creating a Heads Up Display. Obviously, this works best at night. I set my torque to have a black background and blue-green gauges.

The trans temp is an outstanding problem. So is *actual* DPF soot level, but the OBD dpf soot pid we have is better than nothing.

More on-topic: I do mostly in-city driving and I see my Jeep doing brief active regens on surface streets while I'm only traveling 55 km/h (35 mph). I often won't get up to highway speeds for a month at a time, but I still never see those emergency regen messages. I get low fuel economy around town though, because the Jeep is pumping fuel through the engine for brief regens rather frequently. Again, I know this because I use Torque/OBDII data for regens, soot levels, and temps... nothing is displayed on EVIC regarding my normal regens.
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  #149  
Old 09-02-2016, 02:28 PM
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Re: exhaust system regeneration process

[QUOTE=Roadkill;1320722].

The trans temp is an outstanding problem. So is *actual* DPF soot level, but the OBD dpf soot pid we have is better than nothing.


Thanks for that. Have the DPF set up, currently around 45% and waiting to see what happens.

Trevor
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  #150  
Old 09-02-2016, 06:10 PM
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Originally Posted by tasjeep View Post
Thanks for that. Have the DPF set up, currently around 45% and waiting to see what happens.
If you are running the stock tune, this will get to 66% then jump to 100%. With the OBD dpf pid, 100% simply means "ready to regen, when possible". A stock tune will then activate the active regen process fairly quickly if you're on the highway. The regen pid will then begin to return a value of 3 (active regen) instead of 0. The cat b1s1 temp will rise to ~650 °C for about 12 minutes or so during the burn off. The DPF soot level will then drop down to 8 or 9% and the regen pid will return to 0, indicating the regen is complete.

Conversely, you may see the pid at 100% for a long time... that happens to me, because it doesn't reset below 100% until a regen completes fully. Since my in-city driving pattern means my Jeep burns off a bit at a time, my soot level drops down but that isn't a full regen and so it still shows 100%. I have driven for over 300 km on the highway nonstop with the OBD pid showing 100% before the Jeep decided to regen, because it had been doing those in-town mini-regens before I started on that trip so my actual soot level was much lower.

This is why accessing the actual DPF soot level PID would be useful (the ScanGauge II can access it). As always, I've never seen an "emergency" message about the DPF on my EVIC, so all of what I described is normal.
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  #151  
Old 11-04-2016, 10:07 PM
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Re: exhaust system regeneration process

Posted same response below in another thread: DEF Filter Warnings

My 2015 Jeep Grand Cherokee has about 12K miles on it and I have seen the 'Exhaust filter almost full, keep driving at highway speeds....' message about 4 times now. Usually I continue driving normally and the message eventually goes away. A couple of times I even parked the vehicle with the message on and eventually got back on the highway and it cleared out.

Last week I experienced a lot of traffic and this past weekend drove a bunch of city miles running errands when the message popped up. I was not able to get on the freeway and the vehicle was parked all day on Sunday before I drove it to work on Monday. Before I could get on the freeway the vehicle went into limp mode and produced the message 'Exhause filter 100% full, see dealership for service'. At that point, even though my throttle was reduced, I could still get on the freeway and go over 60 MPH. Seems that I just lost the turbo function with my engine.

Based on recommendations from this thread, I tried to keep the engine revving at around 2000 RPM and drove around 30 miles mostly on the freeway going 60 MPH. It seems that once the message comes up that the exhaust filter is 100% full, the exhaust filter regeneration process no longer functions and you have no choice but to go to the dealership.

I took my Jeep in and told the service rep that they would need to do a forced regeneration of my exhaust filter. Later in the day the service rep called me to tell me that the mechanic looked at it and said that the exhaust filter and a sensor would need to be replaced. I questioned this telling them that all they need to do was the forced regeneration, and he said it was not possible because the car could not go over 20 MPH. This did not make sense since I was driving 60 MPH the previous night and drove over 40 MPH to get to the dealership.

After some back and forth with the service guy as a middle man and some internal frustration on my part, the mechanic finally realized that they could use their diagnositic tool to run the forced generation which fixed the problem. Unfortunately they had to keep the vehicle overnight and this problem that could have been fixed in hours took a day and a half to address.

Now I know that when the message comes up that the exhaust filter is almost full - it is a priority to get some freeway miles in.
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  #152  
Old 11-05-2016, 10:56 AM
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Re: exhaust system regeneration process

Hello 808wk2...I had the exact same issues as you for the first couple months owning my diesel. I basically think the diesel particulate filter is about the most useless piece of crap ever designed. I had no idea this was a relatively new requirement on diesels, and there to enforce some unrealistic "Leo Before The Flood" type hype emissions requirements. Otherwise it may have influenced my decision to buy the diesel.

I had the emergency message come up once or twice per full tank during the first couple months and since I was very new to the technology had no idea what I was doing wrong. Yes I did mainly city driving as well, which really shouldnt make a lick of difference on a $70k machine. I typically went on the highway and drove for 10min at 80km/h plus to clear the message, however at one time I let it hit 70% full (which apparently is an industry standard warning notice on diesels). Once it hits 70% on the wk2 you have very little time to clear before 100% full...which I learned and had to take to the dealer for a forced burn.

So I started doing some reading up on this and outside of a bypass/tuning kit (which is not an option for me under warranty, maybe afterward), the two obvious things to try was not idiling as much and try some different, higher grade diesel (low sulphur content, higher cetane number, additives).

Since I was buying diesel from Superstore here in Canada, which is basically ESSO without any additives, I decided to try Shell V-Power. I have NOT had the regen issue since. Keeping in mind this diesel is about 10 cents more a liter than regular. What I have been doing now is filling every second tank with V-Power and every second tank at an Esso or another reputable low sulphur station. Very happy with the results so far. I dont see any noticeable increase in power or mileage, nor do I care, but not seeing that message is worth the extra cost for sure.

Keeping in mind as I do watch how much I idle now as well, but during the winter months I cant see me not idling for longer periods so I will see how that plays out.
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  #153  
Old 11-05-2016, 02:00 PM
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Re: exhaust system regeneration process

Mark,

I think you maybe right on about the fuel quality. Before this last issue happened, I filled up at a gas station that I don't normally go to and right after they closed down and looks like they are rebuilding the gas station. Besides being a lower quality, the gas I pumped was probably scraping the bottom of the barrel.

I also agree that avoiding letting the Jeep sit and idel helps too. I sometimes idel when on the phone for periods of time and it probably contributes to filing up the filter quickly.

Once the Jeep falls out of warranty, it sounds like the GDE Hot Tune is a good way to improve upon the problem for city drivers and hourly avoid full filter scenarios.
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  #154  
Old 02-06-2017, 02:33 PM
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Re: exhaust system regeneration process

My first regeneration from the dpf after 680km at 1200grad celsius

The old mercedes diesel in my 300c / same from the wk1 have regenerate the dpf on 700 grad

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  #155  
Old 02-13-2017, 02:29 PM
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Re: exhaust system regeneration process

My second after exactly after 545km

And i drive more highway, the older mb diesel have regeneration all 1000km.

Somone have the same expirience?


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