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Discussion Starter #1
So, I have a puzzle for the RAM Eco-diesel experts and mechanical specialists.

Truck: 2014 RAM with 30k on the motor (102k on the truck). Stock all around. AEM performed in June 2019. EGR replaced and updated AEM on April 22, 2020. Other than the feeling my truck had it's balls stepped on back in 2019, it has been fine. Change oil every 6k miles and complete the other tune ups within reason. MAP sensor has been clean one a year since 2019.

Background: I daily drive about 12.5 miles one way. I live in UP of Michigan and we just emerged from the cold weather in mid-May. I've been running Torque Pro app since January 2019 and monitor various items including DPF loading and regen frequency. Other than when I'm towing, the regen frequency and DPF loading has been within a nice tight Gaussian distribution. During the winter, loading increases about 6% for every cold restart (12% per day) and regens occurred about every 100-120 miles. During the summer (above 40F every day), loading increased by about 4.5 to 5% and regens expanded to about 135-140 miles. The one exception was Thanksgiving 2019 on a trip to see family. 300 miles each way and it only regened after we arrive on each end.

The Puzzle: On April 22, 2020 I receive a new EGR and the updated AEM tune. I got the truck back and it seemed to be fine. Throttle response might be better?.?.? I noticed it was "smoother" but still lacks some power until it builds RPM. Eh. I was used to older engines from my youth so ... meh. I can work around it. All seemed fine. Same DPF loading changes and regens until May 22, 2020. On that day we drove 90 miles to get our travel trailer. All seemed fine on the way to the storage location. Dropped in some fuel just before hooking up (hey, it was $1.99/gallon) and then pulled out. During the 90 mile return trip it did it's usual DPF loading would go up, then down, then back up. Then it regened. Not once but twice in 90 miles. Okay. I was generating a bunch of boost so it didn't seem out of the ordinary ... yet. During 2019 I saw something similar while towing although it generally never triggered a regen so early. After towing it went back to normal. This year, however, ever since I towed the trailer back it now acts funny. Coming up the hill out of town, a bit of a climb in 7th gear and running about 10psi boost, the DPF loading will jump by 10+%. It will then drop back as soon as the boost returns to "cruising" speed. As you can imagine, this results in the truck going into regen mode a lot more often. More like about 75 miles per regen.

Fuel mileage is about 23 mpg on my daily trip. That's typical for my drive around here given the short drive and the hill I have to climb every afternoon. Power feels the same. No codes.

So, have I gone crazy or is there something to be considering. DPF/DOC going to take a dump? Sensor going out?
 

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Discussion Starter #2 (Edited)
Well. I haven't gone crazy. Just returned from 2 days at a State Park in the Keweenaw. 100 miles up and 100 miles back. Did a bit of driving around on day 2. The truck regened 3 times on the way to the park and 4 times on the way back. No more than finished a regen and DPF loading jumps up to 20+% within minutes.

Either this new "tune" is generating a helluva lot of soot when towing or there is something going wrong on my truck.

Any suggestions? Dealer tech is going to call me crazy.
 

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2015 Outdoorsman EcoD CC w/6.4' 4X4
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I think I'll second that there might be something wrong with the DPF sensor. Seems odd the DPF % goes up then back down. Only time I can think of when the DPF has gone down without an active regen is while towing heavy.
 

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Discussion Starter #5
Is it possible the DPF is not actually getting cleaned properly during a regen or a dpf sensor is bad.?
I can't believe its not getting cleaned out. EGT temps all go to 1100+F and the regen lasts for about 11-12 minutes as usual.

Fuel mileage is fine as well. Towing I got 12-13 ish this week. Need to dump a load in it Monday to compute the specifics. Fuel mileage before the trip was 22 mpg on my daily running.

EDIT: I'm going to call my dealer on Monday so I can get the run-around started. Perhaps their fancy computer will see something up with the data stream so they can call it. With this many regens I'm concerned about diesel in my oil but considering that towing keeps the oil temp at 230F, it might survive.
 

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Need to monitor the dpf differential pressure while driving. Mine is generally under 1 psi driving empty and can go up to 2.5 psi under load. After a completed regen pressure drops to 0.1 psi at idle.
 

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I am using alfa obd. But someone with torque can help. I used to have the torque in my old phone which got run over by ecodiesel when doing a brake job 😒
 

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Discussion Starter #9
Need to monitor the dpf differential pressure while driving. Mine is generally under 1 psi driving empty and can go up to 2.5 psi under load. After a completed regen pressure drops to 0.1 psi at idle.
I do track that value in Torque Pro. I'll pull up some data and see what it says. My quick glances at the display has never turned up any strange numbers.
 

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2015 Outdoorsman EcoD CC w/6.4' 4X4
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My Torque Pro has a built in one which I believe is the correct one. You can also get some help from this thread. Torque Pro Thread of all Threads
I'll have to look next time I fire up Torque in the truck. There is quite a few custom PIDs in that thread, some have multiple different formulas, and I was feeling lazy to look for it...LOL!
 

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Discussion Starter #13
Sounds like my 15 right after I had the AEM flash. The soot would build so fast when towing my 4500 pound boat that it would regen every 10-15 miles. On hard acceleration the soot would climb 10-20 percent then drop back down when I let up.
Re installing my GDE tune took care of my problem.
I was afraid someone would say that. Might need to get that tune sooner than expected.
 

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I've been having the same experience since VA7 and maybe even before that.
 

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Discussion Starter #15
So, I just had the dealer look at it on 7/29/2020. The worst $110 spent in my entire life. They performed a stationary regen (before a test drive) and then test drove it "over lunch". It appears they didn't attempt to reproduce my "customer complaint" at all. The big issue is I don't get to speak with the auto tech so how is he to know those minuet details. To be honest, they probably don't get many customers that actually watch their DPF, DEF, boost, EGTs, and other items like I do. It's a retentive thing but this piece of steel and plastic has 104k on the truck and 33k on the engine and I would like about 5-7 more years out of it. If it's not an "emission/injection" thing then it doesn't fit under the settlement extended warranty but they care nothing about that.

Worst part is I like my dealer service department. Sales ... eh ... they can kiss off after the way I was treated back in January.

I'm just venting at this point. Wish I could convince the wife to let me get the GDE tune.
 

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^^ Tell her it is an investment, the payoff in fuel savings is long before the 5-7 year mark for life of the truck. Plus it will be a pleasure to drive the remainder of it's life.
 

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Discussion Starter #17
^^ Tell her it is an investment, the payoff in fuel savings is long before the 5-7 year mark for life of the truck. Plus it will be a pleasure to drive the remainder of it's life.
Agreed. I'm going to work on it again. With my driving habits and towing needs, a better tune is the only real option. Otherwise, it's getting traded for a Titan 5.7L gasser.
 

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She can call me for validation.
I GDE tuned after EGR cooler failure and multiple check engine lights, limp mode and other heartburn. That was over 2 1/2 years and 135,000 kms ago without a single issue. .Worth it not having to go to the dealer to be ripped off, the gas savings and much better performance.
 

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Discussion Starter #19
I got a new question/theory. I was looking at the pictures and description on AllDataDIY. There are two lines leading to the differential pressure sensor. One from between the DOC and DPF and one a few inches downstream from the DPF. Crawled under my truck and see the lines leading to the sensor which is not in a convenient location. The first section of line is steel. Then it connects to a rubber connection and then on to the sensor. If one of the connections or lines or the sensor itself had a small hole, then as the engine RPMs rise and the gas flow increases then that line with the small hole could see less of a rise in pressure from the increases in gas flow. The resulting fictitious pressure difference could result in a false reading of DPF differential sensor.

How could one go about diagnosing that without just up and replacing the lines?

Could it be the DPF somehow messed up inside causing the problem?
 
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