Ecodiesel power derating as temps rise?

[Hondo1]

While I’m grateful for all the info in this thread, it has me super bummed.

I was seriously considering trading my Mojave for a JTRD, but it looks like my towing duties would put the diesel right in the danger zone.

I live in Reno and tow our boat to Lake Tahoe and a few other higher altitude lakes. Altitude, high summer temps, going up steeper inclines. FML

Question for those of you experiencing the derate… does it take time before it shuts down going up the steep inclines? My routes have decent inclines, but they are fairly short. Maybe a minute or two going up.

I was supposed to test drive the diesel today. Thinking about skipping it. I could always just regear the Mojave.

my has yet to shut down, when it derates it will slow me down to 30-40mph

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[shredX]

my has yet to shut down, when it derates it will slow me down to 30-40mph

I typically tow between 55 and 65 mph. When I’m on the inclines I always slow down to 55 miles an hour due to the nature of the 3.6 and the high revs. When yours has derated is it after a long sustained climb, or does it happen pretty quick?

 

[Hondo1]

I typically tow between 55 and 65 mph. When I’m on the inclines I always slow down to 55 miles an hour due to the nature of the 3.6 and the high revs. When yours has derated is it after a long sustained climb, or does it happen pretty quick?

After a long climb in hot weather. I’m in Colorado

 

[CrazyCooter]

While I’m grateful for all the info in this thread, it has me super bummed.

I was seriously considering trading my Mojave for a JTRD, but it looks like my towing duties would put the diesel right in the danger zone.

I live in Reno and tow our boat to Lake Tahoe and a few other higher altitude lakes. Altitude, high summer temps, going up steeper inclines. FML

Question for those of you experiencing the derate… does it take time before it shuts down going up the steep inclines? My routes have decent inclines, but they are fairly short. Maybe a minute or two going up.

I was supposed to test drive the diesel today. Thinking about skipping it. I could always just regear the Mojave.

Everything you are asking is in this thread......Look at post #41 to start and work your way down another 15-20

 

[steelponycowboy]

While I’m grateful for all the info in this thread, it has me super bummed.

I was seriously considering trading my Mojave for a JTRD, but it looks like my towing duties would put the diesel right in the danger zone.

I live in Reno and tow our boat to Lake Tahoe and a few other higher altitude lakes. Altitude, high summer temps, going up steeper inclines. FML

Question for those of you experiencing the derate… does it take time before it shuts down going up the steep inclines? My routes have decent inclines, but they are fairly short. Maybe a minute or two going up.

I was supposed to test drive the diesel today. Thinking about skipping it. I could always just regear the Mojave.

I have not shut down yet, dealer told me that it will shut down at 270, the most I've gotten was 268. That was on a 4 mile, 6% grade NOT towing. Today I pulled a Uhaul trailer weighting a total of about 1000 lbs total, all flat land and my MPG was 11.7. I am not happy with my eco diesel

 

[HighNoon]

Well I tow a lot and I am real happy with mine. I don’t look at mpg, I look at towing proportions and the diesel hits it out of the park for me. I would be gear hunting with the gas engine. I also don’t live in the extreme temperature areas that some of you do.

 

[steelponycowboy]

Well I tow a lot and I am real happy with mine. I don’t look at mpg, I look at towing proportions and the diesel hits it out of the park for me. I would be gear hunting with the gas engine. I also don’t live in the extreme temperature areas that some of you do.

I travel all over the country from NH to FLA to Canada down to Mexico, CA and everywhere in between. My eco diesel was fine until it had a major failure in TX this summer. Used to get 26mpg, now it gets 14 or so. I would not look so much about MPG either if the swing was not so sharp. Besides the 11.7 this morning was at 50 degrees on flat land doing 55. Some of us have issues with the diesel that are well documented on the forum. Everyone I know that have the 3.6 get better mileage than I do which is sad.

 

[OMTBiker]

I travel all over the country from NH to FLA to Canada down to Mexico, CA and everywhere in between. My eco diesel was fine until it had a major failure in TX this summer. Used to get 26mpg, now it gets 14 or so. I would not look so much about MPG either if the swing was not so sharp. Besides the 11.7 this morning was at 50 degrees on flat land doing 55. Some of us have issues with the diesel that are well documented on the forum. Everyone I know that have the 3.6 get better mileage than I do which is sad.

What was the major failure, have you taken it back to the dealer to fix? Going from 26 to 14 mpg is not right. My JTR with the 3.6 would get 6-8 towing on average with a 3000lb trailer, a friend with another JTR gets 11-12 towing a 5000lb trailer. I got rid of my JTR and have been thinking about a JTRD specifically for better towing, I really do n to want a fill size truck. I am concerned with the derating as we typically travel out west once a year to the mountains.

 

[HighNoon]

Like I said I don’t tow extreme temps and terrain. I am mid range on weight but have a lot of wind drag. I also followed all the crazy break in requirements. If I was going to be towing upper limits of weight and temps I would have bought a one ton.

 

[kooltoys]

I travel all over the country from NH to FLA to Canada down to Mexico, CA and everywhere in between. My eco diesel was fine until it had a major failure in TX this summer. Used to get 26mpg, now it gets 14 or so. I would not look so much about MPG either if the swing was not so sharp. Besides the 11.7 this morning was at 50 degrees on flat land doing 55. Some of us have issues with the diesel that are well documented on the forum. Everyone I know that have the 3.6 get better mileage than I do which is sad.

if your mileage has dropped that much where is the fuel going? does it smell rich? how much DEF are you using?

I would think this has to be something with the injection pump or injectors unless your leaking fuel. maybe a air intake sensor reading to high.. These things are not so different then Mercedes OM642, "DR A" over in the sprinter-source forum is a freaking genius and knows way to much about these diesels

 

[steelponycowboy]

What was the major failure, have you taken it back to the dealer to fix? Going from 26 to 14 mpg is not right. My JTR with the 3.6 would get 6-8 towing on average with a 3000lb trailer, a friend with another JTR gets 11-12 towing a 5000lb trailer. I got rid of my JTR and have been thinking about a JTRD specifically for better towing, I really do n to want a fill size truck. I am concerned with the derating as we typically travel out west once a year to the mountains.

The major failure was the DPF. The message that took up the whole display between the speedo and tach said "Major Diesel Exhaust System Failure, take to dealer immediately" and it went into limp mode. I had no warning, just died on me. It spent two days at the Jeep dealer in Odessa, TX, took it back to my dealer and he said no codes and they have no idea what might be wrong. it is supposed to go back in again next week, The big hold up is they are going to need it several days and don't have any loaners (my extended warranty gives me rental for free but they don't have any and have not for a while). I am afraid to tow because I come within 2 degrees of going into limp mode going up a 4 mile, 6 degree grade. I would hate to try to tow any distance fearing going into limp mode on even a small hill.

 

[sandman83]

This pic was taken as I crested the climb north from Camp Verde, AZ, to the weight-station/rest area. The trailer being pulled is a 2014 28' Airstream International; the oil temp spiked to 240f when I had to increase speed to 70mph in order to overtake a slower RV. Once I resumed 62mph, oil temp returned to 235f, then back to 220f at the Sedona exit. Coolant held at 217f, and the venerable 8HP just barely fanned itself at 199f. With 4.56 gearing on 37 13.50's, it has little difficulty holding 7th on the grade while using cruise control. And finally, intake air temp dropped from the insane 199f pre-scoops to 88f, although ambient air was about 20f higher on the prior figure. I feel, that as far as my needs are concerned, this is a good balance.

Edit for pore grammer

This is really helpful; heavy load, steep grade, good speed and excellent results. Super

 

[steelponycowboy]

This is really helpful; heavy load, steep grade, good speed and excellent results. Super

Wow you are lucky or I got a lemon. 268 degree oil temp 4 miles up Rt 87 from Sunflower to Mt Ord. Way less hill and distance than the one out of Camp Verde and I was not towing anything.

 

[Deleted member 22728]

Wow you are lucky or I got a lemon. 268 degree oil temp 4 miles up Rt 87 from Sunflower to Mt Ord. Way less hill and distance than the one out of Camp Verde and I was not towing anything.

I only speak from my experience, my training, and my own vehicle. Also, I am a practicing technician and trainer, and have owned/own the Motori platform in both the JT and WK2 versions, so my feedback is that of a relative "forum freak".

 

[cotnballs2000]

Wow you are lucky or I got a lemon. 268 degree oil temp 4 miles up Rt 87 from Sunflower to Mt Ord. Way less hill and distance than the one out of Camp Verde and I was not towing anything.

Try keeping your RPMs up to help with EGTs, manually shift the auto to a lower gear. 1979wagoneer has tire and gear size on you which raises his RPMs and helps lower his EGTs
.

This is for crazycooter who laughed, FYI the ecodiesel has oil injectors that cool the bottom of the pistons. This is where oil picks up its heat (that and the turbo) from the higher cylinder pressures. A few ways to lower EGTs, back off on the throttle (load), increase the flow (higher RPM), and a free flowing exhaust. You people are chasing your tails with oil coolers and air flow which is just a band aide on a bullet wound.
https://official.bankspower.com/tech_article/why-egt-is-important/

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