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  #13  
Old 09-07-2014, 08:08 PM
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Re: Overheating?

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Originally Posted by Roadkill View Post
I'm fairly certain regen shows up as a spike in Cat1Bank1 rather than EGT per se. At least that's how I have seen it: random, ~10 minute spikes of C1B1 temps to 600 C while on open, flat highway. EGT doesn't get that high during the regen.

The only time I have been instructed to do an active regen was a few days after I started using the power-brake/turbo launch to avoid getting caught without power while turning through a busy intersection.
You're right. It's the sensor right upstream from the DPF, whatever your OBDII scanner calls it.

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  #14  
Old 09-07-2014, 10:18 PM
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Re: Overheating?

Actually the CAT sensor is what most ODB2 scanners can see and the sensor is just downstream of the DPF. I'm not sure what the mapping of the sensor name and bank is for the actual DPF sensor but I got the ScanGuage folks to send me the Xgauge codes and can now read EGT, DPF, and CAT temps. During regen EGT stays normal and everything from the DPF back goes to 1200F or close. The CAT reads a little cooler.
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Old 09-08-2014, 12:16 AM
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Re: Overheating?

Do you happen to have the Torque PID for the DPF reading?
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  #16  
Old 09-08-2014, 08:18 AM
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Re: Overheating?

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Originally Posted by Roadkill View Post
Do you happen to have the Torque PID for the DPF reading?
No sir, I do not. I've tried to figure out the PID based on the working Xgauge values...but I wasn't able.

The Xgauge DPF codes are in another thread.

http://www.jeepgarage.org/f222/scanguage2-xguage-codes-for-egt-76564-post1045136.html
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  #17  
Old 09-12-2014, 09:04 PM
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Re: Overheating?

We tow a 3Tonne van in Australia, and have never experienced a regen message, nor experienced overheating. I nearly always run the "Dash Command" app on the iPad when towing. The most obvious thing when it does a normal regen is that your instantaneous fuel consumption increases for a while as it injects extra fuel to burn out the DPF, of course only noticeable when driving at steady speed on the flat.

Yes, they run hot, and are obviously designed to do so. The thermostat doesn't even begin to open till very hot, about 96degrees Celsius (205F). And of course, it's not fully open till much later.
When towing, I've seen temps from 96C (downhill) to a max so far of about 112C from memory-still way below boiling of the pressurised cooling system.
And yes, the gauge is very active, moving up when under heavy load uphill, but stops before reaching the red. Engine oil temp also runs higher in such circumstances, but again way below that which would be an issue for these hitech synthetic oils.
(Most modern cars have temp gauges which are dumbed down, and don't move till just before they go off the clock and boil. You might as well just have a temp light in such circumstances!)

I've heard of lots of people complain about the gauge movement, but have yet to hear of anybody having an engine which actually overheats!

Transmission temps that I have seen when towing are excellent, with no sign of overheating whatsoever.
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  #18  
Old 09-19-2014, 09:43 PM
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Re: Overheating?

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Originally Posted by GunninIt View Post
About to post a trip report on my first long-distance excursion in the diesel, but thought I'd post up a question about how hot all your 3.0's run. While coming home from our trip, we were heading southbound on California's Interstate 5. When we arrived at an area called the Grapevine, we started our winding crawl up the mountain from about 1500 ft elevation to about 4200 feet elevation. It wasn't overly hot for California, but it was in the low- to mid-90's on the valley floor, and just below 90 at the top of the pass.



As we headed up the pass, we saw the typical old cars and overloaded cars, trailers, and SUVs pulled over on the side overheated. Hoods up. People staring at steam rising out of their radiator.



As we continued our climb, I noticed that our temp gauge started climbing as well. No big deal. Then it really started to get high. Hmmm. Then it settled down right below the red (orange?) mark near the top of the temp gauge. At that point, I stopped traveling at 70mph and pulled over a couple lanes and dropped in to a slower pace. Temps came back down. By the time I hit and was over the pass, it was back at about mid-level or lower on the gauge.



So, gurus, would I have overheated had I kept it up? Did I have anything to worry about? Should I have been more cautious from the getgo?



As an aside, I was carrying our Thule roof box, four bikes, a load of camping supplies in the back, and my wife and child.





I do this climb all the time seriously railing the thing up the hill. Ppl look at me like im crazy. I am a little lol. But thats not the point. The needle does get up there but not close to the red zone. Id be a little concern.
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  #19  
Old 10-01-2014, 02:23 PM
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Re: Overheating?

The only overheating issue I've had is in towing up a long grade in high (>90 deg F) ambient air temps.

For the most part the water temp gauge will quickly rise up to just about the red mark, then stabilize. This make sense, understanding the set point of the thermostat in the cooling system. Once the load is reduced, the gauge quickly comes back down.

On a trip last month, I was towing ~5000 lb Airstream up a long grade in the Central Sierra, and the gauge was just below redline. I pulled over into a turnoff for some reason (probably rubbernecking) and turned off the engine for a couple of minutes.

When I restarted the engine and pulled back onto the road I was in limp mode for about 30 seconds, until the fan pulled the water temp back down...

Lesson Learned: Don't turn off the engine when the water temp is at redline.
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  #20  
Old 10-01-2014, 03:00 PM
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Re: Overheating?

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Originally Posted by Halfdeaf View Post
Lesson Learned: Don't turn off the engine when the water temp is at redline.
Also keep in mind that the turbo needs time to cool down before shutting down when you are working the motor hard. I think this is even outlined in the manual.
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Old 10-01-2014, 05:41 PM
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Re: Overheating?

Turn off air conditioning, too, since that saps power and reduces the cooling capacity of the engine's radiator as it is blocked by the hot A/C cooling fins.
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  #22  
Old 10-01-2014, 06:25 PM
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Re: Overheating?

Quote:
Originally Posted by hayasa View Post
Turn off air conditioning, too, since that saps power and reduces the cooling capacity of the engine's radiator as it is blocked by the hot A/C cooling fins.
Just dropping a gear and taking foot off gas pedal a bit works much better on turbo engines, diesel or gas.

If you can't overheat them on the downhill and then long climb from Barstow Baker to Vegas at 110-130F, they probably aren't going to overheat anywhere except truly ridiculous temperatures.

Folks who tried turbo engines at full throttle and too high a gear used to litter the sides of I-15.
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  #23  
Old 10-01-2014, 07:37 PM
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Re: Overheating?

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Originally Posted by lstowell View Post
Just dropping a gear and taking foot off gas pedal a bit works much better on turbo engines, diesel or gas.
Best advice. Higher RPMS allow the engine to pump the heat more quickly out of the radiator and out the exhaust. If you guys would get an ODB2 guage like the Scanguage2 and use it to monitor EGT, you would see the high temperatures generated by lugging the motor.
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  #24  
Old 10-02-2014, 12:33 AM
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Re: Overheating?

For a (light) tow vehicle I still think this Jeep is one of the best alternatives out there. My biggest complaint is the 6-cyl diesel really doesn't give a lot of compression breaking.
The paddle shifters are invaluable in the mountains, however, to avoid lugging when climbing (Sport mode helps, too), negotiating tight turns, and to retard descent (as much as you can).
Mileage-wise, I've gotten 18 mpg towing on the freeway and 16.5 mpg in the mountains which makes me a happy camper!
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