Took a trip to the mountains for camping. I had my RV Trailer weighing 8200 pounds loaded. Trip is about 300 plus miles round trip. I replaced my 3.5 ecoboost with the F-250 and the 6.7. The 250 did great at lower speeds even on a hill, but when you go up a 6-7% grade at about 55-60 and you want to increase speed to 65-75 to pass going uphill the truck has very little power. It will increase speed very, very slowly. My ecoboost pulled much harder at that speed with the same trailer. Do these trucks since speed angle of ascent and actively reduce power for some reason? I can pass just about anyone from 0-50 it is like the trailer is not there at those speeds. After that it goes downhill fast.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o></o>
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What gear, what boost? What was rpm? What was the engine doing?

10,000 pounds or less should not slow down the truck. We need more info. If you put it in 4 th gear and floor it, even 5 th, it should yank the hitch out of your truck.

What were the engine temps?

 

Shelby, it is hard to tell from your post what, if anything is wrong. If I step on it pulling my 14K toyhauler up a 9K pass, the truck pulls hard...not neck snappping, but lots of power. I don't suppose your truck threw any codes that came and went prior to your trip? Carpet under your pedal? Might disconnect your batteries for a few mins to force the tranny to relearn. Sounds really like this could be something simple to fix.

 

Shelby,
The conditions you described do not describe how my signature 6.7 truck has pulled up inclines at max weights and varying speeds. I think a trip to the dealer might be in your future if the problem continues.
Good luck and let us know what the problem was...

 

What you described is definitely not how my truck acts while I am towing. Definitely should have it checked out, if they say nothing is wrong take them for a ride to demonstrate the symptom. Hope it is something simple.

 

I pull the around the same weight every day with mine and on the highway at 70 on a 6% grade the truck stays in 6th gear. I would bring it in as well. Good luck!

 

I am traveling and don't have my regular computer. I have a vid on my droid phone of the dash when pulling a big hill. If anyone is familuare with AZ, it is the hill comming out of Campverde on 260 goint to 87. It might be a 7% or better at one point. It is a little shaky tring to drive and record! RPM stays at about 2700 and the boost guage moves a little but stays neer the middle can't read the number. Temp moves to about 3/4 then comes down to a little over half. MPH stayed at 65 no increase. Truck was floored. I was in tow haul mode, did not see the gear. Again the truck will about pull the coupler off the trailer from 0-50, but after that not so good. MPG on the round trip was 10.0. I thought it would be better.

 

Maybe your HPFP is starting to fail?

j/k have a good day.

 

Change your fuel filters ,I'm 99% sure this will fix your problem.

 

Not sure if anything is wrong here; remember that your EcoBoost had only 35 HP less than your new F250, but it weighed a good 2,000 lbs less. I would bet that with the weight difference the EB would pull just as hard with that kind of trailer as your new 6.7L PSD.

Otherwise everything seems fine from what you describe. Boost should stay in the middle of the gauge, and the temp likely came down when your cooling fan kicked on. Note that the cooling fan takes lots of power, and maybe this explains your issue.

 

Ya, I guess you could have reached the limit. Everything seems right as long as your temp was 240 or less on the oil temp. There was a guy that hit 270 and this caused the engine to cut power in order to protect itself.

Wouldn't hurt to do the fuel filters, check the air box/filter, and all the hoses to make sure nothing is leaking air under the hood.

Try manual mode on the trans next time, you'll know what gear you are in and can feel what happens without the variables of the auto trans. 2200-2700 rpm is really the sweets pot on the motor, that's the strongest pull you will get.

 

Was the truck doing an active regen? The 6.4 would limit power to keep the exhaust gas temperature from going too high, which would mean about 10 mph less on the same hill with the same trailer, compared to when the truck was not in regen. I haven't noticed any power loss in regen with the 6.7, but haven't yet been on a steep hill towing while in regen.

65 mph on a 7% grade towing 8,000 lbs doesn't necessarily sound like there us a problem.

 

A properly working 2011+ is not affected by an active regen that I've noticed.

 

X2 here as well.

Shelby-GT-500,
Now that you posted more info, that is just about what I do on that type of grade. My trailer is 10k empty rolling on dual tandems. I think it's all good, especially since we have 3.73 gearing.

 

Not Funny! Well maybe a little!