Loss of power and boost drops to 10psi - Ford Powerstroke Diesel Forum

6.7 Motor Problems 6.7 Motor Problems

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post #1 of 23 Old 06-21-2012, 05:36 PM Thread Starter
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Angry Loss of power and boost drops to 10psi

I've had my 2011 6.7 for 14k. Every time I load it with 9k lbs it seems to pull fine until I reach any kind of incline at higher speeds. The turbo boost falls from 20psi to 10psi and in some cases I can't even maintain the speed limit. Unmodified 7.3s pass me on hills and a dodge v10 can stick with me, all with similar loads. I took the truck to the dealer for this concern 3 times, of corse they didn't find any problems! Has anyone else had the same problem or heard of a fix for this?
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post #2 of 23 Old 06-21-2012, 05:42 PM
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This may sound stupid but.. are you using the "tow-haul" mode while you're towing?

Have you tried performing a transmission relearn? Could be that you just drive so gingerly regularly that the TCM isn't sensing the need to downshift.

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post #3 of 23 Old 06-21-2012, 05:49 PM Thread Starter
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I use "tow-haul" and I manually shift so not to be stuck in too high of a gear.
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post #4 of 23 Old 06-21-2012, 06:44 PM
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Stock or modded?

2011 6.7 FX4 Lariat
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post #5 of 23 Old 06-21-2012, 07:17 PM Thread Starter
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Stock, no mods.
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post #6 of 23 Old 06-22-2012, 03:29 AM
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post #7 of 23 Old 06-22-2012, 10:47 AM
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Any issues unloaded?

2011 6.7 FX4 Lariat
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post #8 of 23 Old 06-22-2012, 03:24 PM
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My friend owns a 2011 250 and had what sounds like the same problem. When loaded with 36 ft fifth wheel camper he would climb steep hills at about 25mph. After several dealerships telling him there were no codes so nothing to fix, he found a mechanic that had seem the same problem. It turned out to be a faulty valve in the oil pan that would not allow engine oil to flow to the oil cooler. The oil temp was climbing about 30 degrees on a long hill and then the truck would start to de-tune to prevent engine damage. All this with no codes stored. According to him the engine oil temp can be accessed on the readout screen.
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post #9 of 23 Old 06-22-2012, 06:04 PM Thread Starter
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No load, the truck seems to be running fine. The truck gets 15 mPg city 18 hwy. I fill the def every 7k give or take. I can't find anything to complian about while it's empty.
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post #10 of 23 Old 06-22-2012, 06:17 PM Thread Starter
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Quote:
Originally Posted by 2000-250-psd View Post
My friend owns a 2011 250 and had what sounds like the same problem. When loaded with 36 ft fifth wheel camper he would climb steep hills at about 25mph. After several dealerships telling him there were no codes so nothing to fix, he found a mechanic that had seem the same problem. It turned out to be a faulty valve in the oil pan that would not allow engine oil to flow to the oil cooler. The oil temp was climbing about 30 degrees on a long hill and then the truck would start to de-tune to prevent engine damage. All this with no codes stored. According to him the engine oil temp can be accessed on the readout screen.

Wow! That sound interesting. Unfortunately I don't have the ability to access that info with my truck. I do have a hand held scanner, and it doesn't have the option for displaying the eot either. I'm giong to bring the truck to the dealer again on monday, and I'll mention the oil valve to them. Thanks for the info.
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