Lacking Power - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 04-12-2009, 08:17 PM Thread Starter
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Lacking Power

I have an 08 F350, stock! I have noticed that it feels like I am pulling a load all the time! The power seems to have disappeared, the fuel mileage gone down, and pulling about 30lbs of boost under normal acceleration. The truck has 16,700 miles on it. I pulled a trailer on a recent trip. When I left home the truck was fine, during the trip all of these changes come about! I have had the issue fixed with white smoke and poor power on acceleration but it did not fix this problem. I have also replaced the fuel filters, air filter, and use Ford's Cetane Boost! Truck just feels like I am pulling a 10,000 pound trailer all the time! Any help or ideas?????

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post #2 of 8 Old 04-13-2009, 04:24 AM
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Originally Posted by raefird View Post
I have an 08 F350, stock! I have noticed that it feels like I am pulling a load all the time! The power seems to have disappeared, the fuel mileage gone down, and pulling about 30lbs of boost under normal acceleration. The truck has 16,700 miles on it. I pulled a trailer on a recent trip. When I left home the truck was fine, during the trip all of these changes come about! I have had the issue fixed with white smoke and poor power on acceleration but it did not fix this problem. I have also replaced the fuel filters, air filter, and use Ford's Cetane Boost! Truck just feels like I am pulling a 10,000 pound trailer all the time! Any help or ideas?????

Thanks
Are you going into regen? Kinda sounds like something is plugged up in the DOC/DPF. The truck should go into limp mode when this happens. A wrench light should come on and engine power is limited. Just maybe the self diagnostics are not working properly.

Brad

2008 Ford F-350 XLT CC, LB, DRW, Job1 updated to Job3, 4.10 gears, 6.4L Powerstroke, White/Pueblo Gold, DeeZee Stainless steel elite cab boards, Spartan tuned(150dpf enables, 150, 210), Flo-Pro DOC/DPF delete AFE Pro Guard 7 both from Cobb's diesel
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post #3 of 8 Old 04-13-2009, 02:01 PM Thread Starter
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It is not in regen and I have had no lights on the dash! The truck actually runs as good if not better when it goes into regen. Talked to Ford mechanic this morning about the problem, he just shook his head and said "maybe a light will come on so we can fix it"! I asked about checking the exhaust flow or checking the DPF, he said there was no official way to check it other than measuring exhaust gas temps before and after the filter!
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post #4 of 8 Old 04-13-2009, 02:21 PM
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Originally Posted by raefird View Post
It is not in regen and I have had no lights on the dash! The truck actually runs as good if not better when it goes into regen. Talked to Ford mechanic this morning about the problem, he just shook his head and said "maybe a light will come on so we can fix it"! I asked about checking the exhaust flow or checking the DPF, he said there was no official way to check it other than measuring exhaust gas temps before and after the filter!
They can check exhaust back pressure. I can see it on my Dashdaq, so I am sure they can see it as well. Make a big stink about it, and maybe the Ford field service engineer will come and hook his laptop to it and find the problem. Could just be a sensor out of whack

Brad

2008 Ford F-350 XLT CC, LB, DRW, Job1 updated to Job3, 4.10 gears, 6.4L Powerstroke, White/Pueblo Gold, DeeZee Stainless steel elite cab boards, Spartan tuned(150dpf enables, 150, 210), Flo-Pro DOC/DPF delete AFE Pro Guard 7 both from Cobb's diesel
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post #5 of 8 Old 04-13-2009, 04:22 PM
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I agree with Greenhorn sounds like a DPF related issue to me. I pulled by Bronco on a trailer do some work on it and after that my truck ran like crap took it to the dealer and they just reflashed it, same thing, always felt loaded and would hesitate at 1900 rpm's. Dealer said "wasn't getting good regens", but I always drove them out and have never cut it off once it started regen... So, I finally got a spartan and lost the cat/dpf and all is well! She runs like a champ now... I had 15k on it at the time... hope you get it figured out

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post #6 of 8 Old 04-13-2009, 07:06 PM
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check your e-brake... j/k sorry had to say it

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post #7 of 8 Old 04-13-2009, 07:40 PM
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check your e-brake... j/k sorry had to say it
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post #8 of 8 Old 11-02-2016, 08:58 PM
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I've had similar issues with my 08 F350. I did remove the CAT/DPF and used the DPF R 4+ to remove/clear the regen code. When I'm towing my 8000 LB trailer up any kind of hill the performance goes to hell. During my last camping trip I did get a P0234 code (engine overboost) and the engine went into limp mode. I didn't have any over temp readings, once I was able to clear the code everything was fine until a hill came up and I was forced to really watch my boost pressure. I've also noticed that when going up steeper hills and not towing, the engine requires almost 30+ psi boost to make any real power. That can't be normal...any ideas
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