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Old 02-17-2011, 02:36 PM
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Performance question

Hi,

I recently purchased a used 2006 F350 Dually, Lariat, FX4, 6.0 diesel with 4.10 gear ratio. The truck has 150,000 miles on it. I know the bad reputation of this motor and only bought it for the following reasons: Its in like new condition, purchase price was half of book value, and I purchased an extended warranty.
The mpg gauge says it gets 11.2 mpg. Seems pretty poor to me. I have hauled a few different large goose neck trailers with it and it seems kinda gutless. My 1999 f250 with 7.3 diesel with a chip will run circles around it and out pull it.
The 2006 does not blow any black or white smoke that I have seen. When its loaded it takes almost all of the pedal to do 70 mph. There is little pedal left at 70 and essentially no pickup after that. I have changed all oil filter using a ford filter etc. I have also changed both fuel filters using ford filters. The air filter as been cleaned as well
When I first got the truck I tracked down the previous owner and he told me the only problem he ever had was the injectors (with in few first few thousand miles). I had not pulled anything with it at that point.
I talked to my wife's grandfather who had one of these trucks. He said he thought he had to have his reprogrammed a few times at the ford dealer. He also told me he pulled his 32 ft fifth wheel as fast as 97mph with his 6.0...........

Does any body have any thoughts as to whats up with my 6.0? The truck runs great but just don't seem to have the power. The turbo psi gauge gets up to about 30 max when I'm towing.

Thanks for any thoughts
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Old 02-17-2011, 02:48 PM
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Quote:
Originally Posted by jgilpin View Post
Hi,

I recently purchased a used 2006 F350 Dually, Lariat, FX4, 6.0 diesel with 4.10 gear ratio. The truck has 150,000 miles on it. I know the bad reputation of this motor and only bought it for the following reasons: Its in like new condition, purchase price was half of book value, and I purchased an extended warranty.
The mpg gauge says it gets 11.2 mpg. Seems pretty poor to me. I have hauled a few different large goose neck trailers with it and it seems kinda gutless. My 1999 f250 with 7.3 diesel with a chip will run circles around it and out pull it.
The 2006 does not blow any black or white smoke that I have seen. When its loaded it takes almost all of the pedal to do 70 mph. There is little pedal left at 70 and essentially no pickup after that. I have changed all oil filter using a ford filter etc. I have also changed both fuel filters using ford filters. The air filter as been cleaned as well
When I first got the truck I tracked down the previous owner and he told me the only problem he ever had was the injectors (with in few first few thousand miles). I had not pulled anything with it at that point.
I talked to my wife's grandfather who had one of these trucks. He said he thought he had to have his reprogrammed a few times at the ford dealer. He also told me he pulled his 32 ft fifth wheel as fast as 97mph with his 6.0...........

Does any body have any thoughts as to whats up with my 6.0? The truck runs great but just don't seem to have the power. The turbo psi gauge gets up to about 30 max when I'm towing.

Thanks for any thoughts
I would not re-flash it. Custom tuning will give you hp and mpg. it is a dually with 4.1 gears, you mpg will stay low even with a bunch of upgrades.
150,000 miles im sure you intake has allot of build up from the egr system.
I would pull the egr valve and have a good look in there.
Put some Diesel Kleen from wallmart in the fuel. How does it start cold?


:EDIT:
Deleting or modifying the egr will help your truck. Look at my sig for modifying the egr system if you do not want to buy a delete kit. You can delete it for free on your own, but some like to put money towards a kit.

Last edited by smokersteve; 02-17-2011 at 02:56 PM.
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Old 02-17-2011, 02:52 PM
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If your wifes Grandfather pulls at 97mph then he has some sort of tuner/programmer on the truck.
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Old 02-17-2011, 02:53 PM
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It's a little bit ruff at first when its cold but it clears up real fast. The colder the weather the ruffer idle when first fired off.
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Old 02-17-2011, 02:55 PM
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Originally Posted by jgilpin View Post
It's a little bit ruff at first when its cold but it clears up real fast. The colder the weather the ruffer idle when first fired off.
What temps and what engine oil?

Also, the 7.3 probably has SRW and a smaller gear ratio.

Getting cat delete pipe and or a muffler delete pipe will help with towing.

Last edited by smokersteve; 02-17-2011 at 03:00 PM.
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Old 02-17-2011, 03:00 PM
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I started it today its about 60 degrees out and it was ruff for about 2 seconds. I started it when we were down in the teens and it might have been ruff for a second longer but I had the block warmed plugged up. I have never seen it blow any white smoke when first fired off.
I had intended to put an egr delete kit on it. However, I talked to a local mechanic and he said that he always sees more problems after people install delete kits.
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Old 02-17-2011, 03:02 PM
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It may be because of the codes the delete will cause. Custom tuning will fix that. Even if you dont get it for HP. A tune for the trans and egr will help you.

The way I modified my egr system is to act like a delete, but with out the permanent codes.
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Old 02-17-2011, 03:06 PM
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the 7.3 is a single rear wheel with 3.73 gear ratio. I expected the 6.0 drw to be able to do more 70 mph loaded. Is that how all these trucks perform factory standard?
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Old 02-17-2011, 03:09 PM
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Depending on how much you are towing, you should have no issues of getting up to that speed at all. I pull a 10,000lb 5th wheel and I can go WELL above 70mph if I wanted to on stock tuning.
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Old 02-17-2011, 03:16 PM
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I have not any thing even extremely heavy yet with the 6.0 It runs really good and sounds great but just lacks the power with towing. Can't find any leaks or any thing like that either. 70 is about all it will do with a load unless i'm going down hill. I guess I will rum Diesel Kleen through it.
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