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Ford Truck Club Forum > FORD F-250 | F-350 SERIES | SUPER DUTY > 1999-2007 Ford F250 | F350



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  #1  
Old February 11th, 2011, 08:00 PM
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Default 1999 f350 powerstroke power loss

1999 f350 7.3 powerstroke, getting major loss of power when going uphill either with or without a trailer, max or 15 -20 mph, seems that it doesn't know when to shift. need answers.
  #2  
Old February 12th, 2011, 09:13 AM
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so many items to cover as fuel, exhaust, ignition
is the CEL on ?
did it just happen or has it been getting worst ?


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  #3  
Old February 14th, 2011, 05:23 PM
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started about a year ago, we had it serviced and the said there were some pressure problems with the turbo so they changed out some fittings and tightend everything up including 2 fuel lines that were leaking, I could break out the bill for more detail, they also said the tranny needs to be serviced, after that it ran fine until about 2 weeks ago, it started doing it again, the tranny still hasn't been serviced and its due for the fuel filter to be changed also.

also not sure what the cel is
  #4  
Old February 14th, 2011, 05:28 PM
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and the check engine light is not on.
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Old February 15th, 2011, 08:13 AM
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Sounds like trans slippage to me.




  #6  
Old February 15th, 2011, 08:43 AM
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do the tranny & fuel filter and see what happens

there are a couple of options on the tranny
dealer flush, usually without filter change
DIY fluid & filter change at home, this will require more work on your part, which involves more than just dropping the pan

can provide details for the DIY flush if needed


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Last edited by JSoko; February 15th, 2011 at 08:47 AM.
  #7  
Old February 17th, 2011, 08:21 PM
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but if it was trans slippage wouldn't it be doing it all the time not just on hills?, or is that just when its most obvious when its under a load?
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Old February 17th, 2011, 08:23 PM
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yes info on the DIY flush would be helpful.
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Old February 18th, 2011, 12:18 AM
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2 things I've noted are practically a must for the 7.3's.

1) Pyrometer, you NEED to know your temps especially if you have a tuner
2) Boost gauge. Helps verify your getting your 18# average boost.

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  #10  
Old February 18th, 2011, 12:32 AM
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check your fuel bowl for leaks its comon on the 7.3L and it will really kill power if its leaking.


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aldrinmaclarens29 , ASwaff400 , Bates88 , bruewayne , cootersbigblackford , DIXIE FIX , DoubleDee , herbz , JSoko , Klitch , nine5flareside , Russo2 , sbellinghausen , tcasebeer , whitesleeper , Willows Wind

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1999 , f350 , loss , power , powerstroke

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