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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 April 7th, 2015, 12:42 AM
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lmatthysse lmatthysse is offline
 

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Exclamation towing problems

First time poster, new to this format. I have an 05 350 crew, 6.0. less then 40K miles. Turbo was serviced in the past and upgraded turbo half installed. Runs fine until I purchased a 5th wheel and towed it home. on long uphill grads it would intermittently start making a fan rev'ing up sound and I would lose speed. Turbo boost look strong @ 20-25 at 3k rpm but once on one of the last times it happed bad, I saw the boost drop to 0 for a short bit before snapping back. Once over the crest of a rise and the throttle let up, the fan sound would usually fade and the drive would engage normally. As it got worse and persisted, I would pull over for a minute and shut down and restart and run strong till another hill load, but mostly the longer hill loads would make it go. I fear the worst.
  #2  
Old April 7th, 2015, 06:48 AM
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What are the rpm's doing when this happens (assuming automatic trans)? Again assuming automatic, are you using tow/haul mode?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #3  
Old April 7th, 2015, 09:11 AM
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a friend had the same on his F450 6.0
got a new turbo and all has been fine
they told him that since he doesn't drive it much the vanes got stuck and would not open or close all the way


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  #4  
Old April 7th, 2015, 12:05 PM
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It would happen in tow haul and not in tow haul. RPMs would hold at say 3000 rpm but the speed and power fell off.
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Old April 7th, 2015, 12:06 PM
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The weird aspect was the sound like a fan reving up when it would happen.
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Old April 8th, 2015, 09:08 AM
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I think that was from using engine only and higher RPM's


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  #7  
Old April 8th, 2015, 05:42 PM
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less than 40K on an '05? geez! she needs to be driven!

do you have any way to monitor the vitals or pull any codes? like a scangauge or tuner?

how big of a trailer/ and what kind of grade was the hill?

Aaron

'95 F150 XLT, reg cab long bed, swapped 351w,
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