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6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis SPONSORED BY:

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Old 10-18-2010, 07:26 PM
galaxie641 galaxie641 is offline
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Lost power and won't rev above 2500rpm

Had an interesting thing happen today. Truck started acting like the turbo quit working. It would rev to about 2500 rpm and I could floor it at that point an nothing would happen no black smoke, no downshifting, nothing. When it would hit 2500 I'd manually shift from drive to 3rd to get it to upshift. Another interesting thing is once I got up to 65mph the cruise would not activate. At first I thought a tranny problem then I thought maybe a turbo, after shutting the truck off for a few hours it of course worked flawlessly on the way to the dealer. I am not sure how I was able to get it up to 65mph kind of a combo of going down hills and working the pedal, also tried tow/haul and that had little to no effect, once at that speed it would hold but it was also running at 2K or less RPM so it wasn't hitting the 2500 mark. Any guesses on what they come up with, if anything? Truck now has 77K miles and it regened twice yesterday while pulling a trailer, I've actually cut down on them a bit now that I use Diesel kleen.

One thing I didn't do and now wish I would have is kick it into neutral and try to rev it, would have ruled the tranny in or out.
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Old 10-18-2010, 07:36 PM
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when is the last time you changed the fuel filters?
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Old 10-18-2010, 07:38 PM
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sounds like you were in limp mode. Could be a number of things. I take it no check engine lite or wrench light?

Could be EGR related to Turbo electronics, just real hard to say without any codes.
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Old 10-18-2010, 09:04 PM
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That's the thing there were no CEL's. Never done the filters since we have owned it, was going to at the oil change but ran out of time. I was wondering about filters too until it ran just fine after it was off for a while.
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Old 10-19-2010, 02:41 AM
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77000 miles on the original fuel and oil filters!!!You will be lucky to have any warranty when they see those filters.
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Old 10-19-2010, 08:48 AM
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No not 77K on the original filters we have only had the truck since about 73K. I know they have been changed because the cap on the engine bay filter had some rounded corners.
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Old 10-19-2010, 08:58 AM
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well will be intersting what the dealer says.
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Old 10-19-2010, 07:40 PM
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Got word this morning one of the turbo's is out and they are pulling the cab. Not a surprise since the truck has had worse turbo lag than our 6.0L ever did and I thought that was supposed to be improved upon heavily with the 6.4L's.
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Old 10-19-2010, 09:26 PM
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wow, you gotta pull the cab to change a turbo.....I would have thought not?
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Old 10-19-2010, 11:25 PM
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This very problem has happened to me before a couple times. When it does I turn the truck off and back on and works fine...figured it was the computer geting confused
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Old 10-20-2010, 07:22 PM
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Your high pressure fuel pump is failing, the pressure control valve or the volume control valve is sticking. When the computer commands a certain pressure but that pressure is exceeded by the pump the computer goes into derate mode because it can't control the pressure they way it wants. They always stick at 2500 rpms, then when you cycle the key you reset the strategy until it happens again.
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Old 10-21-2010, 06:21 AM
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Is this always true? Is costly to replace? Are you saying all three are not working or just one?
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Old 10-21-2010, 07:32 AM
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Covered by your diesel powertrain warranty. Pressure and volume control valves are part of the pump and not serviced separately. Can be costly if you are out of warranty.
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Old 10-21-2010, 07:47 AM
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yes, the HPFP is also a cab off repair.

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Old 10-21-2010, 01:33 PM
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Well they replaced the turbo and all related clamps, hoses etc and it drives better than it ever did. I also hear the turbo whistle now when starting from a stop which I never heard before. Will be interesting if mileage and regens change at all.
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Old 10-21-2010, 01:33 PM
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