2004 F350 6.0 power loss problem

[Tankerdude]

This truck has 94,000 miles on it.
Regular maintenance front to back.
No aftermarket junk other than intake and exhaust.
No smoke of any color.
Good, strong puller. Until...

This truck seems to have developed a loss of power situation, and no dealer can seem to find the problem.

EGR replaced at Guymon, Ok. dealer.
Throttle body replaced at Trinidad, Co. dealer.
All diagnostics run clean.

This is the same truck that has pulled the same travel trailer into the highest elevations of interstate highway in Colorado and New York.

Now it can't seem to get out of it's own way.

What gives???

[fordmugg]

id like to know too

[baja350]

Sounds like the same thing I have going too!
I had a post called Turbo cuts in and out, and they said look at the ebpv.
let me know if you figure anything out, I am hosed down here!

I live down in Baja, and my 99.5 F350 (which has been running perfectly for 160,000) all of a sudden is having a power problem. At times the turbo works just fine and then it will just stop mid drive. Truck still runs, but w/o much power. Miles later and some worries, and it kicks back in??

Symptoms:
-Starts up just fine
-no turbo whine
-no turbo kick in power
-shifts gears later
-no smoke
-no fluids dripping
-no check engine lights

What I have done in the last 2 days:
changed oil and filter has 10W-40
changed air filter - was pretty fouled
changed fuel filter - was pretty fouled
drained the water out from the little thingy by the fuel filter

[F550Haulin]

Pretty strange that they can't find anything wrong with it if it doesn't have any power. You might have an injector or two going bad. If they are weak the Ford dealer told me they couldn't find them until they went bad and quit firing. Have you ever had injector problems?

[Tankerdude]

The dealer in Trinidad, Co. told me that the #8 injector had what he called "continuation", or something like that.

Since the truck was there overnight and was obviously cold the next morning, that he ran the diagnostics again. His feeling was that if any injector was having a problem, it would show up then.

After reading lots of other posts, I decided to try unplugging the ebp sensor. This stopped the computer from trying to make backpressure, which stopped the hissing sound from the tailpipe. It did seem to affect the engine a little, in that it seemed like the engine would hesitate just a little. I've since plugged the sensor back in, and the hissing is back.

The truck still seems to have a problem now and then just driving around without the trailer. I've seen no point so far in hooking up the trailer and dragging it up and down the highway just now. Being the holiday weekend, even if the truck started showing symptoms, there's nobody available at the dealer to have a look. Maybe next week.

Since my original post, I've been noticing a slight diesel smell from the exhaust. This smell is something more than the standard exhaust smell. While it's still not smoking at all, it kinda smells like there's unburnt fuel in the exhaust.

[eschaner]

Sort of sounds like the ebpv. Did you check to see if the wastegate is opening or the linkage for the wastegate is broke and the wastegate is staying open? Not to sure about 6.0's. If the turbos are the same as 7.3's. Possible bad diaphram is the wastegate.

[CHEROKEE DIESEL]

BROKEN INLET EXAUST PIPE .OR Y PIPE TURBO WILL NOT BOOST .PERFORM BOOST PRESSURE TEST .

[CHEROKEE DIESEL]

EBPV IS NOT A PART .ITS A PID READING FOR EBP SENSOR

[Tankerdude]

I have since spoken to the dealer twice. After what I think is too much pleading, I've convinced them to attach their flight recorder (when it's available) to the truck. At that point, I'll have them also install a sensor to the fuel filter on top of the engine to monitor the fuel pressure. Then I'll hook up my trailer, and tow that puppy around for a few hours to let that engine get good and hot. I hope the weather is good and hot around here that day also.

I'll keep this thread updated as to the progress.

[CHEROKEE DIESEL]

THERE IS A SHORTAGE IN FORD DIESEL MECHANICS .THEY PROBALY HAVE THE
OIL CHANGE BOY ON IT .