I'm at the end of my rope boys..... I just returned from deployment overseas, excited to get in my truck and ride with the windows down..... Only to find it losing power when I accelerate. It will slowly gain speed but it seems to have no turbo/boost. So I start down the road troublehooting.
I have pulled the EGR valve and it was clean
Checked Map hose, cleaned port on intake
Changed the ICP
Changed the IPR
New Powermax turbo
VGT learn done
New batteries
New DC power 250
Pulled the EBP sensor and cleaned. Even tried it unplugged
New fuel pump
New FICM with Atlas 40 from ED

Truck is 2003 6.0L Ex 163k
New ARP studs/gaskets/
Has a tune but also ran it in stock; no change
Flushed and filled with CAT ELC
Has new BPD oil cooler relocate behind passenger batt

So for my scan gauge numbers....
My deltas are good; 201/196

When I pull out, and normally drive my IPR will do 86.7 in the throttle but ICP won't go above 15-1700. If I floor it the IPR will jump to the 86 but the ICP drops to 700-800 and it's obvious the truck just doesn't have power. It feels like everything is working. Turbo spools and it acts like it wants to roll coal.... But it won't. That ICP drops and she falls on her face.

I ran the SCT code and usually don't get anything except the 1000 which isn't anything. I once got a P0278 and P2623

I even tried another ICP today. The pigtails were clean and I had already swapped them last year.

What else ???? It starts fine. So it shouldn't be the HPOP but that's all that's left really. When I do start it, it starts right away but sometimes will kinda rev or run into the start. Either way of all the troubleshooting steps it seems normal. I just don't have the power.

Of all the searches on the forum and online I have found folks that explain the same symptoms but never post back as to what fixed it. One thing I also aim to do is have the "solved" for this to be added to our posts for guys in the future.

Sorry for the long winded poast.....I know knowledge is power so I wanted to list everything.

Fire away.....

 

I have also changed the fuel filters and oil. I have OEM plugs and caps. Archoil and Rotella oil

 

Did you clean the EBP tube and manifold fitting as well, or just the sensor?

 

No just the sensor. It looked perfect so I didn't go any further. I will go pull the tube off the manifold and check it out too.

 

What is your fuel pressure?

If that's fine, pull out the IPR and look at the screen. If that isn't clogged pull out the ICP and do an air leak test.

The 03's do have the HPOP that can fail internally, you only need 500psi to start the truck so an easy start doesn't necessarily indicate a healthy HPOP. If it's weak it just means you'll see more IPR duty cycle when starting compared to a healthy one.

 

Not a 6 oh guy but that was my first thought as well, HPOP. When I had mine drive tested, I would whack the throttle and the pressure went directly to about 2600-2800.

 

I second the air test notion. If your HPOP has taken a dive on you, check out the Adrenaline pump over the OEM if you can swing it.

2003-2004.5 HEAVY DUTY HIGH VOLUME FORD 6.0L / IH VT365 BILLET HIGH PRESSURE OIL PUMP (HPOP)

 

Hey ED! That red DC power alternator showed up and looks good! Sending my core FICM to you today. Thanks for your help

Now if I can figure out my go problem!

 

Okay updates from today.....

Made 31 psi boost before it fell flat

Fuel pressure gauge crapped on me but I was at 52 static didn't get to see it under load going down the road.

I'm going to drive it back to my father in law (5hr drive) tomorrow and take the weekend to dig deep. Sure hope I make it home!

 

Another thought from a diesel buddy there was that the braided lines at the oil rail under the valve cover was blowing off at high pressures. It's almost down to changing it to see what fixes it

 

Oh and the IPR and ICP are brand new. Screen is good in the IPR. Even tried the ICP again just to see if it was a lemon. I have another IPR valve I can try too but I want to see my fuel pressures under load.

 

Ed I'll call you if I need the pump.

 

Updated numbers:

WOT
32 psi boost
IPR:86.7
ICP26

But I saw my MAP drops to 3.3!!

MAP sensor???? The hose and nipple are clear but maybe the map sensor died??? Thoughts?

 

ICP was 926

 

I don't know the values for the 6.0 off the top of my head, however on my 7.3 the ICP is 508-520 idle engine warmed and 2850ish floored (I have a weakening HPOP). I'd imagine you should be breaking at least 2500 if your HPOP was in good shape.

Quick search yielded pretty much the same results across the board...

Cold engine low idle ICP = 806psi IPR 29%
A: Cold engine high idle ICP= 960psi IPR 33%
A: Warm engine low idle ICP= 585psi IPR 24%
A: Warm engine high idle ICP= 735psi IPR 28%