Ford 7.3 Low/No Boost/HPOP?

NitroJoe

Member
Joined
Feb 1, 2025
Messages
31
Reaction score
4
Location
Ft. Lauderdale, FL
Hello army!

I need a few second opinions before I start down the next rabbit hole.

Story behind truck: Bought from a negligent owner who performed no maintenance. Oil leaking everywhere. 350K on dial. No idea on what if any parts were changed.

Here is what I did to correct the truck before we get to the point:
  1. Rebuilt turbo (360 bearing, WW, new 1.0 ex housing)
  2. Turbo pedestal with delete and resistor in plug.
  3. New bellowed up pipes
  4. New IPR, new ICP (ford or equivalent)
  5. New LPOP
    1. Reservoir was slowly bleeding down overnight
    2. Cleaned everything, cleaned check ball in block under housing
    3. New gaskets for oil reservoir housing, HPOP, and fuel filter housing
  6. CNC line kit as well for HPOP
  7. 6.0 intercooler, new boots, all cleaned
  8. PCV reroute to filter and reinstalled back to intake
  9. Oil Cooler rebuild (ford parts)
  10. Coolant flush
  11. Oil change 15w40
  12. Bypass oil cooler installed as well (Amsoil)
Now what is happening....

No boost/Low boost - like nothing, at WOT I might see 5 lbs occasionally, but I have to really force it (like a race car). Takes over 1/2 mile to even get that much at WOT
She idles well, no surging, no loping.
Bit of a hard start, way better after I replaced LPOP, verified oil in reservoir

Autel scanner while driving
RPMBarometric PSIExhaust Back Press
PSI
Inj Contr Press 1 PSIInj Contr Press 2
PSI
IPR %
68014.9516.1547448123.8
64514.9516.4450755924.6
140014.9516.88755.65730.9933.59
160014.9518.69839.77858.6235.93
181914.9518.791109103848.43
258214.9523.321430138656.64
307614.9529.041649169463.28

The truck DOES report a P1211, but nothing else.

Here is additional troubleshooting I performed:
  • Verified oil level in resoivior
  • Verified fuel pressure (riff raff gold spring) is showing 75PSI, on list to change to silver
    • Test also performed under load and WOT, no change 75 PSI
    • Should also rule out tank issues (although I do have a frame mounted filter no debris)
  • Pressure tested charge side of turbo fixed any leaks, intercooler good.
Based on the troubleshooting, chart, and research here is what I am thinking.....

  1. Map sensor is bad, value should be changing some
  2. Possible bad oil?
  3. P1211 Could be a ton of things but
    1. leaning towards weak HPOP
    2. possible bad injector O rings, oil bleeding past?
Let me know what you think.

Thanks in advance,

NitroJoe
 

Latest posts

Members online

No members online now.
Top