The original owner 2004 Ford Expedition E.B 5.4. It is struggling to Accelerate and it's bad!! HELP!!!

[DLK1990]

The original owner 2004 Ford Expedition E.B 5.4. It is struggling to Accelerate and it's bad!!

These are the items I replaced:

• 8 Motorcraft spark plugs and 8 OEM coils replaced
• Replaced fuel filter
• Replaced Air filter
• Cleaned injectors multiple times (Chevron, STP, Seafoam etc.)
• Replaced EGR Valve (Duralast)
• Replaced ENR Pressure Valve Sensor (Duralast)
• Replaced Crank Shaft Sensor (Duralast)
• Checked hoses
• Replaced EVAC hose / green tip
• Replaced PCV and hoses (minus one in the far back)
• Replaced Airbag horn unit (horn burned out by not turning off. (Neighbors enjoyed the 3 AM horn blaring many nights until removing negative from the battery)
• Replaced Battery
• Replaced MAF (Hitachi)
• Replaced front and rear brake pads
• Replaced Serpentine belt
• Codes I could not get rid of until recently. They magically went away C1701, P0172, P0174, P0442, P0301, P0308, P0316,
• Codes that popped up P0231, P1000, and U1262
• Yesterday only
  • U1262
• The Expedition idles smoothly with no lifter noise. There’s no smoke (blue or white from the exhaust. I need help!!! I’ve taken it to two different service centers paying $185 and $175, to leave frustrated. No smoke test was performed.

 

[kep5niner]

Clogged cat? I had a similar issue and catalytic converter replacement was the solution.

 

[DLK1990]

It has pressure (exhaust) coming out of the tailpipe. If it was clogged would it be able to do that? There's no code and it recently cleared the cycle for that one. The EVAP has yet to do so... months later...

 

[kep5niner]

An exhaust shop can test the back pressure on the cats to evaluate if they’re clogged.

 

[Hamfisted]

Do you have a fuel pressure gauge ? What kind of fuel pressure are you getting at the fuel rail schrader valve ?
You should see 45-55 psi with the key ON.



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[DLK1990]

I've attached the data files. Does anybody know what the numbers represent?

 

[Hamfisted]

I've attached the data files. Does anybody know what the numbers represent?

Means I need stronger glasses....

But the fuel trim numbers look fine.






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[DLK1990]

Do you have a fuel pressure gauge ? What kind of fuel pressure are you getting at the fuel rail schrader valve ?
You should see 45-55 psi with the key ON.



.

How do I do this test?

 

[Expd830]

Have you cleaned the throttle body?

 

[DLK1990]

I've cleaned the to throttle body using the appropriate cleaner. It was dirty, and frankly it could be cleaned more. What about Fuel Pressure Regulator?