2004 F150 5.4 high calculated load, low power

[Luftmasse]

Can you post some scan data? Include RPM, MAF, Calculated load, both rear o2 sensors, STFT and LTFT. One at idle and one at full throttle.

My gut feeling is a bad MAF. Any restrictions on the intake side?

 

[Trav]

I haven't smoked the intake. There is no EGR on this truck - I can and probably will check the vacuum lines, but trims are good at idle and idle quality is actually pretty good, so I'm not expecting to find much there.

EGR delete or it didn't have one OE? I have no idea the truck is alien to me, the last one I had anything to do with was a 5.4 2v so I am looking at this generically. I would be tempted to drop the pipes off the headers and see if there is any improvement.

 

[D60]

Also what's the axle ratio? Is it a 2.73 or some other absurd ratio. The one that works well is the 3.55.

He addressed that in Post #5

 

[Luftmasse]

EGR delete or it didn't have one OE? I have no idea the truck is alien to me, the last one I had anything to do with was a 5.4 2v so I am looking at this generically. I would be tempted to drop the pipes off the headers and see if there is any improvement.

They had completely eliminated the EGR Valve on the 5.4L for that year model.