Mechanics

F150 ENGINE RUNS ROUGH

2002 Ford F-150

Engine Performance problem
2002 Ford F150 V8 Four Wheel Drive Automatic 205000 miles

My engine is throwing a code (lean on bank2). It seems to be running a little rough between 1200 to 1600 RPM's (it is not as noticable at higher RPM's). I have recently changed the fuel filter, sparkplugs and 2 COP's. I have check my fuel pressure and it is only 32psi instead of 55 psi. I have hooked an OBD-III to read the codes and the freeze data shows that my LTFT% is around 24 to 27. Any ideas with this problem will be gratly appreciated
Avatar
Brwhiteman147
June 9, 2010.



Sounds like the fuel trim is about right for a vehicle running with a lean condition and low fuel pressure.

Take vaccum line off of fuel pressure regulator. Does pressure come up? Notice fuel leaking out of fuel pressure regulator? If that all seems good next thing to do is change fuel pressure. After that its time to start looking at pump output

Blackop555
Jun 9, 2010.