My son put a 5.4l crate engine in his 2004 F-150. It's never run right and so I'm trying to help him out. It keeps throwing a P0012 code.
We've replaced the cats, coil packs, VTC sensor on bank one, and some other things but it still throws that code.
Attached is a log file at idle, 2000 rpm and 3500 rpm.
Fuel trims are odd, among other things. Any Ideas?
Thanks.
21-08-05 -- Idle-2k-3k.hpl