Mitchell62290

Dear Ford men,
Okay, truck was running bad, if I remember correctly, bank 2 was popping up, did some research, cleaned the MAF sensor, things were good for a while, bank 1 popped up, did some research and replaced the dirty stock PCV valve.

It had a strong vacuum, so there were no leaks. I turned the warning light off and I though all was good, sure enough, not all is good. It's still reading the same warning.

Any help guys??

Tackle

Looks like you're on the right path! A little confusion as to if it was bank 2 or bank 1 initially will make things more difficult to troubleshoot. The same bank causing lean codes is different than both in terms of troubleshooting.

Yes, a dirty PCV will cause a lean code. How about the tube it's attached to? The bend at the firewall is known to crack and cause a lean code.

Also, leaking intake gaskets could be the cause - if it was only a certain bank I would have a higher suspicion this is the problem.

Could be an exhaust leak as well.

Low fuel pressure also causes lean code. Check the fuel rail schrader valve if you have a gauge. Should be at 35psi

Mitchell62290

Jeez, that's too much information to take in. lol. It's definitely bank 1. But like I said, when I replaced the PCV valve it had a good strong vacuum. So I'm thinking it's not the tubing...