Hello everyone. I have a 2003 f150 5.4l 2v. I have a lean code on bank 2 and I can't find the vacuum leak if it is a vacuum leak. Here is what I replaced so far. 1. Intake manifold w/ new gaskets and hardware.
2. All 4 o2 sensors.
3. Vacuum lines that I seen were worn.
4. New fuel filter
5. All 8 fuel injectors.
6. All 8 spark plugs and coil packs
If anyone can help me figure this out I am stumped.

 

Do you have an exhaust leak on that side before the upstream O2 sensor? Have you checked the PCV elbow behind the intake for rot and cracks?

 

no exhaust leak on bank 2 before the upstream o2 sensor. Pcv elbow if fine no cracks no rot. That's part of the hoses I replaced just in case. I did a little research to common issues to check. After I replaced the 2 downstream o2 sensors last night I cleared my codes and the only thing that came up going to work this morning was misfire on cylinder 2. My STFT1 and STFT2 is between -3 and +3%. My LTFT1 and LTFT2 is sitting at 14%. Then when I do a mission check it says something went wrong with egr and evap syatem

 

What brand spark plugs and coils did you use?

 

Motorcraft spark plugs and Motorcraft coil packs

 

Can you be more specific with details?

 

This is what pops up.

 

Those should be throwing numeric codes........

 

Glc... There lies the problem, its not throwing any numeric codes. The only code that come up is p0174 and misfire on cylinder 2. I tested it this morning.

 

Glc... There lies the problem, its not throwing any numeric codes. The only code that come up is p0174 and misfire on cylinder 2. I tested it this morning.

 

I don't know if you figured this out yet, but the egr can get carboned up and if it's not closing cause a lean condition and misfiring.

But onto the problem I had that I figured I would mention is I used to get random lean codes until one day I smelt coolant and noticed that there was leaks by the coolant crossover. Ended up being the plastic corroded around the oring and broke away the plastic and cracked the manifold just enough to cause lean codes.

Did you happen to remove the cross over and look at the plastic where the o rings seal? because I know you can remove the manifold and change gaskets without removing the crossover.

Here's a thread that is exactly what I'm talking about.

https://www.f150forum.com/f6/cracked...nifold-289173/