Lean fuel in bank 1 put a new PCV valve on?

CAM61

MEMBER
1999 FORD F-150
4.2L
V6
2WD
AUTOMATIC
172,000 MILES

The truck listed above is an XLT. Engine light came on obd code lean fuel in bank 1 put a new PCV valve on. The truck started acting rough when idling and cutoff, it would backfire and act like it wasn't getting any fuel. I have put a new fuel filter, air filter, MAF sensor and alternator (battery light wouldn't go off on dash battery wouldn't hold a charge. Battery is fine per AutoZone. Still having the same issues. Fuses and relays checked also. Any help would be appreciated. CAM

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,505 POSTS

It sounds like you have a weak fuel pump, here is how to check the fuel pressure so we can confirm the issue. The battery light problem you need to start a new question for because we only handle one problem per thread. Here is a guide to help you check the pressure and you can rent a fuel gauge for free or cheap from the local auto parts store.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Engine Running .................... 193-310 kPa (28-45 psi)
Key ON Engine OFF .................... 240-310 kPa (35-45 psi)

This guide may help as well

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Check out the images (below). Please let us know what happens.

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