Engine Codes P0171 and P0174

[Speedyrebuild]

Need help on this one. My 98 Ranger with 3.0L CEL came on and had codes for lean bank 1 and lean bank 2. I have monitered the o2 sensor PIDs and my long term fuel trim hovers around 20% all the time while the short term is between -2.5 to 1.0. I have checked for vacuum leaks and have none, fuel pressure is 42psi and does not drop under load. I can't beleave the o2 sensors are bad they are both switching. Anybody out there have some ideas?

 

[reggioisme]

try cleaning your maf

 

[adsm08]

3.0's are usually good for lower intake gaskets. Did you smoke/break clean check them?

 

[snake]

Fords are really bad about PCV hoses, particularly the rubber elbows, sucking in and ripping. That creates a vacuum leak. I agree on above, if there's no vacuum leak, clean the maf.