Bank 1 and Bank 2 Lean... Please help

[phillymscott]

Ok let me explain, my check engine light is on and it says Bank 1 and Bank 2 are lean. Now let me tell you what all I've done. Cleaned my MAF, Replaced the fuel filter, Replaced the air filter and I replaced an 02 sensor a while ago. When I replaced the o2 sensor the computer told me exactly which one to change, therefore I don't think it could be that. I've talked to 3 different very experienced car guys and each have told me different things- an o2 sensor, intake manifold gasket, air hose leak. Anybody had this happen to them and they couldn't figure it out?

 

[2000StreetRod]

intake manifold gaskets

Very common during cold weather for the SOHC V6 due to leaking upper and lower intake manifold gaskets. See Lean condition procedure

 

[koda2000]

most likely intake manifold gaskets, but could also be a pretty big vaccum leak like from a cracked PCV elbow or intake tube. both problems are common on this engine.

 

[phillymscott]

Well I have the ohv valve but both points sound valid to me

 

[masospaghetti]

Ohv engine has the same issues with the upper plenum o-rings. Very common, not too difficult to replace but plan to struggle a bit with the egr tube.

 

[glockman]

Good luck. You'll need it.