Contour Enthusiasts Group Archives Forums General Troubleshooting Lean Bank 1/ Lean Bank 2

Alright guys, a little update on 'project CEL'. Here's what I replaced/cleaned yesterday:

LIM Gasket
Cleaned LIM
UIM gasket
Cleaned UIM
T/B Gasket
Cleaned T/B
EGR Gasket
IAC Gasket
Cleaned IAC
PCV Valve - new
EGR Vacuum Line - found split in it
Main Vacuum line off top of UIM - found crack in it
Front PCV hose
Rear PCV hose

Observations:
Car runs absolutely amazing now. SMOOTH as silk. Great idle, secondaries come in seamlessly, great pull, increased throttle response, hard brake pedal went away, no more stuttering.

However... even after all this the freakin' check engine light came back on... with the same 'lean bank 1/lean bank 2' codes. Well... at least now I have a smooth running car, and i know what is NOT the problem. No big deal... so, I figure it's 1 of 2 things... gotta be the MAF or the o2's. I still just find it highly unlikely that both o2's go out at the same time... so, I tried UNPLUGGING THE MAF. I unplugged it, and the car ran exactly the same way. I drove it 20 miles with it unhooked - and it ran exactly the same. This tells me that the MAF is the problem. The car shouldn't run correctly with it unplugged. The computer seems to be compensating for it not being there. So, I would think that is the problem? Anyone else think that is strange?