In the absence of vacuum leaks, using flow-matched/balanced injectors, plugs/wires good, no misfires detected (Tech II Scans), etc., what could cause:
From scans:
O2 sensor readings to be way off from bank to bank. In some cases, bank 2 reads 0 while bank 1 is reading about 900mv, but not all the time.
Injector pulse width is off with differences between 1 to 2 points (Bank 2 higher than bank 1).
LTFT's are 0 to -8 on Bank 1 and as high as 25 on Bank 2.
SFTF's also showing even larger descrepancies between banks.
Besides a lame Bank 2 O2 sensor, any suggestions on where to focus attention to resolve this?
Car is a Corvette with a 427, LSX/90mm LS2, AFR 225 heads, cam, Supercharger with 72lb (Low Impedence) injectors.