I have been tuning on this car for about a year now and getting real close to having the tune to what I feel is right. My question is and may not be a problem but I need to ask. B1 O2 reads 70 to 900 volts, B2 reads 300 to 900 volts. B2 volts will not go lower than 300, is this a problem or not. The LTFT are almost 0 on both sides, I also use a W/B and it also reads a good AFR. Now I have changed O2's from one side to the other - no change, I also changed injectors from one side to other - no change. Checked and double checked header bolts for leak, exhaust for leaks - none. Should I worry about the volt difference.

 

At what rpm ranges are the B2 O2 ranges at 300 mv ? Or is it always ? . At that time are the injector PW's slightly different ?? (B2 right side compared to left) . One thing to look at is a data log when you are in DFCO and the injectors PW= 0. At that time the O2's should both read below the 40-50 mv range. Since you swapped the injectors that eliminates a leaking one. If the B2 still reads high during DFCO (no fuel) then most likely the problem is electrical in the B2 circuit.

 

found it, lose wire, thanks for the help.