At 5000 RPM in neutral, bank 1 (driver side) and bank 2 show different AFR and it's almost 1.0 difference. I haven't data logged yet, but is it ok?

 

Under low load, especially no load, the driver side is always going to be leaner due to the plenum/intake design. As long as you don't see a big difference under load you're fine.

 

I've seen the same as well.

 

i've seen about .5 difference.

 

Thanx for reply. I better data log and see any difference under load.

 

Why not install dual widebands to monitor each bank individually??? Then any significant difference under load would be immediately noticeable??? Just my2c

 

He obviously has dual wide bands already or he wouldn't have started this thread.

 

thats what I was thinking.

 

hahahaha. yep.

 

What I think you have is a lazy O2 sensor on bank 2
that is starting to give up!

Check your data logs and see if the ecm is adjusting the A/F
corrections at nearly the same time. you might find that bank 2 stays longer at one value as bank one is moving around to keep it at 14.7.

Correct me if I am wrong.