I decided to pull the plugs on the car the other day. I wasnt very happy with what I found. The entire left bank plugs were extremely lean and the right bank plugs looked great! Im kinda confused! What could cause this?
Just for the heck of it I swapped O2 sensors. I havent had a chance to see if it made a difference. I dont believe an A9L reads side to side though. It really boggles me. I havent seen this issue before?
The A9L does read each side indepentantly. I would bank on the one on the lean side is bad. May as well change both, while you are in there, the "good one" is probably on borrowed time.
I do believe they are the stock O2's from 1986 with 75,000 on them now. Hopefully it'll be that easy of a fix. If it did change, I'll just change both to be on the safe side.