I put LT's on the car and the passenger primary 02 sensor is about half way in(it's stripped) when I tried to put the sensor in. Well went to the track and my mph was alteast 2 mph lower than what it was with shorties. My friend had a autotap and plugged it in. It read "primary 02 sensor bank(1 or 2) can't remember and 02 sensor secondary banks 1 and 2. Now I know that the rears will always say that cause I don't have any cats. But I think my passenger side primary is bad or going bad.

Would this sensor cause the EEC to retard the timing and make it run rich? I made sure that the car was in close loop before racing. When I spoke to another guys there he said that once he put LT on his car it made it run rich. So I figured what the hec and I'll lean it out a bit. Well I did pick the mph. I haven't been on the dyno yet but I'm gonna try to fix this first. Any advise would be appreciated. Thanks. -Mark