My left v-band at the turbo has a slight leak and throws the reading off at idle. Through 1st and 2nd gear I'm getting wheel spin and tracrion contol is pulling timing. That throws the a/f off side to side. Through 3rd gear the a/f is very close to the same. That is what my data log shows. Here is top of 3rd.That is 1 of the best in car vids I've seen period.
Why is their such a difference between the 2 AFR sensors though?