My friend that tuned me was watching 02 readings and showed right where the readings start saying it's running lean. But no, I don't have a wideband which I understand does make it harder to prove it's leaning out but to my understanding a wideband is not the only way to see if it's leaning out? I am not a tuner so I can't tell you exactly what he looked at to see where/when it is leaning out. But from how I understood it, right at 18ms pulse width knock started creeping up and the 02 was reading lean from how it was explained to me.
