Car running LEAN right after it was running fine for what reason?

[GTPpower]

He is using the MAF. This method works really well and is a lot faster than using the stock narrowband. The wideband is just slightly less accurate at lamba than the narrowband is.

[bandook]

He is using the MAF. This method works really well and is a lot faster than using the stock narrowband. ..

Works a lot faster, lol! I've probably scanned and adjusted maf 30 times now. I know what your saying though. It most definitely should be a quick process. Russ, the guy who made the write-up, said it takes him minutes. 2-3 sub 7000hz tunes, and a wot tune.

I'll unplug my o2 tonight and see what happens. I considered it because that was his preferred method, but I'm definitely in open loop, no trims. So not sure why it would matter. Then again, I am always suspicious of the hidden tables in the PCM. Might still be some weird corrections happening with o2?