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Maybe in the middle of acceleration because that's when your current O2 sensor finally heats up enough to start responding. These wide band o2 need to be around 1500* or something like, iirc, which it's not going to get to except under heavy load or with the internal heaters working.
Had to put a heated o2 sensor on my Miata to get it to stop running rich - o2 was too far downstream on the header to stay warm - and that wasn't even a wide-band. If I drove it spiritedly, in the summer at least, it would warm up enough too.
PS: I found even cheap wide-band o2's on Aliexpress, so if the one goes on my insight, I know where I'll try first.
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