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I've not been able to confirm that O2 sensor position is a factor. As I posted earlier, I swapped my stock exhaust manifold for another Civic setup, which the O2 is at the back of the manifold near the firewall. Even with that setup I could still engage lean burn. My problem is the O2 sensor. Shortly after making my earlier posts my factory sensor went bad, and I bought a cheap replacement. After buying the replacement I can no longer engage lean burn without the engine hesitating and stumbling when it tries to engage.
I've bought another manifold that moves the O2 sensor back up next to the exhaust ports, but have yet to install it. If that solves my problem then I will report back. If not, it's my cheap O2 sensor that cannot handle the lean burn.
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