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yes, that is true, but at idle it is open loop, also at full throttle. I am thinging of making a ECU that controls mixture by spoofing the O2 sensor.... it has a pam of throttle opening, manifold pressure, rpm etc and stores what the engine normally does, then with the cyl deactivation on it generates the O2 signal that makes the correct mixture.
Another way to do it is to have 2 separate exhaust systems, with the O2 sensor in only one that is not going to be deactivated. they can join further down
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