Depending on the way the system is programmed, the state of the sensor has different effects. On some systems, like GM and early Chryslers, the oxygen sensors were used as more of a feedback device. In those cases, you are quite correct. BUT, on the more modern OBD2 systems, depending on the oxygen sensor as a feedback device is simply too slow and too late to meet modern emission requirements. Oxygen sensors are strictly "after the fact" sensors. By the time the system has reacted to a rich or lean condition, too many more cycles have taken place. On the contemporary systems, mass air flow meters have replaced the old MAP and VAF sensors. They are much more accurate in determining air/fuel needs, and they can respond and correct fuel mixtures much faster than relying on an after combustion sensor. Faster and more powerful PCMs along with more and better sensors all over an engine leave the oxygen sensor in a secondary role of giving the rest of the system a "report card" so to speak.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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