Not certain why you may intend by saying the O2 sensor is bypassed? The sensor is still in the manifold and still sending a mv signal to the computer. If the mixture is lean the voltage drops and if rich the voltage rises. The computer will increase injector pulse width to spray more fuel when the O2 sensor is reading lean. That is, if unusually lean for example due to >10% ethanol. Fuel flow will increase up to either the limit of the computer software, injector size, fuel pump/line/filter capacity.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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