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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