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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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