CAMS, INTAKE, and HEADS can affect this level. This in turn affects transmission line pressure and, in extreme cases, can have an effect on shift timing. This is then compared to set parameters in the PCM program as a determining factor for everything from fuel to air ratio to estimated engine torque output. This current is what the PCM reads to determine how much air is entering the engine. When warm resistance is increased, current is decreased. It is cooled and when a conductor is cooled, resistance decreases and current can increase. A current is passed through it as air travels across this wire. In some cases with large cams an issue with the MAF may cause quick shifts from 1-2-3-4 at WOT and require adjustment of the MAF tables in the tune.īasically a MAF sensor is a piece of resistant wire. Though this does not greatly affect shift timing, it does affect shift firmness and can cause erratic shift if faulty or incorrect. Determines shift firmness and greatly affects kick-down and part throttle up-shifts.Ĭ. I list these together because there is interdependence between them.ī. They are listed below in descending order:Ī. It is dependent on many things to determine shift timing. In the 4L60E the up-shifts are completely controlled by the PCM. You may be able to hold gears down by using the shifter, but you cannot cause the up-shifts to occur before the PCM commands it. On the 4L60E, however, it is strictly a PCM programming function. It is somewhat adjustable with the TV cable setting. In the 700R4, this is a function of governor pressure versus TV pressure.
99 4L60E SHIFT KIT INSTALL
While we do install a shift kit to improve shifts and reduce slip, this has no affect on when the transmission shifts.
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