PCM is a misnomer for an outboard. It is the computer that runs the motor, determines duty-cycle on the injectors (which adjusts the mixture effectively), controls spark, monitors various engine sensors, etc. In a car, it stands for “Powertrain Control Module”. There it also controls when the A/C compressor is on or off based on horsepower demand, controls transmission shift points, etc. It is not a “cheap” part either. 2008 Pantera Classic2014 Mercury Pro XS 200
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