Next, the engine makes adjustments as needed to this basic fuel delivery figure according to additional variables such as intake-port pressure, engine coolant temperature, intake-air temperature and atmospheric pressure. Based mainly on these two measurements, the system looks to its fuel mapping for the fuel delivery figure corresponding to the n and alpha of the moment. That means the basic variables are the engine speed (n) and the throttle angle (alpha). In technical terms, PGM-FI is an n-alpha mapped injection system. So, just how does the Honda PGM-FI system operate that is, how does the system determine how much fuel it should deliver at the appropriate moment? The key behind this system is the constant monitoring and assessment of engine, atmospheric and riding conditions, and the use of this data to control the quantity of fuel injected into the engine.
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