Programmed fuel injection
Programmed Fuel Injection, or PGMFI/PGM-FI, is an electronic fuel injection system initially developed by Honda more than 20 years ago. This system has been applied to Honda motorcycles, Formula 1 and racing cars, as well as automobiles.
Since the advent of EFI, or electronic fuel injection, Honda has used this method to their full advantage. Honda offered some of the first low priced vehicles in North America to employ programmed fuel injection. Originally developed for racing cars, PGM-FI made its way into Honda automobiles in the late 1980’s in their Accord and Prelude models which featured the Honda A20A, A20A3 & A20A4 engines (Honda A engine). The 1986 Honda Civics were the first Civics to feature PGM-FI. In 1998, Honda built the first motorcycle with PGM-FI, the VFR800FI. Honda had this system copyrighted from 1987-1997.
PGM-FI works by injecting the right amount of fuel per cylinder based on specific engine data. The engine's control computer has sensors which measure the temperatures of the engine, coolant, oil, and outside air as well as pressure sensors to monitor oil and barometric pressure. Based on these readings and the location of the throttle, the Engine Control Unit (ECU) calculates how much oxygen and fuel should be mixed for optimal and efficient performance.
Cars with PGM-FI do not have to sit and warm the engine up in the winter season because the ECU calculates at what RPM and the fuel and air mixture the car requires to be at a normal engine temperature range.