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Old 10 Jul 2013, 03:20 am
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Default What does pgm-fi mean?

I look under the hood of my 89 honda crx to find a label saying (duel point pgm-fi 16 valve) what does this all mean? Is this fuel injection if so what type of fuel injection what does 16 valves do?
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Old 10 Jul 2013, 03:37 am
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16 valves refers to the number in the head of the engine - there are 4 valves per cylinder and 4 cylinders in the engine. Of those 2 are intake and 2 are exhaust per cylinder. The PGM-FI is indeed a reference to fuel injection - Programmed Fuel Injection to be exact. This is a summary from Honda's website" In technical terms, PGM-FI is an n-alpha mapped injection system. That means the basic variables are the engine speed (n) and the throttle angle (alpha). 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. 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. This process of recalculation of fuel delivery specs is repeated many times per second to ensure the correct mixture is being delivered to meet the existing conditions, and to provide optimal performance and remarkably crisp throttle response over a wide range of operating conditions."































Honda Website - you can read the
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