Port Fuel Injection (PFI)

PFI system is a computerized fuel, ignition and emission control system designed to maintain fuel economy and reduce vehicle emissions. Fuel is metered to intake system through a separate injector, mounted in intake manifold next to intake valve, for each cylinder. An Electronic Control Unit (ECU) monitors data from various sensors and controls such functions as fuel injector pulse width ("on" time), ignition timing and emission control devices.