Section 03-04A: Fuel Charging and Controls, 4.9L Engine | 1996 Vehicles Equipped with 4.9L SFI Engines Workshop Manual |
The Sequential Multiport Fuel Injection (SFI) system is classified as a multi-point, pulse time fuel injection system. Fuel is metered into each intake port in sequence with the engine firing order. The fuel is pulsed through six fuel injectors (9F593) mounted on a tuned intake manifold (9424). Fuel amount is determined by engine demand.
The SFI system can be subdivided into four distinct categories: