Section 03-04B: Fuel Charging and Controls, 5.0L and 5.8L Engines | 1996 Vehicles Equipped with 5.0L and 5.8L SFI V-8 Engines Workshop Manual |
The eight fuel injectors (9F593) are electromechanical devices which both meter and atomize fuel delivered to the engine (6007). The multiport fuel injectors are mounted in the lower intake manifold (9424) and are positioned to direct fuel just ahead of the engine intake valves (6507). The fuel injector consists of a solenoid and valve assembly. An electrical control signal from the powertrain control module (PCM) (12A650) activates the injector solenoid, causing the needle to move inward off the seat, allowing fuel to flow. Since the injector flow orifice is fixed and the fuel pressure drop across the fuel injector is constant, fuel flow to the engine is regulated by how long the solenoid is energized. Atomization is obtained by a director metering plate at the point where the fuel separates.
All vehicles equipped with 5.0L and 5.8L SFI engines have deposit-resistant injectors (DRI) installed. This fuel injector is designed to eliminate the lean fuel delivery concerns which occur with conventional multiport fuel injectors when low grade, nondetergent fuels are used.