1994 Mustang

Section 03-04B: Fuel Charging and Controls—5.0L

1994 Mustang Workshop Manual

DESCRIPTION AND OPERATION

Fuel Injectors

The fuel injectors (9F593) are:

Electro-mechanical devices which both meter and atomize fuel delivered to the engine.
Mounted in the lower intake manifold (9424) and positioned such that their tips are directing fuel just before the engine intake valve (6507) .

The fuel injector valve body consists of a solenoid actuated valve assembly. An electrical signal from the powertrain control module (PCM) (12A650) activates the fuel injector solenoid, causing the needle to move inward off the seat, allowing the fuel to flow. Since the fuel injector flow orifice is fixed and the fuel pressure drop across the injector tip is constant:

Fuel flow to the engine is regulated by how long the solenoid is energized.
Atomization of the fuel is obtained by contouring the needle at the point where the fuel separates.

Item	Part Number	Description
1	—	Rail O-Ring Seal (Part of 9F593)
2	—	Integral Filter (Part of 9F593)
3	—	Coil (Part of 9F593)
4	—	Armature (Part of 9F593)
5	—	Manifold O-Ring Seal (Part of 9F593)
6	—	Stainless Steel Valve Body (Part of 9F593)
7	—	End Cap (Part of 9F593)
8	—	Stainless Steel Needle (Part of 9F593)
9	—	Washer (Part of 9F593)
10	—	Electrical Connector (Part of 9F593)