Electronic Fuel Injection: Description

The Chrysler Electronic Fuel Injection System is used on the 5.2L (318") engine in Imperial models only. The system includes several main sub-systems.- air induction, fuel delivery, fuel control, emission control, and computer control.

The air induction system includes a heated air system, an air flow meter, air cleaner, throttle body, throttle position potentiometer, throttle switch, and Automatic Idle Speed (AIS) motor.

The fuel delivery system provides fuel from the pump to (and from) the fuel control system. It is composed of an in-tank fuel pump, 2 fuel filters, check valve, pressure regulator, by-pass orifice, return line, and return check valve.

Fuel control does the actual delivery of fuel into the engine. This job is done using a variable flow pump mounted on a support plate under the air cleaner and above the throttle body. In addition to the pump, the system includes a fuel flowmeter and temperature sensor, fuel pressure switch, and fuel injector assembly. A power module provides the power to operate the control pump.

Emission controls are directly controlled by the fuel injection computer, but are not unique to the injection engine. These controls include EGR, air injection management and switching, evaporative emission control, and crankcase ventilation.

A computer controls the fuel injection system and regulates the air/fuel ratio. In addition, the computer controls ignition and emission systems. Various engine sensors are used to provide input to the computer. Two other modules assist the computer in controlling the fuel injection system: the Automatic Shut-Down Module and the Power Module.