Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.