Fuel Charging and Controls

The fuel charging controls consist of the following:

• fuel injection supply manifold
• electronic throttle body
• fuel injectors
• fuel pressure and temperature sensor
• fuel pulse damper

The fuel injection supply manifold:

• delivers fuel to the individual fuel injectors.
• receives fuel from the fuel supply line.

The electronic throttle body:

• controls air supply to the upper intake manifold by electronically positioning the throttle plate.
• is not adjustable.
• cannot be cleaned.
• is serviced as a complete assembly only.

The fuel injectors:

• are electrically operated by the powertrain control module (PCM).
• atomize the fuel as the fuel is delivered.
• are deposit-resistant.
• each have an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.

The fuel pressure and temperature sensor:

• measures the pressure and temperature of the fuel in the fuel supply manifold and sends these signals to the PCM.
• uses intake manifold vacuum as a pressure reference.

The fuel pulse damper:

• reduces fuel system noise caused by the pulsing of the fuel injectors.