Fuel Charging and Controls

The fuel charging and controls system consists of the:

• throttle body (TB).
• fuel charging wiring.
• fuel rail.
• fuel injector.
• fuel pump relay.

The fuel charging and controls system is:

• a sequential multiport fuel injection (SFI) system.
• pulse-width modulated.
• mass air flow controlled. The fuel rail:
• delivers fuel to the individual fuel injectors.
• receives fuel from the fuel supply tube.

The TB:

• controls air supply to the upper intake manifold by positioning the throttle plate.
• connects the accelerator cable and, if equipped, speed control actuator cable to the throttle plate.
• is not adjustable.
• cannot be cleaned. The fuel injectors:
• are electrically operated by the powertrain control module (PCM).
• have an internal solenoid which opens a needle valve to inject fuel into the lower intake manifold.
• atomize the fuel as the fuel is delivered.
• are deposit-resistant.