Fuel Injector

The correct amount of fuel can not be delivered to the engine cylinders without the supply of air from the air intake system. The Powertrain Control Module (PCM), along with the information sensors and switches, controls the activity between all three systems. The following are the main components of the vehicles fuel supply system:

• The fuel rail assembly.
• The fuel pressure regulator.
• The fuel pump.
• The fuel tank.
• The fuel filter.
• The fuel supply pipes and hoses.

This vehicle is equipped with a returnless, on-demand, fuel system that reduces evaporative emissions. The fuel pressure regulator is housed inside of the fuel tank and is part of the fuel sender assembly. Locating the fuel pressure regulator in the fuel tank eliminates the need for a return line from the fuel rail. The on-demand system prevents the internal temperature of the fuel tank from rising and thereby reduces evaporative emissions. This vehicle is equipped with a Sequential Fuel Injection (SFI) system. The function of the fuel metering system is to deliver the correct amount of fuel to the engine under all operating conditions. The main component of the vehicle's fuel metering system is the fuel injectors. There is one fuel injector for each cylinder. The fuel injectors are controlled sequentially by the PCM. The PCM bases the control of the fuel injectors on several important engine parameters. These engine parameters include the following:

• The Mass Air Flow (MAF) sensor.
• The Intake Air Temperature (IAT) sensor.
• The Engine Coolant Temperature (ECT) sensor.
• The Throttle Position (TP) sensor.
• The engine speed (RPM).
• The Heated Oxygen Sensor (HO2S).

The air intake system provides measured clean air to each cylinder for proper mixture with the pressurized fuel. The following are the main components of the vehicle's air intake system:

• The throttle body assembly.
• The Air Cleaner (ACL) assembly.
• The air filter element.
• The air inlet supply ducts.
• The intake manifold and plenum.

The engine is designed to use only unleaded fuel. Unleaded fuel must be used for proper emission control system operation. Using unleaded fuel will also decrease spark plug fouling and extend engine oil life. Leaded fuel can damage the emission control system. The use of leaded fuel can result in the loss of emission warranty coverage.