Fuel Delivery and Air Induction: Description and Operation

System Layout:

This vehicle is equipped with a 1.6 liter, 4 cylinder, SOHC (single overhead camshaft) gasoline engine, and a computer controlled electronic fuel injection system (referred to as EGI - electronic gasoline injection). The system maintains an air/fuel mixture as close as possible to the ideal stoichiometric ratio, for all operating conditions. Fuel is supplied to the injectors at high pressure by an electric fuel pump in the tank. The computer monitors various sensors mounted on the engine, including an exhaust gas oxygen sensor, then uses this information to determine the amount of fuel needed. The computer energizes the injectors (either all at once or in pairs) for varying lengths of time, depending on the amount of fuel required.


The primary fuel and intake components are covered in this section. For information regarding electronically controlled devices, the computer, and its functions, refer to COMPUTERIZED ENGINE CONTROLS.

The fuel and intake system consists of the following:

Accelerator pedal and cable
Air cleaner, intake air ducts and associated parts
Air valve
Fuel tank
Fuel pump
Fuel pump relay
Fuel filter
Fuel pressure regulator
Fuel rail
Fuel hoses
Fuel injectors
Idle speed control (ISC) valve
Resonance chamber
Resonance duct
Throttle body