Fuel Injection System - Digital: Description

The Digital Fuel Injection (DFI) system is a speed density fuel system which accurately controls air/fuel mixture providing maximum engine performance and minimizes emissions.

The system consists of 11 major systems and sub-assemblies: Fuel Delivery, Air Induction, Data Sensors, Electronic Control Module (ECM), Electronic Spark Timing (EST), Idle Speed Control (ISC), Emission Controls, Closed Loop Fuel Control, System Diagnostics, Cruise Control and Torque Converter Clutch (TCC).

The ECM, an on-board computer, monitors engine operations and environmental conditions. The ECM controls amount of fuel metered through injector valves based upon engine demand and exhaust emissions. Fuel is supplied to engine through 2 electronically pulsed (timed) injector valves located in throttle body.

NOTE: Primary sub-systems which affect fuel system operation will be covered in this section: fuel delivery, air induction, Idle Speed Control (ISC), data sensors and Electronic Control Module (ECM). See DFI CONTROL SYSTEM article in COMPUTER CONTROLS section for more information.