Fuel Injection System - TBI: Description

The throttle body fuel injection system consists of 7 major sub-assemblies: fuel supply system, throttle body assembly, Idle Air Control (IAC) System, Electronic Control Module (ECM), Electronic Spark Timing (EST), data sensors, and emission controls. Fuel is supplied to the engine through electronically pulsed injector(s) located in the throttle body assembly on top of intake manifold. The ECM controls the amount of fuel metered through the injector(s) based upon engine demand.