Throttle Chamber Assembly: Notes

The throttle chamber assembly of the SPFI system contains an injector, throttle sensor, air control valve and pressure regulator that are combined in a single body. This throttle chamber assembly is a single-bore, down-draft type equipped with an injector in the intake passage of throttle valve. It consists of fuel system, by-pass air control system, and throttle sensor system.

Fuel is fed from fuel inlet pipe and injected from injector. Fuel also flows around injector to cool it. The pressure regulator regulates fuel pressure and returns unused fuel to fuel tank through fuel return line. The injector is operated by a signal from SPFI control unit, based on engine speed and load.