Fuel Injection System - BOSCH AFC: Description: Notes

The Bosch Air Flow Controlled (AFC) fuel injection system is an electronically-controlled system, operated by incoming air flow. The AFC fuel injection system also contains a feedback system which measures oxygen content of exhaust gases. It uses this information to maintain the air/fuel ratio at approximately 14.7:1.

The fuel injection system consists of an electric fuel pump, fuel pressure regulator, fuel injectors, Electronic Control Unit (ECU), air flow meter, air temperature sensor, throttle switch, coolant temperature switch, oxygen sensor, catalytic converter and electrical relays.

In addition, all models except 944 are equipped with a cold start system to aid in cold engine starts. The cold start system consists of an auxiliary air valve, cold start injector and thermo time switch.

944 models are equipped with electronic engine control. On these vehicles the ECU controls ignition timing in addition to fuel injection.