Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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 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. A/C equipped vehicles use an A/C solenoid valve to provide additional air when compressor is activated.
Fuego Turbo models are equipped with electronic engine control. On these vehicles the ECU controls ignition timing in addition to fuel injection.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.