In a closed-loop EFI system, the ECU fine-tunes the air-fuel based on feedback from the oxygen or lambda sensor.
This sensor measures the amount of oxygen in the exhaust gas and sends a signal to the ECU to adjust the fuel injection accordingly. The goal is to maintain a precise air-fuel ratio for optimal engine performance and reduced emissions.In a closed-loop EFI (Electronic Fuel Injection) system, the ECU (Engine Control Unit) fine-tunes the air-fuel mixture based on feedback from the oxygen sensor, which measures the level of oxygen in the exhaust gases.