Feedback Carburetor Air/Fuel Control

The feedback carburetor air/fuel mixture is controlled by the ECU. The ECU monitors throttle position, engine speed, coolant temperature, intake air temperature and exhaust oxygen concentration. The ECU calculates fuel flow required to yield desired air/fuel ratios. Closed loop control is used to adjust fuel flow. Fuel flow is modified to account for special operating conditions such as hot or cold starts, acceleration and deceleration.