What should be calibrated by the manufacturer whenever fuel injectors are changed or airflow is modified?

What should be calibrated by the manufacturer whenever fuel injectors are changed or airflow is modified?

• A. Meter
• B. ECU
• C. O2 Sensor
• D. Fuel Pump

Answer: (A)

When you swap injectors or modify intake airflow, the amount of fuel that the engine needs changes to keep the air-fuel ratio correct. The part that controls how much fuel is delivered—the metering system—must be calibrated so the injectors deliver the right amount for the new flow characteristics and the new amount of air entering the engine. This calibration ensures the engine can reach and maintain the target air-fuel ratio across different speeds and loads. Without it, the engine could run too rich or too lean, even if the ECU and sensors are working correctly. The ECU uses the injector flow data and sensor inputs to meter fuel, while the O2 sensor provides feedback, but the critical adjustment after changing injectors or airflow is the metering calibration.

When you swap injectors or modify intake airflow, the amount of fuel that the engine needs changes to keep the air-fuel ratio correct. The part that controls how much fuel is delivered—the metering system—must be calibrated so the injectors deliver the right amount for the new flow characteristics and the new amount of air entering the engine. This calibration ensures the engine can reach and maintain the target air-fuel ratio across different speeds and loads. Without it, the engine could run too rich or too lean, even if the ECU and sensors are working correctly. The ECU uses the injector flow data and sensor inputs to meter fuel, while the O2 sensor provides feedback, but the critical adjustment after changing injectors or airflow is the metering calibration.