why does my Honda Civic turn off when I stop at a red light

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, screwdrivers, cleaning supplies, and safety gloves.
• Ensure the vehicle is parked on a flat surface with the engine off.

2. Clean the Idle Air Control Valve (IAC)

• Locate the IAC valve, typically mounted on or near the throttle body.
• Disconnect the electrical connector and remove the IAC valve using the appropriate socket.
• Clean the valve with throttle body cleaner and a soft brush to remove any carbon build-up.
• Reinstall the IAC valve and reconnect the electrical connector.

3. Clean the Throttle Body

• Remove the air intake duct connected to the throttle body.
• Use a throttle body cleaner and a clean cloth to wipe the inside of the throttle body.
• Ensure the throttle plate opens and closes freely without sticking.
• Reinstall the intake duct securely.

4. Check Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Start the engine and monitor the fuel pressure reading. Compare it to manufacturer specifications (usually between 30-50 psi).
• If pressure is low, inspect the fuel pump and fuel filter for issues.

5. Inspect Mass Airflow Sensor (MAF)

• Locate the MAF sensor, typically situated between the air filter and throttle body.
• Disconnect the electrical connector and remove the MAF sensor.
• Clean the sensor with MAF cleaner (do not use other cleaners) and let it dry.
• Reinstall the MAF sensor and reconnect the electrical connector.