what could cause my Toyota Camry XV40 (2007-2011) to stall at red lights?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before beginning work.

2. Clean the Throttle Body

• Remove the air intake duct to access the throttle body.
• Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding areas.
• Reattach the air intake duct securely.

3. Inspect and Clean the Idle Air Control Valve

• Locate the IAC valve (usually near the throttle body).
• Disconnect the electrical connector and remove the IAC valve from its mounting.
• Clean the valve with an appropriate cleaner and inspect for wear or damage.
• Reinstall the IAC valve and reconnect the electrical connector.

4. Test and Clean the Mass Airflow Sensor

• Locate the MAF sensor in the air intake path.
• Disconnect the electrical connector and carefully remove the sensor.
• Use MAF cleaner to clean the sensor elements, avoiding physical contact.
• Reinstall the MAF sensor and reconnect the electrical connector.

5. Check for Vacuum Leaks

• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine or spray a small amount of carburetor cleaner around the intake manifold and vacuum hoses while the engine is running to detect leaks.
• Replace any damaged hoses and tighten connections as necessary.