my Toyota Camry XV40 (2007-2011) is stalling at stoplights what could be wrong

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Clean or Replace the Idle Air Control Valve (IAC)

• Locate the IAC valve, typically mounted on or near the throttle body.
• Tools Required: Socket set, screwdrivers, cleaning solvent.
• Sub-steps:
  1. Remove the electrical connector from the IAC valve.
  2. Unscrew the mounting bolts and carefully take out the IAC valve.
  3. Inspect the valve for carbon build-up; clean with a suitable solvent if dirty.
  4. If cleaning does not resolve the issue, replace the IAC valve with a new one.
  5. Reinstall the IAC valve and reconnect the electrical connector.

3. Test the Throttle Position Sensor (TPS)

• Tools Required: Multimeter.
• Sub-steps:
  1. Disconnect the TPS connector.
  2. Set the multimeter to the voltage setting.
  3. Measure the voltage output while moving the throttle from closed to wide open. It should vary smoothly.
  4. If the readings are erratic or out of range, replace the TPS.

4. Check for Vacuum Leaks

• Tools Required: Smoke machine or soapy water.
• Sub-steps:
  1. Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to introduce smoke into the intake system; watch for any escaping smoke that indicates a leak.
  3. If leaks are found, replace the faulty hoses or components.