what causes my Toyota Camry XV40 (2007-2011) to stall when idling?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface with the engine off.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Clean the Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, socket set
• Remove the air intake duct leading to the throttle body.
• Spray throttle body cleaner onto a soft cloth and wipe the inside of the throttle body to remove carbon buildup.
• Open the throttle plate manually to clean both sides thoroughly.

3. Inspect and Replace the Idle Air Control (IAC) Valve

• Tools Required: Socket set, torque wrench, new IAC valve (if needed)
• Locate the IAC valve, typically mounted on or near the throttle body.
• Disconnect the electrical connector and remove the mounting screws.
• Compare the old IAC valve with the new unit for proper fit.
• Install the new IAC valve and tighten the screws to the manufacturer’s torque specifications.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition key to the "On" position (do not start the engine) and check the pressure reading.
• If the pressure is low, inspect the fuel pump and fuel filter for issues.

5. Inspect Vacuum Hoses

• Tools Required: Visual inspection, possible replacement hoses
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses with new ones to ensure proper vacuum levels.