my Skoda Octavia NFL (2020-Present) engine stalls at stoplights, what's causing this?

Solution

1. Preparation

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

2. Inspect and Clean the Idle Air Control Valve

• Tools Required: Socket set, cleaner (throttle body cleaner), soft cloth.
• Remove the IAC valve from the throttle body by unscrewing the retaining bolts.
• Clean the valve and its housing with throttle body cleaner and a soft cloth.
• Reinstall the IAC valve and torque the bolts to the manufacturer's specifications (usually around 10-15 Nm).

3. Test and Replace the Throttle Position Sensor

• Tools Required: Multimeter, socket set.
• Detach the electrical connector from the TPS.
• Use a multimeter to check the voltage output while manually moving the throttle plate from closed to wide-open position.
• If the output is inconsistent or outside manufacturer specifications (typically 0.5 to 4.5 volts), replace the TPS.
• Reinstall the new TPS and reconnect the electrical connector.

4. Check for Vacuum Leaks

• Tools Required: Smoke machine (or brake cleaner), inspection mirror.
• Use a smoke machine to introduce smoke into the intake system and observe for leaks.
• Alternatively, spray brake cleaner around intake hoses while the engine is running and listen for RPM changes.
• Repair or replace any damaged hoses or gaskets found.