why does my Skoda Octavia's engine stall when idling

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, fuel pressure gauge, cleaning supplies.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Clean or Replace the Idle Air Control Valve

• Sub-steps:
  1. Disconnect the battery to prevent electrical shorts.
  2. Remove the air intake duct to access the IAC valve.
  3. Unplug the electrical connector from the IAC valve.
  4. Remove the IAC valve using the appropriate socket size.
  5. Clean the IAC valve using throttle body cleaner and a soft brush.
  6. If the valve is damaged, replace it with a new one.
  7. Reinstall the IAC valve and reconnect the electrical connector.

3. Address Vacuum Leaks

• Sub-steps:
  1. Inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or spray soapy water to check for leaks.
  3. Replace any damaged hoses or seals.
  4. Recheck the intake manifold and gaskets for leaks.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure reading.
  3. Compare the reading against manufacturer specifications (typically between 35-50 PSI).
  4. If pressure is low, check the fuel pump and replace if necessary.

5. Inspect Ignition System

• Sub-steps:
  1. Remove the spark plugs and inspect for wear or carbon buildup.
  2. Replace worn spark plugs with new ones, ensuring the correct gap.
  3. Test ignition coils with a multimeter to ensure they are within specification.
  4. Replace any faulty ignition coils.