my Skoda Octavia NFL (2020-Present) has a bad vibration at idle

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, vacuum gauge, fuel injector cleaner.
• Allow the engine to cool before starting any work.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Engine Mounts

• Sub-steps:
  1. Raise the vehicle securely using jack stands.
  2. Locate the engine mounts (typically found on both sides of the engine).
  3. Using a socket set, remove the bolts securing the engine mounts to the engine and the chassis.
  4. Carefully lift the engine slightly with a jack to relieve pressure on the mounts.
  5. Remove the damaged mounts and replace them with new mounts.
  6. Reinstall bolts and torque them to the manufacturer's specifications (typically around 40-60 Nm).
  7. Lower the engine and recheck the mount alignment.

3. Clean or Replace Idle Air Control Valve

• Sub-steps:
  1. Locate the IAC valve (usually near the throttle body).
  2. Disconnect the electrical connector and remove any mounting screws.
  3. If cleaning, use throttle body cleaner to remove carbon build-up; if faulty, replace with a new valve.
  4. Reinstall the IAC valve and reconnect the electrical connector.

4. Inspect Ignition System

• Sub-steps:
  1. Remove spark plug wires or coils from the spark plugs.
  2. Inspect spark plugs for wear; replace if worn or fouled.
  3. Test ignition coils using a multimeter for proper resistance values.
  4. Replace any faulty coils or spark plugs.

5. Check for Vacuum Leaks

• Sub-steps:
  1. Use a vacuum gauge to check the engine vacuum at idle (should be consistent).
  2. Inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses and retest vacuum levels.

6. Clean Fuel Injectors

• Sub-steps:
  1. Remove fuel injector connectors and clean using a fuel injector cleaner.
  2. If performance issues persist, consider removing injectors for ultrasonic cleaning or replacement.
  3. Reinstall cleaned or new injectors and ensure all connections are secure.