my Skoda Octavia NFL (2020-Present) is idling rough when warm

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a flat surface and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil cover (if applicable) using a socket set.
• Disconnect the ignition coils by unplugging their connectors.
• Remove the spark plugs using a spark plug socket.
• Inspect the old spark plugs for wear and replace them with new ones if necessary, ensuring they are gapped correctly. (Torque to manufacturer specifications, typically around 15-20 Nm).
• Reinstall the ignition coils and cover.

3. Clean or Replace IAC/Throttle Body

• Locate the IAC valve or throttle body.
• Disconnect the electrical connector and any hoses attached.
• Remove the throttle body using a socket set (usually requires 10-15 Nm torque).
• Clean the throttle body and IAC valve using throttle body cleaner.
• If damaged, replace the IAC valve or throttle body with a new one.
• Reinstall and reconnect all components.

4. Inspect Fuel System

• Check fuel pressure using a fuel pressure gauge, ensuring it meets specifications (consult service manual).
• If low, inspect fuel filter and replace if clogged.
• Verify function of the fuel injectors; clean or replace if necessary.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses for cracks or disconnections.
• Use a smoke tester if available to check for leaks around gaskets.
• Replace any damaged hoses or gaskets to ensure proper sealing.