my Skoda Octavia NFL (2020-Present) has a rough idle after changing the spark plugs, what’s going on...

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before proceeding.

2. Inspect and Reseat Spark Plugs

• Sub-steps:
  • Remove the ignition coils if applicable to access the spark plugs.
  • Carefully remove each spark plug with a spark plug socket and ratchet.
  • Inspect each spark plug for signs of damage, wear, or incorrect gap settings.
  • Re-gap the spark plugs to the manufacturer's specifications if needed.
  • Reinstall the spark plugs, ensuring they are tightened to the specified torque (typically around 15-20 Nm).

3. Check Ignition Coils

• Sub-steps:
  • Inspect each ignition coil for cracks or signs of wear.
  • Ensure the electrical connectors are clean and securely attached.
  • If necessary, replace any faulty ignition coils.

4. Inspect Air Intake and Vacuum Lines

• Sub-steps:
  • Visually inspect all vacuum lines and air intake hoses for damage or disconnections.
  • Reconnect or replace any damaged components.
  • Clean the throttle body if excessive carbon buildup is present.

5. Verify Fuel System

• Sub-steps:
  • Use a fuel pressure gauge to check the fuel pressure at the rail.
  • Compare the reading against manufacturer specifications.
  • Replace the fuel filter if it is clogged and affecting fuel delivery.