my Skoda Octavia NL (2020-Present) has a rough idle, what could be wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal for safety.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coils by unscrewing the bolts and disconnecting the electrical connectors.
• Carefully remove the old spark plugs using a spark plug socket.
• Inspect the spark plugs for wear; replace if necessary with OEM parts.
• Install the new spark plugs, tightening them to the manufacturer’s specified torque (typically around 20-25 Nm).
• Reattach the ignition coils.

3. Clean or Replace Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, screwdriver set.
• Remove the air intake duct to access the throttle body.
• Clean the throttle body using throttle body cleaner and a soft cloth, ensuring not to damage the sensors.
• If the throttle body is damaged, replace it with a new one.

4. Inspect and Repair Vacuum Hoses

• Tools Required: Pliers, hose clamps.
• Visually inspect all vacuum hoses for cracks, wear, or disconnections.
• Replace any damaged hoses and ensure all connections are secure.

5. Check Fuel System

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the 'ON' position and check that the fuel pressure is within the manufacturer’s specified range.
• If fuel pressure is low, check the fuel pump and fuel filter for issues and replace as necessary.