my Skoda Octavia NFL (2020-Present) has a rough idle after starting, why?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

1. Remove the engine cover if applicable.
2. Use a socket wrench to remove the spark plug wires or coils.
3. Extract the spark plugs using a spark plug socket.
4. Inspect the spark plugs for wear, carbon buildup, or damage. If worn, replace with manufacturer-specified plugs.
5. Torque the new spark plugs to the manufacturer's specifications (usually around 15-20 Nm).
6. Reconnect the spark plug wires or coils.

3. Clean or Replace the Idle Air Control Valve (IAC)

1. Locate the IAC valve (usually near the throttle body).
2. Disconnect the electrical connector and remove the mounting screws.
3. Clean the valve with an appropriate electronic cleaner or replace it if damaged.
4. Reinstall the IAC valve and reconnect the electrical connector.

4. Inspect and Repair Fuel System

1. Connect a fuel pressure gauge to the fuel rail.
2. Turn the ignition to the "ON" position (without starting) to check fuel pressure.
3. If pressure is below specifications, inspect the fuel filter and replace if clogged.
4. Inspect fuel injectors for proper operation and clean if necessary.

5. Air Intake Inspection

1. Check for any loose or damaged hoses in the air intake system.
2. Inspect the air filter and replace if dirty.
3. Ensure the throttle body is clean and free of carbon deposits.