my Skoda Octavia's engine runs rough at idle, what could be the issue?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the work area is well-ventilated and safe.
• Disconnect the battery to prevent electrical issues.

2. Replace Spark Plugs

• Remove the engine cover if applicable using a socket set.
• Disconnect the ignition coils and remove them from the spark plugs.
• Use a spark plug socket to remove the old spark plugs.
• Inspect the threads for any damage; clean if necessary.
• Install new spark plugs to the manufacturer’s specified torque (typically 18-22 lb-ft).
• Reattach the ignition coils and engine cover.

3. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to detect leaks while the engine is running.
• Replace any damaged hoses or reattach loose connections.

4. Clean or Replace Air Filter

• Locate the air filter housing and open it using a screwdriver or socket set.
• Remove the air filter and check for dirt and debris.
• If dirty, replace with a new air filter; if clean, reassemble the housing.

5. Test and Replace Fuel Filter (if necessary)

• Relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.
• Disconnect the fuel lines from the filter using a line wrench.
• Replace the old filter with a new one, ensuring the flow direction is correct.
• Reconnect the fuel lines and reinstall the fuel pump relay.