Skoda Octavia NFL (2020-Present) rough idle when stopped, what could cause this?

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 to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the ignition coils to access the spark plugs.
  2. Use a spark plug socket to unscrew and remove the old spark plugs.
  3. Inspect the old spark plugs for wear or fouling.
  4. Install new spark plugs, ensuring the correct gap is set (consult manufacturer specifications).
  5. Reinstall the ignition coils.

3. Clean or Replace Throttle Body

• Sub-steps:
  1. Remove the intake duct to access the throttle body.
  2. Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding areas.
  3. If damaged, replace the throttle body with a new unit, ensuring proper alignment.
  4. Reattach the intake duct securely.

4. Inspect Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn on the ignition (do not start the engine) to check fuel pressure; compare it against manufacturer specifications.
  3. If pressure is low, inspect the fuel pump and fuel filter for issues.
  4. Replace the fuel filter if it is clogged or due for maintenance.

5. Check Engine Mounts

• Sub-steps:
  1. Visually inspect engine mounts for any visible cracks or signs of wear.
  2. Use a pry bar to test for excessive movement in the mounts.
  3. If mounts are worn or damaged, replace them with new mounts.

Tools Required:

• OBD-II scanner
• Spark plug socket
• Throttle body cleaner
• Fuel pressure gauge
• Basic hand tools (wrenches, sockets, screwdrivers)

Parts Required:

• Spark plugs
• Ignition coils (if necessary)
• Throttle body gasket (if replacing throttle body)
• Fuel filter (if necessary)
• Engine mounts (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical systems.
• Allow the engine to cool before inspecting engine components.