how to troubleshoot the engine misfire in my Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, fuel pressure gauge, multimeter, replacement spark plugs, ignition coils (if necessary).
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Replace Spark Plugs

• Sub-steps:
  1. Disconnect the negative battery terminal.
  2. Remove the ignition coil cover if applicable.
  3. Disconnect the ignition coils from the spark plugs.
  4. Using a spark plug socket, carefully remove the old spark plugs.
  5. Inspect the old spark plugs for wear and match to specifications for replacement.
  6. Install new spark plugs by hand to avoid cross-threading, then torque to the manufacturer's specifications (usually around 20 Nm).
  7. Reconnect the ignition coils and cover.

3. Replace Ignition Coils (if necessary)

• Sub-steps:
  1. If diagnostics indicate faulty ignition coils, remove the old coils after spark plug replacement.
  2. Disconnect the electrical connectors from the ignition coils.
  3. Remove the mounting bolts securing the ignition coils to the engine.
  4. Install new ignition coils by reversing the removal steps, ensuring they are seated properly.
  5. Reconnect the electrical connectors.

4. Check Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) to allow the fuel pump to prime.
  3. Check fuel pressure against manufacturer specifications (typically between 50-70 psi).
  4. If pressure is low, check the fuel pump, filter, and fuel lines for blockages or failures.