how to diagnose and fix a misfire in my Volkswagen Golf MK7.5 (2020-Present)?

Solution

1. Preparation

• Gather tools and materials required for the repair.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plugs

• Remove the engine cover if applicable.
• Use a socket wrench to remove the spark plug boots from the ignition coils.
• Remove the ignition coils by unscrewing them from the cylinder head.
• Using a spark plug socket, carefully remove the old spark plugs.
• Inspect the condition of the old plugs and replace them with new ones (ensure correct gap).
• Reinstall the ignition coils and secure them with bolts.
• Reattach the spark plug boots.

3. Replace Ignition Coils (if necessary)

• If the ignition coils show signs of damage, remove them as described above.
• Install new ignition coils, ensuring they are seated correctly.
• Secure them with bolts and reconnect the wiring harness.

4. Inspect and Clean Fuel Injectors

• If the injectors are suspected to be faulty, remove them from the fuel rail.
• Using a fuel injector cleaning kit, clean the injectors according to the manufacturer’s instructions.
• Reinstall cleaned or new injectors, ensuring proper seating and connection.

5. Check Vacuum Lines

• Visually inspect all vacuum hoses connected to the intake manifold.
• Replace any damaged or cracked hoses.
• Ensure all connections are secure and leak-free.