why does my Volkswagen Golf Seventh Generation (2013-2020) engine misfire at idle

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and securely supported.

2. Inspect and Replace Spark Plugs

• Remove the ignition coils by unscrewing the retaining bolts and gently pulling them out.
• Use a spark plug socket to remove the old spark plugs from the engine.
• Inspect the condition of the spark plugs for signs of wear or fouling.
• Install new spark plugs (use OEM or equivalent specifications) and torque to manufacturer specifications (typically around 15 lb-ft).
• Reinstall the ignition coils.

3. Check and Replace Ignition Coils (if necessary)

• If any ignition coils are found to be faulty during inspection, replace them with new coils.
• Ensure they are seated properly and reconnect the electrical connectors securely.

4. Fuel System Check

• Connect a fuel pressure gauge to the fuel rail and turn on the ignition to check fuel pressure.
• If pressure is low, inspect the fuel filter and replace it if clogged.
• Use a fuel injector cleaner or replace injectors if they are found to be dirty or faulty.

5. Inspect Air Intake and Throttle Body

• Remove the air intake duct and inspect for vacuum leaks.
• Clean the throttle body and idle air control valve using throttle body cleaner to remove carbon deposits.
• Reassemble the air intake system ensuring all connections are secure.