my Volkswagen Golf MK7 (2015-2019) has a misfire, what could be causing it?

Solution

1. Preparation

• Gather all tools and parts required for the repair.
• Disconnect the negative terminal of the battery to ensure safety while working on electrical components.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coils by unscrewing the bolts and gently pulling them out.
• Using a spark plug socket, remove the old spark plugs. Inspect threads for damage.
• Install new spark plugs, taking care to torque them to the manufacturer’s specifications (usually around 22 ft-lbs).
• Reinstall the ignition coils, ensuring they seat properly.

3. Inspect and Replace Ignition Coils (if necessary)

• Tools Required: Socket set, torque wrench.
• If the ignition coils were found to be faulty, remove them as outlined in the previous step.
• Install new ignition coils, ensuring they are properly seated and tightened to the manufacturer’s specifications.

4. Check and Replace Fuel Injectors (if necessary)

• Tools Required: Fuel pressure gauge, basic hand tools.
• Disconnect the fuel lines and electrical connectors from the injectors.
• Remove the fuel rail and injectors, inspecting for clogs.
• Replace any faulty injectors with new units.
• Reinstall the fuel rail and reconnect all lines and connectors.

5. Final Inspection

• Reconnect the negative terminal of the battery.
• Clear any error codes from the OBD-II scanner.