Brief Summary
This video provides a step-by-step guide on replacing spark plugs in a 2009-2016 Audi A4 with a 2.0L turbo TFSI engine. The process includes removing the engine cover, disconnecting the wire loom and coils, extracting the old spark plugs, and installing new NGK spark plugs. Key points include using the correct tools, ensuring proper torque, and checking for oil leaks in the cylinder tubes.
- Removing and reinstalling the engine cover and wire loom.
- Safely disconnecting the coils and extracting the spark plugs.
- Installing and torquing new NGK spark plugs to the specified value.
Removing the Engine Cover and Wire Loom
To begin, remove the top engine cover by lifting it at the corners and setting it aside. Next, disconnect the wire loom attached to the coils by removing the T30 Torx bolt located in the center. The presenter uses a Milwaukee M12 ratchet to efficiently remove this fastener.
Disconnecting the Coils
Unplug the coils by pushing the connector in towards the coil, squeezing the tab, and pulling the connector off. Start at cylinder number one and work towards cylinder number four, leaving the injectors plugged in. Slide the harness back to access the coils.
Removing the Coils
Use a pry bar or flat blade screwdriver to gently pry up the coils, being careful not to damage anything. Find a good pivot point and lightly pry up. Once slightly raised, the coils can be removed by hand. As you lift the coils, continue to pull the harness back to free them completely.
Inspecting the Cylinder Tubes
After removing the coils, inspect the cylinder tubes for oil leaks from the valve cover. If oil is present, the valve cover seals and gaskets may need replacement. If the tubes are clean, proceed to remove the spark plugs.
Removing the Spark Plugs
Use a 5/8 socket with a 10-inch extension and a standard ratchet to break the spark plugs free by hand. Then, switch to a Milwaukee M12 ratchet to slowly extract the spark plugs, avoiding damage to the threads. The presenter recommends this ratchet as a time-saving tool.
Installing the New Spark Plugs
Install new NGK spark plugs, which come pre-gapped from the factory. Check the gap and return the plugs if it's significantly off, as these plugs are not designed to be manually gapped. Carefully feed the new spark plugs into the tube using the 5/8 socket, start the threads by hand, and then use the Milwaukee M12 ratchet to slowly spin them in until they bottom out.
Torquing the Spark Plugs
Set a torque wrench to 22 ft-lbs and torque the spark plugs, starting at cylinder number one and working towards cylinder number four. Apply even pressure and slowly rotate the wrench until it clicks, avoiding jerking motions to ensure accurate torque.
Reinstalling the Coils and Connectors
Drop the coils back into the cylinder head and align the connectors. Start with coil number four and work towards the front for easier installation. Push the connectors together until they click, ensuring they are fully seated. Double-check for any gaps in the connectors and adjust as needed.
Final Steps and Reassembly
Reinstall the T30 Torx bolt to secure the wire loom. Finally, reinstall the top engine cover by lining it up and pushing it down until it locks into place. This completes the spark plug replacement on the Audi A4.
