If you know how to change Audi A4 spark plugs yourself, you can save a lot of money not paying expensive mechanic repair fees. Spark plugs are part of the ignition system and are the basis of an internal combustion engine. Mechanics recommend you change your spark plugs every 15,000 miles. Changing spark plugs on your Audi A4 can be very simple if you know how to do it. Follow the advice in this article to change Audi A4 spark plugs.
To change the spark plugs in your Audi A4, you will need:
- Socket wrench set
- Spark plug socket
- Socket wrench extension
- New spark plugs
- Spark plug gap tool
- Audi A4 repair manual
- Torque wrench
- Open the hood of your Audi A4. Find each of the four spark plug locations. Follow the spark plug wires from the coil pack if you are having trouble finding them.
Remove the plug wire starting with the far left spark plug. The Audi A4 has a four cylinder engine, which means it will have all four spark plugs located at the top of the engine in plain site. Note that it is best to only remove one plug wire at a time so you do not get the spark plug wire order confused, causing the engine to misfire.
- Insert a spark plug socket into the plug hole and remove the plug using a socket wrench. You can use a special spark plug socket that is specially designed not to damage the ceramic coating of the spark plug during removal and installation. Use a socket wrench extension if necessary.
Remove the plug and check for any oil or corrosion. These are signs that you have an improper mixture inside of the cylinder head. Discard the old plug.
- Prepare the new spark plug by checking your repair manual and adjusting the spark plug gap using a special plug gap tool. Spread spark plug grease along the ceramic insulator. Insert the new plug and use the spark plug socket and a torque wrench to tighten it to repair manual specifications. Do not over-tighten or you will damage the ceramic coating.
- Repeat this process on each of the four plugs until you have replaced them all. Start the engine and ensure that there are no trouble codes that start flashing. Look under the hood and ensure there are no open sparks caused by a damaged plug or plug wire.
Set the gap on the new spark plugs all at once to save time.