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Ford Mustang GT 2005-2014: How to Replace Spark Plugs

The spark plugs work together with your fuel to spark up your engine and allow it to start. Learn how you can change your spark plugs in the Ford Mustang GT.

By Bassem Girgis - October 30, 2015
Contributors: AmericanMuscle.com

This article applies to the Ford Mustang GT (2005-2014).

The spark plugs in the Ford Mustang GT are located on the cylinder head on top of your engine. They work together with the fuel and air mixture to spark up your car, creating a small explosion that allows your car to start. When the spark plugs burn, they lose the ability to spark properly, which results in loss of power, slow start, and often times you car won't start at all. Replacing the spark plugs is one of the few procedures left for car owners to replace, because it is rather simple and straightforward. Be sure to purchase the proper spark plugs for your year and model. Read below to learn how to change the spark plugs yourself in the Mustang GT.

Figure 1. Spark plugs.

Materials Needed

  • 7mm socket
  • 9/16 deep socket with extension
  • PB Blaster
  • Anti-seize lube
  • New spark plugs

Step 1 – Disconnect battery

Remove the negative (black) battery terminal, then wrap it in a towel to prevent it from touching any metal and creating a spark.

Figure 2. Disconnect negative (black) battery terminal.

Step 2 – Remove coil packs

Each coil has an electrical connection on top of it, so to remove it, you will have to squeeze the tab and pull it out. Remove the coil packs by unbolting the 7mm bolt to the right of each coil pack. In the GT, there will be eight total. Pull the coil packs out gently.

  • Figure 3. Coil pack electrical harness and bolt.
  • Figure 4. Remove coil pack.

Step 3 – Remove spark plugs

Spray the spark plugs with PB Blaster, and then wait 15 minutes. This allows the spark plug to loosen up so it doesn't break when you're removing it.

Use your 9/16 deep socket and extension to remove the spark plugs located inside the engine block, which are under the coil packs you've removed.

Figure 5. Remove spark plugs.

Step 4 – Install new plugs

Rub the new spark plug tips with anti-seize lubricant. Be sure to check the gaps for the sparks. A lot of the new spark plugs come gapped and ready to install, but if they aren't gapped, gap them to 0.45". Tighten the spark plugs and torque them to 25 ft-lbs.

Install the coil packs the same way you removed them, then tighten the bolt on the right of each pack, and connect the electrical connection.

Re-connect your negative battery terminal and start the car.

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