Ford Mustang V6 2005-2014: How to Replace Spark Plugs and Wires

This article applies to the Ford Mustang V6 (2005-2014).

Standard copper plugs can last anywhere from 10,000 to 20,000 miles. A more expensive iridium or platinum plug can last 60,000 miles or more, with a few boasting a lifespan of over 120,000 miles. The bottom line is, they won't last forever, and if you start to notice symptoms like trouble starting or rough idles, it may be time to change out your plugs. While you're at it, changing the wires wouldn't be a bad idea either. While not a job for the faint at heart, the process is straightforward and can be done for a lot less than you would pay a mechanic. This article will show you how to change the spark plugs and wires on your Ford Mustang V6.

Step 1 – Disconnect the battery

Like any job involving the vehicle's electrical system, removing the power is the first step. Disconnect the ground cable as shown in Figure 1.

Step 2 – Disconnect the ignition wire

To do this job most efficiently, it's best to replace both the ignition wires and plugs one at a time. First, trace the ignition wire from the distributor cap to the spark plug boot, paying close attention to the routing and any clips that may hold the wire in place. Undo the clips shown in Figure 2, and then unplug the end boot first followed by the one at the plug. You might want to use a spark plug boot removal tool to reduce the chances of breaking the plug tip.

Step 3 – Remove the spark plug

For best results, use a 5/8" socket with an extension on a swivel to remove the plug. You can buy special spark plug sockets designed specifically for this task; where they hold the plugs in place for easy removal and installation. Apply some extra torque to get the plug started about 1/8 or 1/4 of a turn, and then spray some PB Blaster in the hole around the plug and let it soak. This is some insurance against it breaking off while you remove it, which would then require a special tool to extract the remainder of the broken plug. This one added step can save you a lot of time and money.

To finish removing the plug, it's always a good idea to do it by hand so you can tell if there is any cross threading before any damage is done.

Step 4 – Replace the plug

Depending on your replacement plugs, you may need to set the gap prior to installation. It is highly recommended to use anti-seize lubricant on the threads and the base of the new plugs to make them easier to remove the next time around.

Place the plug in the socket with the extension and start the threading by hand to get a good feel for how it is threading. If there is any resistance at all, remove it and start over. Once it is all the way in, tighten with a ratchet.

Step 5 – Replace the ignition wire

Replace the old ignition wire with the new one of the same length, and thread it through the same path as the old one, snapping in any connectors that you removed earlier. Use some dielectric lubricant on the inside of the spark plug boot to ensure a good connection and easy removal later.

Press down on both ends to make sure they snap in place and are completely secure, as shown in Figure 6.

Step 6 – Lather, rinse and repeat

Do the same process for the remaining five spark plugs and wires, and then fire up the engine to check your work.

Featured Videos: Mustang Spark Plugs and Wires

• V6 Spark Plug Change

• How to Install Spark Plug Wires

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