In 1979, Ford began incorporating a distributor ignition system in the Mustang. This system relies on the Mustang ignition coil to trigger the spark plugs. Newer models use a distributorless ignition system, some of which use an ignition coil pack rather than ignition coils.
Determine the type of ignition system on your Mustang. In 1989, Ford began to use both a distributor and distributorless ignition systems. In these later years, the 4.6L and 5.4L engines continue to use ignition coils rather than a coil pack.
Detach the ground cable for the battery to ensure safety. Also, disconnect the wires connecting to the ignition coil. If you have a condenser connector equipped, you need to disconnect it, too.
Use a socket set or a wrench to unfasten the bolts on the coil. On models later than 1989, you may need to gently twist the ignition coil to break the seal.
Replace the old Ford Mustang ignition coil with the new one. Verify the types of engines and the year the ignition coil fits. With a history as long as the Mustang's, you don't want to buy the wrong part.
Reverse the steps to reassemble the ignition system. Start the Ford Mustang to test that the repair was successful.
