DIY, change the ignition coil on your Ford Explorer manufactured in the years 2001, 2002, 2003, 2004 or 2005. For this repair you will need a new ignition coil from your local auto parts shop and a 7 mm socket wrench, with an extension. The repair process is quite simple and it will not take you more than 15 minutes.
First of all, open the hood of your car and go above the engine to locate the ignition coil. It should look like the one in the picture below, the piece with the six spark plug wires above it.
You should unplug these wires one by one, but be careful because they are numbered (at least the factory wires are). Just make sure you reconnect them back in the same position. After you remove them, unplug the wiring harness behind the ignition coil, marked with the red arrow in the image above. At this point, you can work to unscrew the four 7 mm bolts, shown in the image below, that secure the coil.
You can now replace the old coil with the new one. To finish the repair process, just reverse the steps above. Install the new coil and secure it with the four bolts, plug back the harness and the spark plug wires and you are done. These are the steps you have to follow if you need to change the ignition coil on your Ford Explorer made between the years 2001 and 2005.