A 1997 Toyota 4Runner uses individual ignition coils to control the spark to each individual spark plug. The problem is, that when it comes time to replace the spark plugs, you have to remove each coil as well as the spark plug itself. This looks more difficult than it actually is, and removing the coils then the plugs will take about 10 minutes per spark plug.
Pop the hood. Unbolt one of the ignition coils from the valve cover of the engine using the 3/8-inch ratchet and socket. Grip the ignition coil at the base and lift it up towards the hood while twisting your wrist at the same time.
Remove the spark plug from the engine using the 3/8-inch ratchet, extension and a spark plug socket. Then discard the old spark plug. Set the gap to .044 on the replacement spark plugs using the spark plug-gapping tool.
Install the spark plug into the engine using the 3/8-inch ratchet, extension and spark plug socket. Push the ignition coil onto the spark plug until it clicks in place. Then bolt the ignition coil to the valve cover using the 3/8-inch ratchet and socket.
Repeat steps 1 to 3 with the remaining spark plugs on the engine.
