How to Replace Spark Plugs in a Mitsubishi Eclipse

The spark plugs in a Mitsubishi Eclipse allow the engine to run efficiently and use less gas. The Mitsubishi Eclipse engine uses four different types of spark plugs: standard, iridium, iridium evolution and platinum. The standard type requires replacement at 30,000 miles. The iridium type requires replacement at 105,000 miles. Replace iridium evolution and platinum spark plugs after 60,000 miles.

Instructions

1

Cool the engine before attempting to remove any spark plugs.

2

Remove the spark plug wires located across the top of the Eclipse model's engine. The spark plug wires connected to the spark plugs are the flat circular ends. Grab the wire around the circle and twist to unlock the wire. Lift up on the wire to remove it from the engine. Some models with ignition coils above the spark plug may require you to unhook the wire from the ignition coil to remove the wire.

3

Drop the socket with the extension and socket wrench attached into the cylinder well and on top of the spark plug. Turn the socket wrench to unscrew and pull the spark plug out of the engine.

4

Spray silicone spray into the cylinder well and onto the new spark plug threads.

5

Insert the new spark plug into the socket with the threads sticking out. Slide the socket into the cylinder well and gently turn the wrench to the right to thread the spark plug into the cylinder head.

6

Use the tension tool to test the tension or torque of the new spark plug. Set the tension to the specifications listed on the spark plug package.

7

Reattach the spark plug wire to the new spark plug.

8

Continue this process with the other spark plugs. Be sure to only complete one spark plug replacement at a time.