In 1992, Honda redesigned the Civic, eliminating the square body style in favor of a more modern and rounded body style. The 1993 Civic came with two engine sizes, a 1.5-liter and a 1.6-liter. The 1.5-liter engine produced 70 to 102 horsepower, depending on the model selected, and the 1.6-liter produced 125 horsepower. As a part of basic maintenance, Honda recommended replacing the spark plugs in the 1.5- and 1.6-liter engines every 30,000 miles.
Check the gap of all four new spark plugs, using a spark plug gap tool. The 1.5- and 1.6-liter engines require a gap from 0.039 to 0.043 inches. Adjust the gap, using the spark plug gap tool, as needed.
Grab the rubber boot on the engine side of the spark plug wire and pull upward with a twisting motion to remove the wire. Inspect the wire for any defects, such as cracking, splitting, visible aging or brittleness. Replace all of the spark plug wires if defects exist on any of the wires. Make certain to only remove and replace one wire at a time to retain the correct firing order.
Remove the spark plug with a ratchet, spark plug socket and a 6-inch extension. Pull the spark plug from the socket and insert a new plug into the socket until the rubber insert in the socket holds it in place. Hand-tighten the spark plug into the engine, using the 6-inch extension and spark plug socket.
Torque the spark plug to 13 foot-pounds, using a torque wench, spark plug socket and a 6-inch extension.
Apply a thin coat of dielectric grease into the inside of the spark plug boot and set the spark plug boot wire onto the spark plug. Press down on the spark plug wire boot until you feel it "click" onto the spark plug.
Repeat Steps 2 through 5 to replace all four spark plugs and wires, if needed.
