Replacing the spark plugs is one of the simplest vehicle maintenance procedures that can be performed by most vehicle owners. Correctly-operating spark plugs will ensure the timing and ignition systems are running properly. The spark plugs should be checked every 30,000 miles or 24 months. After purchasing the replacement spark plugs, have the store clerk check the gap in each spark before leaving the store. The correct gap for a 2000 Toyota Corolla is 0.043 inches.
Open the hood of the car. Remove the engine cover from the top of the engine. The cover has retaining bolts on each side that can be removed with a socket wrench.
Disconnect the electrical connections to each individual ignition coil over the spark plugs. Pry outward on the tab with a small standard screwdriver located on the electrical connector to release the connection from the coil. Remove the mounting bolt with a socket wrench holding each ignition coil over the spark plug. Label each ignition coil as you remove them or work on removing and installing one ignition coil and spark plug at a time.
Remove each spark plug with a socket wrench and spark plug socket.
Apply anti-seize compound to each spark plug, coating the threads with a thin coat.
Install the spark plugs in the cylinder head. Finger-tighten the bolts before tightening them with a torque wrench and spark plug socket. Tighten the spark plugs to 156 inch-pounds.
Cover each plug with the corresponding ignition coil. Tighten each mounting bolt with a socket wrench. Connect the electrical connections to each ignition coil by hand.
Place the engine cover over the top of the engine block and install the retaining bolts with a socket wrench.
