How to Change the Spark Plugs on a 1997 Nissan Maxima

Unhook the ground cable from the negative battery post by loosening the retaining bolt with a socket then pulling the clamp off the post.

Check the gap on the new spark plugs using a feeler gauge. It should measure 0.043 inch. Adjust if necessary.

Remove the four screws that secure the coil cover to the cylinder head using a Phillips head screwdriver. Then pull the coil cover off the head.

Disconnect the electrical connector from the first coil (located near the oil drain fill plug) by pulling it off by hand.

Remove the two screws that secure the coil to the head using a Phillips head screwdriver. Lift the coil away from the head.

Remove the old spark plug from the head using a spark plug socket and extension. Remove the spark plug from the Maxima.

Apply a thin coat of anti-seize compound to the threads on the new spark plug.

Install the new spark plug into the head using a spark plug socket and extension.

Insert the coil onto the new spark plug. Reinstall the two screws that secure it using a Phillips head screwdriver.

Press the electrical connector onto the coil by hand.

Repeat this process to replace the other spark plugs on the engine.

Set the coil cover in place over the cylinder. Reinstall the four screws that secure the cover to the cylinder head.

Slide the ground cable onto the negative battery post. Tighten the retaining bolt with a socket.

Run the engine to test the spark plugs.