How do you change sparkplugs on 04 chevy montecarlo?

Answer 1

1. Turn the ignition switch to the OFF position, then disconnect the negative battery cable.

2. On the 3.8L (VIN K) engine, the cosmetic/acoustic engine cover, also called the fuel injector sight shield, must be removed. Remove this cover by first turning the tube/oil fill cap counter-clockwise from the valve rocker arm cover. Lift the fuel injector sight shield up at the front and slide the tab out of the engine bracket.

3. Remove only one spark plug wire at a time to avoid mixing up the wires. Each must be returned to its original location. Note the position of the spark plug wires before removing them. The high energy in these ignition systems can cause induced voltages to fire in adjacent spark plug wires. For this reason, the factory engineers take care to position the wires to minimize "crossfire." Wires should be returned to their exact locations and secured with whatever clips or loom components were originally installed.

4. Spark plug boots tend to stick firmly to the spark plug insulator. DO NOT pull on the spark plug wire. Pull on the spark plug boot or heat shield only, twisting a half-turn to release the seal while removing. Do not pull on the spark plug wire or it may be damaged.

5. Using the proper size spark plug socket, remove the plug from the cylinder head.

To install:

1. Verify that the spark plug is clean, properly gapped and that the threads are lightly lubricated with clean engine oil.

2. Be sure the plug threads smoothly into the cylinder head and is fully seated. Use a "thread chaser" if necessary to clean the threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread damage. Follow the recommended torque specifications carefully. Some technicians will place a small piece of rubber tubing (like a piece of vacuum line) on the end of the spark plug and use it to turn the plug, by hand. In this way, if the plug is not threaded properly, not enough torque can be placed on the plug to do any damage.

3. Torque the spark plug to 11-15 ft. lbs. (15-20 Nm).

4. Install the spark wire to the spark plug, making sure the connector engages the spark plug and the boot is fully seated.

5. On the 3.8L (VIN K) engine, install the cosmetic/acoustic cover. Insert the tab of the fuel injector sight shield under the engine bracket. Place the hole of the shield onto the oil fill neck of the valve rocker arm cover. Install the tube/oil fill cap onto the valve rocker arm cover and twist clockwise in order to lock.