1. Identify the Fasteners:
* Look closely: Carefully inspect the plastic cover. Most likely, it's held on with either:
* Push-type clips: These are usually small plastic clips that snap into holes in the engine bay. You'll likely need a small flathead screwdriver or trim tool to gently pry them loose. Be careful not to break them!
* Screws: Less common, but possible. Check for small screws around the perimeter of the cover. You'll need a suitable screwdriver.
* Combination: It might have a combination of clips and screws.
* Consult a repair manual: A Haynes or Chilton repair manual for your specific year and model Buick Century will be extremely helpful. It will show diagrams of the engine compartment and the cover's attachment points. This is the best resource to avoid damage.
2. Removal Process:
* Disconnect the battery's negative terminal: This is crucial for safety to prevent accidental shorts or shocks.
* Start at the edges: Begin by carefully prying or unscrewing the fasteners at one edge of the cover. Work your way around slowly and methodically. Use gentle, even pressure to avoid breaking the plastic clips.
* Take your time: Don't rush. Take pictures before you start to help you remember the order of things if necessary.
* Lift the cover: Once all fasteners are removed, gently lift the cover away from the engine. There might be some resistance, so work carefully.
3. Replacing the Spark Plug Wires:
* Identify the wires: Carefully note the order of the spark plug wires before disconnecting them. Take pictures or make a diagram. Misplacing them can cause serious engine damage. The firing order for the 3.3L V6 is important to get right.
* Disconnect and replace: Disconnect the old wires one by one and connect the new wires in the exact same order.
* Secure the wires: Make sure the new wires are securely connected to both the spark plugs and the distributor cap.
4. Reinstallation:
* Replace the cover: Carefully align the cover with its mounting points and reattach the fasteners.
* Reconnect the battery: Reconnect the negative terminal of the battery.
Important Considerations:
* Plastic clips are fragile: Be extremely gentle when removing and replacing the clips. If they break, replacements might be needed.
* Ground wires: Be aware of any ground wires attached to the engine cover. Disconnect and reconnect them carefully.
* Sharp edges: Be cautious of sharp edges on the engine and cover. Wear gloves if necessary.
If you're not comfortable working on your car, it's best to take it to a qualified mechanic. Incorrectly installing spark plug wires can damage your engine. A repair manual is your best friend for this type of job.
