Tools You'll Need:
* Spark plug socket: A deep-well, 5/8-inch spark plug socket is usually required. A universal joint and extension will be crucial for access to the rear plugs.
* Ratchet: A ratchet with a comfortable grip.
* Wrench: May be needed to loosen plug wire connectors.
* New spark plugs: Use the correct type and heat range specified for your engine. Check your owner's manual.
* Penetrating oil (optional but recommended): Helps loosen seized spark plugs.
* Gloves: Protect your hands.
* Shop rags or paper towels: To clean up.
* Torque wrench: Essential for tightening the spark plugs to the correct specification. Over-tightening is very damaging.
* A good light: The work area is cramped.
Procedure:
1. Safety First: Disconnect the negative (-) terminal from your battery. This prevents accidental shorts and electrical shocks.
2. Access: This is the most challenging part. You'll likely need to remove parts to get sufficient access to the rear spark plugs. This often involves:
* Removing the intake manifold: This is a major undertaking and requires extensive mechanical knowledge. Do not attempt this unless you have experience with engine repair. A repair manual will be essential if you have to do this. This step is often avoidable if you are very careful and use flexible extensions.
* Removing the air intake system: This will give you some more space to work. This is usually a simpler task involving unclipping various parts. Consult your repair manual for exact steps.
3. Locate the spark plugs: Once you have sufficient access, locate the three rear spark plugs.
4. Remove the spark plug wires: Carefully disconnect the spark plug wires from the spark plugs. Take note of which wire goes to which plug to avoid confusion during reinstallation. Some people use a camera to take pictures for reference.
5. Loosen the spark plugs: Spray penetrating oil onto the plugs if necessary, letting it sit for a few minutes. Use the spark plug socket and ratchet to carefully loosen the spark plugs. Avoid dropping the plugs into the engine cylinder!
6. Remove the spark plugs: Once loosened, carefully remove the old spark plugs by hand.
7. Clean the spark plug wells: Use compressed air to blow out any debris from the spark plug wells.
8. Install the new spark plugs: Install the new spark plugs by hand, screwing them in until they are snug. Do not over-tighten by hand.
9. Tighten the spark plugs with a torque wrench: This is crucial. Use a torque wrench to tighten the spark plugs to the manufacturer's specified torque. You'll find this specification in your repair manual. Over-tightening can strip the threads or crack the spark plug.
10. Reconnect the spark plug wires: Carefully reconnect the spark plug wires to the new spark plugs, ensuring a secure connection.
11. Reassemble: Reassemble any components you removed to gain access (air intake, etc.)
12. Reconnect the battery: Reconnect the negative (-) battery terminal.
13. Start the engine: Start the engine and check for any misfires or other problems.
Important Considerations:
* Repair Manual: This is absolutely critical. A repair manual specific to your 2000 Buick LeSabre will provide detailed diagrams and instructions, making the job much easier and safer.
* Experience: If you lack experience with car repair, it's best to seek professional help. This job is significantly more difficult than replacing the front spark plugs. Incorrectly replacing the spark plugs can cause serious engine damage.
This is a general guideline. Always refer to your vehicle's repair manual for specific instructions and torque specifications. If you are uncomfortable performing this repair yourself, it is best to take your vehicle to a qualified mechanic.
