1. Safety First: Disconnect the negative battery cable. This prevents accidental shorts and injury.
2. Prepare the Workspace: Work on a level surface. You'll need basic tools including a socket set (including deep sockets), ratchet, extensions, spark plug socket (with rubber insert to avoid damaging the plugs), and possibly a wrench for the coil packs. A torque wrench is highly recommended.
3. Remove the Upper Intake Manifold: This is the most significant hurdle. This usually involves:
* Disconnecting various vacuum lines and hoses. Label them carefully or take photos as you go to ensure proper reassembly.
* Removing the throttle body. Be mindful of the throttle position sensor and other connections.
* Removing the fuel rail. You'll need to relieve fuel pressure; consult your repair manual for the proper procedure. This is crucial for safety and to prevent fuel leaks.
* Removing the upper intake manifold bolts. These are usually numerous and can be in awkward locations.
4. Access the Spark Plug Boots and Coils: Once the upper intake manifold is removed, you should have clear access to the coil packs (one per cylinder) which are likely mounted directly over the spark plugs.
5. Remove the Coil Packs: Carefully disconnect the electrical connectors from the coil packs and remove them. There are usually bolts or retaining clips securing the coil packs to the cylinder head.
6. Remove the Spark Plugs: Using the appropriate spark plug socket, carefully remove each spark plug. Avoid dropping anything into the cylinders.
7. Install New Spark Plugs: Install the new spark plugs to the proper torque specification (consult your repair manual). Don't over-tighten.
8. Reassembly: Reassemble everything in the reverse order of disassembly. Double-check all connections and vacuum lines. Reconnect the battery.
9. Verify Operation: Start the engine and listen for any unusual sounds or issues.
Important Considerations:
* Repair Manual: A factory service manual specific to your 1997 Oldsmobile Aurora 4.0L V8 is absolutely essential. It will provide detailed diagrams, torque specifications, and step-by-step instructions. This is not a job to attempt without one.
* Fuel System Pressure: Be extremely careful when dealing with the fuel system. Improper handling can lead to fire or injury. Consult your repair manual on how to safely relieve fuel pressure.
* Coil Packs: These can be fragile, so handle them carefully.
* Cleanliness: Keep the work area clean to avoid dropping anything into the engine.
This is a complex job. If you're not comfortable with automotive repair, it's strongly recommended to take your vehicle to a qualified mechanic. Attempting this without proper knowledge and tools can lead to damage to your engine.
