Here's a general overview. Specific steps might vary slightly depending on the exact trim level of your Cavalier:
Tools You'll Likely Need:
* New Ignition Lock Cylinder: Ensure you get the correct one for your 1991 Cavalier. You'll likely need your VIN to be certain.
* Security Bit Set: The steering column usually requires specialized bits (often Torx security bits).
* Screwdrivers: Various sizes and types, including Phillips and possibly flathead.
* Pliers: Needle-nose pliers can be helpful.
* Socket Set: Possibly needed depending on how the steering column is attached.
* Wiring Diagram: A wiring diagram for your Cavalier's ignition system is strongly recommended. This will help you reconnect the wires correctly.
* Pen and Paper: To record the position of wires before disconnecting them.
* Ignition Switch Removal Tool (Optional but Recommended): This tool makes the process much easier.
General Steps (These are guidelines, and your specific Cavalier may differ):
1. Disconnect the Battery: This is crucial to prevent electrical shorts and injury. Disconnect both negative and positive terminals.
2. Remove the Steering Wheel: This is often the most difficult part. You'll likely need to remove the steering wheel cover (if present), then use the appropriate security bit to remove the nut securing the steering wheel to the steering column. Mark the steering wheel's position relative to the steering column before removal to ensure proper realignment.
3. Access the Ignition Lock Cylinder: This usually involves removing the steering column shroud or trim. This process often involves removing screws and possibly some plastic clips. Refer to a repair manual for specific instructions.
4. Disconnect Wiring Harness: Carefully disconnect the wiring harness from the ignition lock cylinder. Take pictures or make detailed notes of the wire positions before disconnecting them. This is essential for reconnecting everything correctly.
5. Remove the Ignition Lock Cylinder: There's usually a retaining clip or screw holding the cylinder in place. This is where an ignition switch removal tool can be extremely helpful. The process often involves using a small tool to carefully manipulate the cylinder out of the steering column.
6. Install the New Ignition Lock Cylinder: Carefully install the new ignition lock cylinder, ensuring it's properly seated and aligned.
7. Reconnect the Wiring Harness: Reconnect the wiring harness according to your notes or pictures.
8. Reassemble Everything: Reinstall the steering column shroud, steering wheel, and any other parts you removed. Remember to properly tighten all fasteners.
9. Reconnect the Battery: Reconnect the battery terminals.
10. Test the Ignition System: Test the ignition system thoroughly to ensure everything works correctly.
Important Considerations:
* Repair Manual: A repair manual specific to your 1991 Chevrolet Cavalier is highly recommended. It will provide detailed diagrams and instructions tailored to your vehicle.
* Security: The ignition lock cylinder is a critical security component. Ensure you purchase a replacement from a reputable source to avoid issues with the quality and security of the new cylinder.
* Professional Help: If you're unsure about any step of this process, it's best to seek professional assistance from a qualified mechanic or locksmith. This is a complex repair, and mistakes can be costly.
This information is for general guidance only. Always consult a repair manual specific to your vehicle's year, make, and model before attempting any repairs. Improper repair can lead to damage and safety hazards.
