Tools You'll Need:
* Socket wrench set (metric)
* Ratchet
* Extension(s)
* Spark plug socket (likely 5/8" or 13mm)
* Wire brush (optional, for cleaning terminals)
* New coil pack module
* Gloves (recommended)
Procedure:
1. Disconnect the Battery: This is crucial to prevent electrical shorts and injury. Disconnect the negative (-) terminal first, then the positive (+) terminal.
2. Locate the Coil Pack: The coil pack is usually located on top of the engine, near the distributor (if equipped) or directly over the spark plugs. It's a rectangular or square-ish module with several wires connected.
3. Disconnect the Wires: Carefully disconnect the spark plug wires from the coil pack. Note the order of each wire, as they need to be reconnected in the same order. Take pictures if it helps. You might use a wire brush to clean the terminals on both the coil pack and the spark plug wires.
4. Disconnect Electrical Connectors: There will be one or more electrical connectors plugged into the coil pack. Carefully unplug these connectors.
5. Remove the Coil Pack Mounting Bolts: The coil pack is usually held in place by a few bolts. Carefully remove these bolts using the appropriate socket and ratchet. Sometimes they can be a bit stubborn.
6. Remove the Coil Pack: Once the bolts are removed, gently lift the coil pack off the engine.
7. Install the New Coil Pack: Align the new coil pack and carefully reverse the removal process. Make sure it sits correctly and securely.
8. Reconnect Everything: Reconnect the electrical connectors, spark plug wires (in the correct order!), and the battery terminals. Double check that all connections are secure.
9. Test the Car: Start the engine and listen for any unusual sounds. Check if the engine is running smoothly and if there are any misfires. If the problem persists after replacing the coil pack, other issues might be at play (e.g., faulty spark plugs, wires, distributor).
Important Considerations:
* Grounding: Ensure there's a good ground connection to the coil pack mounting area to prevent issues.
* Spark Plug Condition: While you're working on this, visually inspect your spark plugs. If they look worn or damaged, replacing them is highly recommended.
* Distributor (if applicable): If your 1990 Cavalier Z24 has a distributor, ensure the rotor is properly aligned. A misaligned rotor can cause misfires even with a new coil pack.
* Repair Manual: A factory service manual or a reputable repair guide specifically for your 1990 Chevy Cavalier Z24 will provide detailed diagrams and instructions tailored to your vehicle. This is highly recommended.
This guide provides a general overview. Without knowing the exact engine and your mechanical aptitude, specific details might differ. Always prioritize safety and consult a professional mechanic if you're unsure about any step of this process.
