Tools You'll Need:
* Socket wrench set (likely a 7/16" or 1/2" socket, check your car)
* Ratchet
* Extension(s) (might be needed depending on access)
* New coil pack (ensure it's the correct one for your engine)
* Gloves (optional, but recommended)
* Possibly a wire brush to clean the terminals
Procedure:
1. Safety First: Disconnect the negative terminal from your car battery. This prevents accidental shorts and shocks.
2. Locate the Coil Pack: The coil pack is usually located on top of the engine, near the distributor (if your car has one). It's a rectangular box with multiple wires connected to it. The location varies slightly depending on the engine; consult a repair manual for the exact location.
3. Disconnect the Wires: Carefully disconnect the spark plug wires from the coil pack. Note which wire goes to which spark plug – take a picture or make a diagram. Misplacing them will cause misfiring or no start. You'll likely need to gently pull or tug on the wires to disconnect them from the coil pack terminals.
4. Remove the Coil Pack Bolts: Use the appropriate socket to remove the bolts holding the coil pack in place. There are usually two or more bolts.
5. Remove the Coil Pack: Once the bolts are removed, carefully lift off the coil pack. It might be slightly snug, but shouldn't require excessive force.
6. Clean the Terminals: Use a wire brush to clean any corrosion or dirt from the coil pack terminals and the spark plug wire terminals. This helps ensure good electrical connection.
7. Install the New Coil Pack: Carefully align the new coil pack and install it in the same position as the old one. Secure it with the bolts you removed earlier, tightening them to the specified torque (check your repair manual).
8. Reconnect the Wires: Reconnect the spark plug wires to the new coil pack, making sure each wire is connected to the correct terminal, matching your diagram or picture.
9. Reconnect the Battery: Reconnect the negative battery terminal.
10. Test: Start your car and check for any misfires or other issues. If the problem persists, double-check all connections.
Important Considerations:
* Repair Manual: A Haynes or Chilton repair manual for your specific 1990 Chevy Cavalier is invaluable. It will have detailed diagrams and instructions specific to your engine.
* Engine Type: The procedure might vary slightly depending on whether you have a 1.8L or a 2.0L engine.
* Distributor (If Applicable): If your engine uses a distributor, the coil pack might be integrated into it. Replacing the distributor might be necessary in this case.
* Professional Help: If you're uncomfortable performing this repair yourself, take your car to a qualified mechanic.
This guide provides a general overview. Always prioritize safety and consult your repair manual for specific instructions and torque values to avoid damage to your vehicle.
