How to replace the distributor cap on a 1968 Ford Mustang GT Fastback (Bullitt)?

When owning a classic vehicle like the 1968 Ford Mustang GT Fastback (Bullitt), regular maintenance is essential to keep it running smoothly. One common issue you may encounter is a worn-out distributor cap, which can lead to misfires, rough idling, or problems starting the engine. If your car is exhibiting these symptoms, it might be time to replace the distributor cap. Here is how to solve this issue.

Step 1: Locate the Distributor Cap

• Open the car's hood and secure it with the hood prop rod.
• The distributor cap is located at the rear of the engine bay, near the firewall.
• It is a circular, plastic cap that sits atop the distributor, with multiple spark plug wires attached to it.

Step 2: Take Note of Spark Plug Wire Positions

• Before removing the distributor cap, it's crucial to note the position of each spark plug wire.
• You can label each wire with a piece of masking tape and a marker to ensure you can reconnect them correctly.
• Alternatively, take a clear photo of the current setup for reference.

Step 3: Remove the Spark Plug Wires

• Carefully remove the spark plug wires from the distributor cap.
• Twist the boot of each wire slightly while pulling to avoid damaging the wires.
• Leave the other end of the wires connected to the spark plugs so they don’t get mixed up.

Step 4: Detach the Distributor Cap

• Locate the retaining clips or screws that hold the distributor cap in place. In a 1968 Ford Mustang, these are typically metal clips or screws on the sides of the cap.
• Use a screwdriver to gently undo the clips or screws. Be cautious not to lose them.
• Lift the distributor cap off the distributor.

Step 5: Install the New Distributor Cap

• Position the new distributor cap over the distributor. Ensure it sits properly in the same orientation as the old one.
• Secure the cap using the same clips or screws you previously removed.

Step 6: Reconnect the Spark Plug Wires

• Use the notes or photo you took earlier to reconnect each spark plug wire to the corresponding terminal on the new distributor cap.
• Press each wire firmly onto the terminal until it clicks in place.

Step 7: Check Your Work

• Ensure all wires are securely connected and in their original positions.
• Double-check that the distributor cap is seated correctly and secured tightly.

Step 8: Test the Engine

• Close the hood and start the engine.
• Listen for a smooth idle and check for any signs of misfiring or rough running.
• If the engine runs smoothly, your replacement has been successful.

By following these steps, you can replace the distributor cap on your 1968 Ford Mustang GT Fastback (Bullitt) and restore optimal performance. Regular checks and maintenance can prolong the life of your classic car and keep it roadworthy for years to come.