Here's a step-by-step guide:
1. Locate the Distributor: The distributor is usually located on the passenger side of the engine compartment, near the firewall. It's a cylindrical component with several wires and a cap on top.
2. Disconnect the Wires: Carefully disconnect the spark plug wires from the distributor cap. It's crucial to note the order of the wires. They are numbered or positioned in a specific firing order. Take a picture or diagram the order before removing them to ensure correct reassembly. Some people use a marker to number the wires and the cap itself.
3. Remove the Rotor: The rotor is the rotating part inside the distributor cap. It usually has a clip or screw holding it in place. Remove it carefully.
4. Remove the Distributor Cap: The cap typically clips onto the distributor body. You might need to gently wiggle it or use a small flat-head screwdriver to pry it loose. Be gentle to avoid breaking the cap.
5. Inspect the Components: Examine the old distributor cap and rotor for any signs of wear, cracks, carbon tracking, or corrosion. Replace both if necessary, as a worn rotor can cause misfires even with a new cap.
6. Install the New Cap: Carefully align the new distributor cap with the distributor body. Make sure it snaps securely into place.
7. Install the Rotor: Insert the new rotor (if replaced) aligning it with the distributor shaft. Secure it in place using the clip or screw.
8. Reconnect the Wires: Reconnect the spark plug wires to the new distributor cap in the same order they were removed. Double-check your notes or picture to ensure accuracy.
9. Reconnect the Battery: Reconnect the negative battery terminal.
10. Start the Engine: Start the engine and check for proper operation. Listen for any misfires or unusual noises.
Important Considerations:
* Safety First: Always disconnect the negative battery terminal before working on any part of the ignition system.
* Firing Order: The firing order for the 4.3L V6 is crucial. Getting this wrong can lead to engine damage. If you are unsure, consult your vehicle's repair manual.
* Repair Manual: A repair manual specific to your 1996 Chevy Astro van is highly recommended. It will provide detailed diagrams and instructions, ensuring you complete the job correctly.
* Professional Help: If you're uncomfortable performing this repair yourself, take your vehicle to a qualified mechanic.
This guide provides general instructions. Specific details might vary slightly depending on your exact Astro van model and engine configuration. Always consult a repair manual for the most accurate and detailed instructions.
