Here's a general procedure. You'll need to consult a repair manual specific to your Blazer's engine (e.g., 4.3L V6, 5.7L V8) for precise location and wiring diagrams. These diagrams are crucial to avoid mistakes.
Steps:
1. Locate the Ignition Module: This is usually mounted on the distributor cap, or on the firewall near the distributor, sometimes attached to the engine block. Your repair manual will show the exact location.
2. Disconnect the Wiring Harness: Carefully unplug the electrical connector(s) from the ignition module. Take a picture or make a note of which wire goes where before disconnecting to aid in reassembly. Some connectors may have locking tabs; gently release them.
3. Disconnect the Ground Wire (if applicable): Some modules have a separate ground wire. Disconnect this wire.
4. Remove the Ignition Module: This usually involves unscrewing one or two bolts holding it in place. The module may be held in by a clip or retainer. Be gentle to avoid damaging the module or its mounting point.
5. Install the New Ignition Module: Carefully align the new module with its mounting points and secure it with the bolts or clips.
6. Reconnect the Wiring Harness: Plug the electrical connector(s) firmly back onto the new module, ensuring a secure connection. Refer to your notes or picture to ensure correct placement.
7. Reconnect the Ground Wire (if applicable).
8. Reconnect the Battery Cable: Carefully reconnect the negative battery terminal.
9. Test the Ignition System: Start the engine and check for proper operation. Listen for consistent engine running and check for any misfires or rough idling. If problems persist, double-check all connections.
Important Considerations:
* Repair Manual: A repair manual specific to your 1993 Chevy Blazer is essential. It will provide detailed diagrams and instructions for your particular engine.
* Safety: Always disconnect the negative battery cable before working on the ignition system to prevent electrical shocks and damage.
* Part Selection: Make sure you purchase the correct ignition module for your specific engine. The part number should match the one on your old module.
* Wiring Diagram: Use a wiring diagram to be absolutely sure you are connecting everything correctly. Improper wiring can damage the module or other components.
If you're uncomfortable performing this repair yourself, it's best to take your Blazer to a qualified mechanic. Incorrect installation could lead to further damage to your vehicle.
