Here's a general outline of the procedure. Specific steps may vary slightly depending on your engine (4.3L, 5.7L, etc.) and the exact location of the module. Always consult a repair manual specific to your year and engine for detailed instructions and diagrams:
1. Safety First:
* Disconnect the negative battery cable. This is crucial to prevent accidental shorts and injury.
* Allow the engine to cool completely. If you've been driving, the engine and components will be hot.
2. Locate the Ignition Module:
* The ignition module's location varies slightly depending on the engine. It's often mounted on the distributor, near the firewall, or on the intake manifold. Consult your repair manual for the precise location. It's usually a small, rectangular box with wiring connected to it.
3. Disconnect Wiring:
* Carefully disconnect all wiring harnesses and connectors from the ignition module. Take pictures or make notes of the connections to ensure correct reassembly. Some connectors may be difficult to access, requiring the use of tools.
4. Remove the Ignition Module:
* The module may be held in place by screws, bolts, or clips. Use the appropriate tools to remove these fasteners. Again, consult your repair manual for specifics. Be gentle to avoid damaging the module or its mounting location.
5. Install the New Ignition Module:
* Carefully install the new ignition module, ensuring it's correctly seated and aligned.
* Securely reattach any screws, bolts, or clips.
6. Reconnect Wiring:
* Carefully reconnect all wiring harnesses and connectors to the new ignition module, matching your notes or pictures. Double-check that everything is properly seated.
7. Reconnect the Battery:
* Reconnect the negative battery cable.
8. Test the Ignition System:
* Try to start the engine. If it doesn't start, double-check all connections and ensure the new module is compatible with your vehicle. You may need to test other components in the ignition system (distributor cap, rotor, coil, etc.) if the problem persists.
Important Considerations:
* Repair Manual: This is essential. A Haynes or Chilton manual for your specific year and model Blazer will provide detailed diagrams and instructions.
* Parts: Ensure you're using a replacement ignition module that's specifically designed for your 1993 Chevrolet Blazer and engine type. Using the wrong part can cause further damage.
* Tools: You'll likely need basic hand tools such as screwdrivers, sockets, and possibly a ratchet.
* Professional Help: If you're uncomfortable with any step, don't hesitate to seek professional assistance from a qualified mechanic.
This is a general guideline. Always consult your repair manual for specific instructions and diagrams relevant to your vehicle. Failing to do so could lead to incorrect installation and potential damage. Remember safety first!
