Here's a general guide. Consult your vehicle's repair manual for the most accurate and detailed instructions specific to your engine and Blazer model.
1. Locate the ICM:
* The ICM is typically located on or near the distributor. For many 1995 S-10 Blazers with the 4.3L V6, it's mounted on the distributor itself, making it easy to identify and access. However, on some models it could be on the firewall near the distributor. Visually inspect the area around the distributor to locate a small, square or rectangular electronic module. It might have wires connected and a heat sink attached. Your repair manual is crucial here.
2. Disconnect the Wires and Electrical Connectors:
* Carefully disconnect any electrical connectors attached to the ICM. Note the location and orientation of each connector before disconnecting so you can reconnect them correctly later. Take pictures if it helps.
* Some connectors may require a gentle tug or the use of a small flat-head screwdriver to release them. Avoid using excessive force to prevent damage.
3. Remove the ICM:
* Depending on the mounting style:
* If bolted to the distributor: Unscrew and remove the bolts that hold the ICM to the distributor. This may involve removing the distributor cap to provide better access to the bolts and ensure you do not inadvertently damage other components.
* If bolted to the firewall: Unscrew and remove the bolts holding the ICM in place.
* Snap-fit: If it's a snap-fit design, gently pry it loose using a flat, non-metallic tool.
4. Install the New ICM:
* Reverse the removal process.
* Make sure the new ICM is correctly seated and securely fastened.
* Reconnect all the electrical connectors in their original locations. Ensure a firm and secure connection.
5. Reconnect the Battery Terminal:
* Carefully reconnect the negative battery terminal.
6. Test the Ignition System:
* Start your Blazer and check for proper engine operation. If the problem persists, you might need to investigate other causes (distributor, crankshaft position sensor, etc.).
Important Considerations:
* Repair Manual: A service manual specific to your 1995 Chevy S-10 Blazer is invaluable. It will provide diagrams, torque specifications, and precise instructions to avoid damaging your vehicle.
* Correct Part: Ensure you purchase the correct ICM for your specific engine and vehicle year. The wrong ICM may not work correctly and could damage other components.
* Safety: Always disconnect the negative battery terminal before working on the ignition system to prevent accidental shocks or damage.
* Professional Help: If you're not comfortable working on your vehicle's electrical system, it's best to take it to a qualified mechanic.
This information is for guidance only. Always refer to your vehicle's repair manual for specific instructions and safety precautions. Incorrect installation can lead to further damage or injury.
