Tools You'll Need:
* Socket wrench and sockets (likely 7mm, 10mm, and possibly others)
* Screwdrivers (Phillips and possibly flathead)
* Wire harness connector removal tool (optional, but helpful)
* New ICM (ensure you get the correct one for your specific year and engine)
* Safety glasses
* Gloves
Procedure:
1. Disconnect the Battery: This is crucial to prevent electrical shock and damage to the vehicle's electronics. Disconnect the negative (-) terminal first.
2. Locate the ICM: The ICM's location varies slightly depending on the specific model. It's usually mounted on the distributor or on the firewall near the distributor. Consult your repair manual to pinpoint its location. It's a small, usually rectangular, electronic module.
3. Disconnect the Electrical Connectors: Carefully unplug all electrical connectors attached to the ICM. A connector removal tool can help prevent damage to the connectors. Note the position of each connector so you can reconnect them correctly. Take pictures if needed.
4. Remove Mounting Hardware: Once the connectors are disconnected, remove the screws or bolts that hold the ICM in place. This might involve removing a cover or bracket first.
5. Remove the Old ICM: Carefully remove the old ICM. Be gentle to avoid damaging any components.
6. Install the New ICM: Carefully install the new ICM, ensuring it's securely seated in its mounting location. Tighten the mounting screws/bolts to the manufacturer's specified torque.
7. Reconnect the Electrical Connectors: Connect all the electrical connectors back to the new ICM, making sure each connector is securely in place and matches its previous position.
8. Reconnect the Battery: Reconnect the battery's positive (+) terminal.
9. Test the Vehicle: Start the engine and check for proper operation. Listen for smooth running and check for any unusual sounds or error codes.
Important Considerations:
* Distributor: On some models, you might need to remove the distributor cap to access the ICM.
* Grounding: Ensure the ICM is properly grounded. A poor ground can cause problems.
* Part Number: Double-check that the replacement ICM has the correct part number for your vehicle. Getting the wrong one will lead to wasted time and money.
* Professional Help: If you are uncomfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improper installation could lead to further damage.
This is a general guide. Always consult a repair manual specific to your 1988 Chevy Silverado 5.7L for detailed instructions, diagrams, and torque specifications. These instructions should not be considered a replacement for a proper repair manual. Safety is paramount, so proceed with caution.
