To "replace the computer" (ECM/ECU) on a 1985 Buick Skylark, you'd need to:
1. Identify the correct ECM: This is crucial. The ECM is specific to the engine and options on your Skylark. You'll need to find the part number on the existing unit or use the vehicle identification number (VIN) to determine the correct replacement. A parts store or online retailer specializing in classic car parts will be your best resource.
2. Disconnect the battery: This is a vital safety precaution to prevent electrical shorts and damage.
3. Locate the ECM: It's usually mounted somewhere under the hood, often near the firewall or on the inner fender. Consult a repair manual specific to your 1985 Buick Skylark to pinpoint its location.
4. Disconnect connectors: Carefully disconnect all electrical connectors attached to the ECM. Take pictures or make notes of their positions to ensure correct reconnection.
5. Remove the ECM: Depending on its mounting, this might involve removing screws or bolts.
6. Install the new ECM: Mount the new ECM in the same location, ensuring it's securely fastened.
7. Reconnect connectors: Carefully reconnect all the electrical connectors, matching them to their original positions based on your notes or photos.
8. Reconnect the battery: Reconnect the battery terminals.
9. Test the system: Start the engine and check for any error codes or unusual operation. A scan tool (often available at auto parts stores) might be necessary to diagnose any issues.
Important Considerations:
* Repair Manual: A factory service manual for your specific year and model Skylark is highly recommended. It will provide detailed diagrams, locations, and procedures.
* Professional Help: If you're not comfortable working with car electronics, it's best to take your Skylark to a qualified mechanic specializing in older vehicles. Improper installation can cause further damage.
* Used vs. New: Finding a used ECM might be more economical, but it carries a higher risk of failure. A new or remanufactured unit offers more reliability.
* Programming: Some ECMs might require programming to match your vehicle's specifications. This often requires specialized tools and knowledge.
In short, while the process is conceptually similar to swapping computer parts, the complexity and specific requirements are far greater. Always prioritize safety and consult reliable resources before attempting this repair.
