Tools You'll Likely Need:
* Socket wrench set (metric)
* Ratchet
* Extensions
* Torque wrench (to tighten the sensor to the correct specification – consult your repair manual)
* Jack and jack stands (crucial for safety)
* Wheel chocks
* Penetrating oil (like PB Blaster)
* Rags or shop towels
* Possibly a small pry bar or screwdriver (depending on the sensor's access)
* New crankshaft position sensor (ensure it's the correct part number for your specific engine)
Procedure:
1. Safety First: Disconnect the negative battery terminal. This prevents accidental shorts and protects the vehicle's electrical system. Raise the vehicle securely using a jack and jack stands, and engage the parking brake and wheel chocks.
2. Locate the Sensor: The CKP sensor's location varies slightly depending on the engine (3.1L or 3.8L V6). Consult a repair manual specific to your Grand Prix's engine for the exact location. It's typically found on the engine block near the crankshaft pulley, often on the passenger side.
3. Access the Sensor: You might need to remove some components to gain better access to the sensor. This could involve removing parts like the splash shield or other engine components. Again, your repair manual will be your best guide here.
4. Disconnect the Electrical Connector: Carefully unplug the electrical connector from the CKP sensor. Sometimes a small tab needs to be pressed to release the connector.
5. Remove the Sensor: The sensor is usually held in place by a bolt or two. Spray penetrating oil on the bolt(s) if they're seized. Use the appropriate socket and carefully remove the bolt(s). The sensor might be slightly difficult to remove; gently wiggle it free.
6. Clean the Area: Clean the sensor mounting area on the engine block with a clean rag to remove any dirt or debris.
7. Install the New Sensor: Carefully install the new crankshaft position sensor, ensuring it's seated correctly. Tighten the bolt(s) to the manufacturer's specified torque. Again, consult your repair manual for the correct torque specification. Over-tightening can damage the sensor or the engine block.
8. Reconnect the Electrical Connector: Securely plug the electrical connector back onto the new sensor.
9. Reassemble: Reinstall any components you removed to gain access to the sensor.
10. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
11. Reconnect the Battery: Reconnect the negative battery terminal.
12. Test the Vehicle: Start the engine and check for any error codes using an OBD-II scanner. A properly functioning CKP sensor should allow the engine to start and run smoothly.
Important Notes:
* Repair Manual: A repair manual specific to your 1997 Pontiac Grand Prix SE is strongly recommended. It will provide detailed diagrams, torque specifications, and step-by-step instructions tailored to your vehicle.
* Part Number: Ensure you purchase the correct crankshaft position sensor for your engine. Providing your VIN to an auto parts store is the most reliable way to get the correct part.
* Safety: Remember that working under a vehicle can be dangerous. Always use jack stands and follow safe lifting procedures.
This is a general guide. The specifics might vary slightly depending on your car's exact configuration. Always consult a repair manual for accurate and detailed instructions. If you're uncomfortable with any of these steps, seek professional help from a qualified mechanic.
