Here's a general overview. Always consult a repair manual specific to your 1997 Pontiac Sunfire for detailed instructions and torque specifications. These instructions are generalized and may vary slightly depending on the engine (2.2L or 2.4L).
Tools You'll Need:
* Jack and jack stands: Absolutely essential for safety.
* Wheel chocks: To prevent the car from rolling.
* Engine support bar: Highly recommended to prevent engine damage. This keeps the engine from dropping while you remove and replace the mounts.
* Sockets and wrenches (metric): Various sizes will be needed, depending on the specific bolts.
* Ratchet and extensions: To reach difficult bolts.
* Torque wrench: Crucial for tightening bolts to the correct specification. Improper torque can damage the engine or mounts.
* Pry bar or large screwdriver: May be helpful for separating rusted or stuck components.
* Penetrating oil (like PB Blaster): Soak bolts overnight if they're rusty or seized.
* New engine mounts: Get the correct ones for your Sunfire's engine.
* Gloves and safety glasses: Protect yourself from grease, oil, and flying debris.
General Steps:
1. Safety First: Park on a level surface, engage the parking brake, and chock the wheels. Raise the front of the car using the jack and securely support it with jack stands.
2. Disconnect the Battery: Disconnect the negative (-) terminal of the battery to prevent electrical shorts.
3. Access the Engine Mounts: Locate the engine mounts. The Sunfire typically has three: one on each side of the engine and one in the middle (transaxle mount). Access will require removing some underbody plastic covers or components depending on the mount.
4. Support the Engine: Use the engine support bar to securely support the engine. This is critical to prevent it from dropping and causing damage.
5. Remove the Old Mount(s): This will involve removing bolts and possibly nuts that secure the mount to the engine and the chassis. Use penetrating oil if necessary and take your time to avoid stripping the bolts. You may need to disconnect some wiring or other components depending on the specific mount's location.
6. Install the New Mount(s): Carefully install the new engine mounts, ensuring they are properly seated. Tighten the bolts according to the torque specifications in your repair manual. Do not overtighten!
7. Lower the Engine (carefully): Once the new mounts are secure, carefully lower the engine using the engine support bar. Make sure it's supported until all bolts are tightened.
8. Reconnect Everything: Reconnect any wiring or components that were disconnected.
9. Lower the Car: Carefully lower the car from the jack stands.
10. Test Drive: After reconnecting the battery, test drive the car to ensure the engine mounts are functioning correctly. Listen for any unusual noises or vibrations.
Important Considerations:
* Repair Manual: This is absolutely crucial. Generic instructions can't cover every variation.
* Rust and Seized Bolts: Older cars are prone to rusty and seized bolts. Be prepared to spend extra time soaking them with penetrating oil.
* Torque Specifications: Following the correct torque specifications is essential to prevent damage.
* Engine Support Bar: Do not attempt this without one. You risk serious engine damage.
This is a simplified overview. Consult a repair manual specific to your 1997 Pontiac Sunfire for detailed instructions and torque specifications. If you're not comfortable performing this repair yourself, take your car to a qualified mechanic. Improperly installed engine mounts can lead to serious damage.
