Tools You'll Need:
* Socket wrench set: Various sizes, including metric and possibly SAE. A ratchet and extensions will be very helpful.
* Wrench set: Again, metric and potentially SAE.
* Jack and jack stands: Absolutely essential for safety. Never work under a car supported only by a jack.
* Wheel chocks: To secure the car while it's jacked up.
* Penetrating oil (PB Blaster or similar): To help loosen rusty bolts.
* Wire brush: To clean bolt heads and terminals.
* New starter motor: Make sure you get the correct one for your specific model and year.
* Gloves: To protect your hands.
* Safety glasses: To protect your eyes.
* Torque wrench (optional but recommended): For tightening bolts to the manufacturer's specifications.
Steps:
1. Safety First: Disconnect the negative battery cable. Place the wheel chocks on the wheels. Jack up the car securely using the jack points specified in your owner's manual, and place it on jack stands.
2. Access the Starter: The starter's location varies slightly depending on the exact engine configuration, but it's typically located on the driver's side of the engine, near the transmission bellhousing. You'll likely need to remove some components to get good access. This *might* include:
* Remove the air intake system: This may involve disconnecting hoses, clamps, and possibly the air filter housing.
* Remove the engine splash shield (if applicable): This is often a plastic or metal shield underneath the engine. It may require removing several bolts.
* Remove some engine-related parts: You might need to partially or fully remove various components like the exhaust manifold heat shield or other things obstructing access to the starter. Be prepared for this, and take photos as you go to help with reassembly.
3. Disconnect the Starter Wiring: Carefully disconnect the positive and negative cables from the starter. Take note of how they are connected for reassembly. Use a wire brush to clean the terminals before disconnecting.
4. Remove the Starter Bolts: The starter is typically held in place by two or three bolts. Apply penetrating oil to the bolts if they are stubborn. Use the appropriate sockets and wrenches to remove the bolts.
5. Remove the Starter: Once the bolts are removed, the starter should come free. It may be a little tight due to the weight and potential rust. Gently wiggle it free.
6. Install the New Starter: Carefully align the new starter with its mounting holes. Install the bolts and tighten them securely, but don't overtighten. If you have a torque wrench, consult your repair manual for the correct specifications.
7. Reconnect the Wiring: Reconnect the positive and negative cables to the new starter, ensuring a secure connection.
8. Reassemble: Carefully reassemble all the components you removed earlier, paying attention to how they were originally connected.
9. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
10. Reconnect the Battery: Reconnect the negative battery cable.
11. Test the Starter: Attempt to start the engine. If it doesn't start, double-check all connections and wiring.
Important Notes:
* Consult a Repair Manual: A repair manual specific to your 1990 Buick Riviera 6-cylinder automatic is highly recommended. It will provide detailed diagrams, torque specifications, and specific instructions for your vehicle. This guide is a general overview and may not cover all specifics.
* Take Pictures: Take pictures as you disassemble the components to aid in reassembly.
* Safety: Always prioritize safety. Work in a well-ventilated area. Use jack stands properly and never work under a vehicle supported only by a jack.
If you're not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Starter replacement, while doable by a competent DIYer, can be complicated if you encounter unexpected problems.
