This is a general outline, and specific steps may vary slightly depending on the engine (2.2L or 2.4L). Always consult a repair manual specific to your vehicle's year and engine for detailed instructions and torque specifications.
Safety First:
* Disconnect the negative battery terminal before starting any work.
* Work in a well-ventilated area. Fuel injector cleaner and fuel are flammable.
* Wear safety glasses and gloves.
Tools and Parts:
* New fuel injectors: Get the correct ones for your engine.
* Fuel injector removal tool: This specialized tool makes removing the injectors much easier. Improper removal can damage the injectors or the intake manifold.
* Socket set and wrenches: Various sizes will be needed.
* Fuel line disconnect tool: Prevents damage to fuel lines.
* Clean rags and shop towels.
* Fuel pressure gauge: To verify fuel pressure after the repair.
* Torque wrench: Essential for tightening bolts to the proper specification.
* Fuel injector o-rings and seals: These should be replaced when installing new injectors.
* Repair manual: A Chilton's or Haynes manual for your specific car is highly recommended.
* Injector cleaner: For cleaning the fuel rail and injector ports.
General Steps (Consult your repair manual for precise details):
1. Disconnect the negative battery terminal.
2. Remove the air intake system. This usually involves disconnecting various hoses and clamps.
3. Remove the fuel pressure. This is crucial for safety. Consult your repair manual on the proper procedure – it often involves disconnecting a fuel pump relay or using a fuel pressure release valve. Never attempt this without knowing the procedure.
4. Remove the fuel rail. This usually involves disconnecting fuel lines, electrical connectors, and removing bolts holding it to the intake manifold. Use the fuel line disconnect tool to prevent damaging the fuel lines.
5. Remove the fuel injectors. This is where the fuel injector removal tool is essential. The injectors are usually held in place by clips or O-rings. Be careful not to damage the injector seals.
6. Clean the fuel rail and injector ports. Use injector cleaner and compressed air to remove any debris.
7. Install the new fuel injectors. Make sure the new O-rings are properly seated.
8. Reinstall the fuel rail. Tighten all bolts to the specified torque.
9. Reconnect the fuel lines. Use the fuel line disconnect tool to prevent damaging the lines.
10. Reconnect the electrical connectors.
11. Reinstall the air intake system.
12. Reconnect the negative battery terminal.
13. Check for leaks. Start the engine and carefully inspect for fuel leaks around the injectors and fuel rail.
14. Check fuel pressure. Use a fuel pressure gauge to ensure it's within specifications.
15. Clear any diagnostic trouble codes.
Important Considerations:
* Fuel System Pressure: Improperly relieving fuel pressure can be dangerous. Follow your repair manual meticulously.
* O-rings and Seals: Replacing these is crucial to prevent leaks.
* Torque Specifications: Using a torque wrench is essential to prevent damage to the engine.
* Fuel Injector Flow Rate: Some injectors have specific flow rates. Ensure that the replacements match your engine's requirements.
Again, this is a simplified overview. Refer to a repair manual specific to your 1999 Chevrolet Cavalier for detailed instructions, diagrams, and torque specifications. Improper installation can lead to engine damage, so proceed with caution or seek professional help.
