Here's a general outline of the process. This is *not* a complete guide, and specific steps may vary depending on the engine (3.1L V6 or 2.4L I4 are the most common in a '99 Malibu). Always consult a repair manual specific to your vehicle's year, make, model, and engine for detailed instructions and diagrams.
Before You Begin:
* Safety First: Disconnect the negative battery terminal to prevent electrical shorts. Fuel is highly flammable; work in a well-ventilated area, away from any open flames or sparks.
* Gather Tools: You'll need various tools including: socket set (metric), wrenches, fuel line disconnect tools, fuel injector removal tool, torque wrench, jack stands, ramps (or jack), shop rags, possibly a fuel pressure gauge, and new fuel injector seals/o-rings. A fuel pressure regulator tool might be necessary to release fuel pressure in the system.
* Obtain Repair Manual: A Chilton's or Haynes manual for your specific vehicle is highly recommended. These manuals provide detailed instructions, diagrams, and torque specifications.
General Steps (These are simplified and may not cover all situations):
1. Disconnect the Battery: This is crucial for safety.
2. Relieve Fuel Pressure: This is vital to prevent fuel spraying everywhere. The method varies depending on the car. Consult your repair manual for the proper procedure. It might involve disconnecting the fuel pump relay or using a special fuel pressure release tool.
3. Access the Fuel Injectors: This usually involves removing parts like the intake manifold, air intake system, fuel rail, and possibly other components. Your repair manual will guide you through this process.
4. Disconnect Fuel Lines and Electrical Connectors: Carefully disconnect the fuel lines (use fuel line disconnect tools to avoid damaging the lines) and the electrical connectors from each fuel injector. Note the position and order of each connector to avoid confusion during reassembly.
5. Remove Fuel Injectors: Use a fuel injector removal tool to carefully remove each injector. Be gentle to prevent damage.
6. Clean and Inspect: Inspect the fuel rail and fuel injector ports for any debris or damage. Clean them if necessary.
7. Install New Injectors: Install the new fuel injectors, ensuring they are seated correctly. Use new seals/o-rings.
8. Reconnect Fuel Lines and Electrical Connectors: Reconnect the fuel lines and electrical connectors in the same order they were removed.
9. Reinstall Components: Carefully reinstall all the components that were removed to access the fuel injectors, reversing the removal process.
10. Reconnect Battery: Reconnect the negative battery terminal.
11. Check for Leaks: Inspect the fuel lines and injectors for leaks.
12. Start the Engine: Start the engine and check for any problems or unusual noises.
Important Considerations:
* Fuel Injector O-Rings: Always replace the O-rings on the fuel injectors. Reusing old O-rings can lead to leaks.
* Torque Specifications: Use a torque wrench to tighten the bolts to the manufacturer's specifications. Over-tightening can damage parts.
* Fuel Rail Pressure: After installation, have the fuel pressure checked by a professional to ensure it's within the correct range.
This is a simplified overview. Again, do not attempt this repair unless you have experience working on vehicles and have access to a detailed repair manual for your specific 1999 Chevrolet Malibu. Incorrectly performing this repair can lead to significant damage to your vehicle or serious injury. It's often more cost-effective and safer to have a professional mechanic perform this repair.
