Here's a general overview of the process. This is NOT a complete, step-by-step guide, and specific procedures may vary slightly depending on your engine (e.g., 4.8L, 5.7L). Consult a repair manual specific to your 1999 Chevrolet Tahoe's engine for detailed instructions and torque specifications.
Safety Precautions:
* Disconnect the negative battery terminal before starting any work.
* Work in a well-ventilated area. Fuel fumes are flammable and hazardous.
* Use proper safety equipment: eye protection, gloves, and possibly a respirator.
* Have a fire extinguisher readily available.
* Properly dispose of used fuel and other fluids.
General Steps (Consult your repair manual for specifics):
1. Preparation:
* Gather necessary tools: socket set (metric), wrenches, fuel line disconnect tools, fuel injector removal tool (possibly), new fuel injectors, new fuel injector o-rings and seals, clean rags, shop towels, and a fuel pressure gauge (recommended).
* Locate the fuel injectors on the engine. They're typically on the intake manifold.
* Consult a repair manual to identify the fuel rail, fuel lines, and electrical connectors.
2. Release Fuel System Pressure:
* This is CRUCIAL. The fuel system is under pressure. Use the vehicle's schrader valve (usually near the fuel rail) to relieve pressure. Consult your repair manual for the exact location and procedure. Never attempt this without knowing how to properly do so.
3. Disconnect Fuel Lines:
* Carefully disconnect the fuel lines from the fuel rail. Have a container ready to catch any spilled fuel.
4. Disconnect Electrical Connectors:
* Unplug the electrical connectors from the fuel injectors.
5. Remove Fuel Rail:
* The fuel rail usually has bolts holding it to the intake manifold. Carefully remove these bolts and remove the fuel rail.
6. Remove Fuel Injectors:
* Carefully remove the fuel injectors from the fuel rail. You may need a special fuel injector removal tool to avoid damaging the injectors or the fuel rail. Note the orientation of each injector as you remove them; some have markings. Replace the o-rings.
7. Install New Injectors:
* Carefully install the new fuel injectors into the fuel rail, ensuring that the o-rings are properly seated.
8. Reassemble:
* Reinstall the fuel rail, making sure all bolts are tightened to the correct torque specification (see repair manual).
* Reconnect the fuel lines.
* Reconnect the electrical connectors.
9. Reconnect Battery Terminal:
* Reconnect the negative battery terminal.
10. Check for Leaks:
* Carefully inspect all connections for leaks. Start the engine and check for leaks again.
11. Clear Codes (If Necessary):
* Use an OBD-II scanner to clear any diagnostic trouble codes that may have been set.
Important Considerations:
* Fuel Injector Flow Testing: Consider having your old injectors flow-tested to determine if they were truly the cause of the problem.
* Repair Manual: This is absolutely essential for detailed instructions, torque specifications, and diagrams. A Haynes or Chilton manual for your specific vehicle is highly recommended.
This is a simplified overview. Always refer to a repair manual specific to your 1999 Chevrolet Tahoe for precise instructions and safety precautions. Improperly performing this repair could result in serious damage to your vehicle or injury to yourself. If you are unsure about any step, consult a qualified mechanic.
