Here's a general overview of the process. This is NOT a complete guide and should not be used as a substitute for a factory service manual specific to your Blazer's year and engine. Always consult your vehicle's repair manual for detailed instructions and torque specifications.
Before You Begin:
* Safety First: Disconnect the negative battery terminal before starting any work.
* Gather Tools and Parts: You'll need a complete set of metric sockets and wrenches, a fuel pressure gauge, fuel line disconnect tools, new fuel injectors (ensure they're the correct ones for your engine), new fuel injector O-rings and seals, rags, a clean work area, and possibly a fuel injector cleaning kit or ultrasonic cleaner (for cleaning the used injectors if you choose to reuse them—not recommended).
* Vehicle Preparation: Work on a level surface. You might need to raise the vehicle and support it securely on jack stands.
Steps (General Overview):
1. Disconnect the Battery: Disconnect the negative battery terminal.
2. Fuel System Pressure Relief: Refer to your service manual for the precise procedure to relieve fuel pressure in the system. This is crucial to prevent fuel spraying.
3. Access the Fuel Injectors: This varies drastically depending on the engine and year of your Blazer. You'll likely need to remove parts like the air intake system, possibly the intake manifold (a major undertaking), and potentially parts of the fuel rail.
4. Disconnect Fuel Lines and Electrical Connectors: Carefully disconnect the fuel lines from the fuel rail using appropriate fuel line disconnect tools. Disconnect the electrical connectors from the fuel injectors.
5. Remove the Fuel Injectors: Carefully remove the fuel injectors from the fuel rail. Pay close attention to the position and orientation of each injector. You might need to use a small pry tool (carefully!) to help release them. Take note of any markings or clips.
6. Inspect and Replace O-rings and Seals: Replace the O-rings and seals on the fuel injectors before installing the new ones.
7. Install New Fuel Injectors: Install the new fuel injectors into the fuel rail, ensuring they are correctly seated and oriented.
8. Reconnect Fuel Lines and Electrical Connectors: Carefully reconnect the fuel lines and electrical connectors to the new fuel injectors.
9. Reassemble: Reassemble all components you removed to access the fuel injectors in the reverse order of removal. Refer to your service manual for torque specifications.
10. Reconnect Battery: Reconnect the negative battery terminal.
11. Check for Leaks: Carefully inspect all fuel connections for leaks.
12. Start the Engine: Start the engine and check for any unusual sounds or behavior. Look for leaks.
13. Fuel System Diagnosis (Possibly): After installation, consider having a professional perform a fuel system diagnosis to ensure proper operation and identify any issues. This might involve a fuel pressure test or other diagnostic procedures.
Important Considerations:
* Year and Engine: The exact procedure will vary significantly depending on the year and engine of your Chevy Blazer. The steps above are a generalized overview.
* Service Manual: A factory service manual specific to your Blazer's year and engine is absolutely essential. It will provide detailed instructions, diagrams, torque specifications, and other crucial information.
* Professional Help: If you're not comfortable performing this repair yourself, take your Blazer to a qualified mechanic. Improperly installed fuel injectors can cause serious engine damage.
This information is for guidance only and does not constitute professional advice. Always consult a qualified mechanic or your vehicle's service manual before attempting any repairs.
