Table of Contents
Installing Nismo 555cc injectors on your Z32 300ZX can significantly improve performance and fuel delivery. This step-by-step guide will walk you through the installation process to ensure your vehicle runs optimally.
Tools and Materials Needed
- Nismo 555cc injectors
- Socket set
- Torque wrench
- Fuel line disconnect tool
- Shop towels
- Engine oil
- Safety glasses
- Gloves
Preparation
Before starting the installation, ensure your vehicle is parked on a flat surface and the engine is cool. Gather all necessary tools and materials to avoid interruptions during the process.
Step 1: Relieve Fuel Pressure
To prevent fuel spills, relieve the fuel pressure in the system. Locate the fuel pump fuse in the fuse box and remove it. Start the engine and let it run until it stalls. This will ensure that the fuel pressure is relieved.
Step 2: Disconnect the Battery
Disconnect the negative terminal of the battery to prevent any electrical shorts while working on the fuel injectors.
Step 3: Remove the Intake Manifold
To access the fuel injectors, you need to remove the intake manifold. Begin by disconnecting any electrical connectors, vacuum hoses, and throttle cables attached to the manifold. Use a socket set to remove the bolts securing the manifold and carefully lift it off.
Step 4: Remove the Fuel Rail
Next, you will need to remove the fuel rail. Disconnect the fuel lines using the fuel line disconnect tool. Be cautious as some fuel may still be present. Remove the bolts securing the fuel rail and gently lift it out along with the injectors.
Step 5: Replace the Injectors
With the fuel rail removed, you can now replace the old injectors with the new Nismo 555cc injectors. Apply a small amount of engine oil to the O-rings of the new injectors to ensure a proper seal. Insert the new injectors into the fuel rail, ensuring they are seated correctly.
Step 6: Reinstall the Fuel Rail
Carefully place the fuel rail with the new injectors back into position. Secure the fuel rail with the bolts you removed earlier. Reconnect the fuel lines, ensuring they are properly seated and secured.
Step 7: Reinstall the Intake Manifold
Now it’s time to reinstall the intake manifold. Carefully align it back on the engine and secure it with the bolts. Reconnect any electrical connectors, vacuum hoses, and throttle cables that were previously disconnected.
Step 8: Reconnect the Battery
Once everything is reassembled, reconnect the negative terminal of the battery. Ensure all connections are tight and secure.
Step 9: Test for Leaks
Before starting the engine, turn the ignition key to the “on” position without starting the engine. This will prime the fuel system. Check for any fuel leaks around the injectors and fuel rail. If there are no leaks, you are ready to start the engine.
Step 10: Start the Engine
Start the engine and let it idle for a few minutes. Monitor the engine for any irregular sounds or leaks. If everything sounds normal, take the car for a test drive to ensure the new injectors are functioning properly.
Conclusion
Installing Nismo 555cc injectors on your Z32 300ZX can enhance your vehicle’s performance. By following this step-by-step guide, you can successfully replace your injectors and enjoy the benefits of improved fuel delivery and engine efficiency.