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The Mitsubishi Evo X is known for its impressive performance and tuning potential. One of the most effective upgrades for enhancing power is the installation of larger fuel injectors. This guide will walk you through the step-by-step process of installing Precision 550cc injectors on your Evo X.
Preparation and Tools Needed
Before you start, it’s essential to gather all necessary tools and materials. Here’s what you’ll need:
- Precision 550cc fuel injectors
- Socket set
- Torque wrench
- Screwdrivers (flathead and Phillips)
- Fuel line disconnect tool
- Shop towels
- Safety glasses
- New O-rings (if not included with injectors)
Ensure you have a clean workspace and wear safety glasses to protect your eyes during the installation.
Step 1: Relieve Fuel System Pressure
Before working on the fuel system, it’s crucial to relieve the fuel pressure. Follow these steps:
- Open the hood and locate the fuel pump fuse in the fuse box.
- Start the engine and let it run until it stalls.
- Remove the fuel pump fuse and crank the engine for a few seconds to ensure all pressure is released.
Step 2: Remove Engine Cover
To access the fuel rail and injectors, you must remove the engine cover. Here’s how:
- Locate the bolts securing the engine cover and use a socket wrench to remove them.
- Carefully lift the engine cover off and set it aside.
Step 3: Disconnect Fuel Lines
With the engine cover removed, you can now disconnect the fuel lines:
- Use the fuel line disconnect tool to detach the fuel lines from the fuel rail.
- Have shop towels ready to catch any residual fuel.
Step 4: Remove the Fuel Rail
Next, you’ll need to remove the fuel rail to access the injectors:
- Unscrew the bolts holding the fuel rail in place using a socket wrench.
- Carefully lift the fuel rail off the engine, ensuring the injectors come out with it.
Step 5: Remove Old Injectors
Now that the fuel rail is removed, it’s time to take out the old injectors:
- Gently pull the old injectors out of the fuel rail.
- If the O-rings stick, use a flathead screwdriver to carefully pry them out.
Step 6: Install New Precision 550cc Injectors
With the old injectors removed, you can now install the new Precision 550cc injectors:
- Lubricate the new O-rings with a small amount of engine oil.
- Insert the new injectors into the fuel rail, ensuring they fit snugly.
Step 7: Reinstall Fuel Rail
After installing the new injectors, it’s time to reinstall the fuel rail:
- Align the fuel rail with the intake manifold and press down gently to seat the injectors.
- Secure the fuel rail by tightening the bolts to the manufacturer’s specifications using a torque wrench.
Step 8: Reconnect Fuel Lines
Once the fuel rail is secured, reconnect the fuel lines:
- Push the fuel lines back onto the fuel rail until they click into place.
- Ensure all connections are tight and secure.
Step 9: Reinstall Engine Cover
With everything connected, you can now reinstall the engine cover:
- Place the engine cover back onto the engine.
- Tighten the bolts to secure it in place.
Step 10: Test for Leaks and Start Engine
Before finishing, it’s important to check for any fuel leaks:
- Turn the ignition to the “on” position without starting the engine to prime the fuel system.
- Inspect for any leaks around the injectors and fuel rail.
- If everything looks good, start the engine and let it idle for a few minutes.
After confirming there are no leaks and the engine is running smoothly, you have successfully installed your Precision 550cc injectors!
Conclusion
Installing Precision 550cc injectors on your Mitsubishi Evo X can significantly enhance its performance. This step-by-step guide provides a clear path to upgrading your fuel system, ensuring your vehicle can handle increased power demands. Always remember to follow safety precautions and consult your vehicle’s manual for specific torque specifications.