Diagnose fuel injector clogged Toyota Corolla

Diagnosing and Repairing Clogged Fuel Injectors on a Toyota Corolla E170 (2013-2019)

Repair Instructions

Removing and Cleaning Fuel Injectors

1. Preparation:

   • Disconnect the negative battery terminal to ensure safety.
   • Relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.

2. Remove the Fuel Rail:

   • Tools Required: Socket set, wrench.
   • Process:
     • Disconnect the electrical connectors from the fuel injectors.
     • Unbolt the fuel rail from the intake manifold.
     • Carefully pull the fuel rail along with the injectors.

3. Remove the Injectors:

   • Gently pull the injectors from the fuel rail.
   • Inspect O-rings for damage; replace if necessary.

4. Clean the Injectors:

   • If using an ultrasonic cleaner, immerse the injectors and follow the cleaner’s instructions.
   • For manual cleaning, use a fuel injector cleaning kit. Connect the kit to the fuel rail and run the cleaning solution through the system as per the kit instructions.

5. Reinstall Fuel Injectors:

   • Lubricate new O-rings with a small amount of engine oil.
   • Insert the injectors back into the fuel rail and the intake manifold.
   • Secure the fuel rail with bolts and reconnect all electrical connectors.

6. Final Checks:

   • Reconnect the negative battery terminal.
   • Start the engine and check for leaks.
   • Use the OBD-II scanner to clear any existing codes and monitor for any returning issues.

Tools Required

• OBD-II Scanner
• Flashlight and Mirror
• Fuel Pressure Gauge
• Fuel Injector Pulse Tester
• Ultrasonic Cleaner (optional)
• Fuel Injector Cleaning Kit
• Socket Set and Wrench

Conclusion

By following these diagnostic and repair steps, you can effectively diagnose and address clogged fuel injectors on a Toyota Corolla E170. Regular maintenance and use of high-quality fuel can help prevent future injector issues.