2012 Acura MDXFACTORY OEM SERVICE PROCEDURE

Injector Replacement

  1. Relieve the fuel pressure (see FUEL PRESSURE RELIEVING ).
  2. Remove the intake manifold (see INTAKE MANIFOLD REMOVAL AND INSTALLATION ).
  3. Disconnect the quick-connect fitting (A) (see FUEL LINE/QUICK-CONNECT FITTING REMOVAL ).
    Fig 1: Identifying Quick-Connect Fitting, Fuel Rails Connectors And Fuel Rail Mounting Bolts
    G08057167Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. Remove the fuel joint hose mounting bolt (B).
  5. Disconnect the connectors (C) from the injectors.
  6. Remove the fuel rail mounting bolts (D) from the fuel rails (E).
  7. Remove the fuel rail and the injectors from the injector base.
  8. Remove the injector clips (F) from the fuel rail.
  9. Remove the injectors from the fuel rails.
  10. Coat the new O-rings (black) (A) with clean engine oil, and insert the injectors (B) into the fuel rails (C).
    Fig 2: Identifying Injectors, Fuel Rails And O-Rings
    G08057168Courtesy of AMERICAN HONDA MOTOR CO., INC.
  11. Install the injector clips (D).
  12. Coat the new injector O-rings (brown) (E) with clean engine oil.
  13. Install the fuel rails and injectors in the injector base (F).
  14. Install the fuel rail mounting bolts, and connect the connectors on the injectors.
  15. Install the fuel joint hose mounting bolt.
  16. Connect the quick-connect fitting (see FUEL LINE/QUICK-CONNECT FITTING INSTALLATION ).
  17. Turn the ignition switch to ON (II), but do not operate the starter. After the fuel pump runs for about 2 seconds, the fuel rail will be pressurized. Repeat this two or three times, then check for fuel leaks.
  18. Install the intake manifold with a new gasket (see INTAKE MANIFOLD REMOVAL AND INSTALLATION ).
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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