Acura Coupes and Sedans 1994-2000 Repair Information

Fuel Injector(s)

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REMOVAL & INSTALLATION



See Figures 1 through 7

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Fig. Fig. 1: View of a typical Acura fuel rail and injectors



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Fig. Fig. 2: Remove the fuel rail and injectors from the intake manifold



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Fig. Fig. 3: Always replace the fuel injector O-rings when ever the injectors are removed and reinstalled



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Fig. Fig. 4: Remove the injector from the fuel rail



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Fig. Fig. 5: Use a pick tool to remove the injector O-ring



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Fig. Fig. 6: Check needle and seat of the injector for carbon deposits that may inhibit the injector from closing all of the way



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Fig. Fig. 7: The fuel injectors on the Integra have a spacer and a O-ring gasket. Both must be replaced whenever the injectors have been removed


CAUTION
Fuel injection systems remain under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

  1. Disconnect the negative battery cable.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Remove the connectors from the fuel rail.
  6.  
  7. Disconnect the vacuum hose and fuel return from the fuel pressure regulator.
  8.  
  9. Loosen the retainer nuts on the fuel rail.
  10.  
  11. Remove the fuel rail.
  12.  
  13. Grasp the fuel injectors body and pull up while gently rocking the fuel injector from side to side.
  14.  
  15. Once removed, inspect the fuel injector cap and body for signs of deterioration. Replace as required.
  16.  
  17. Remove the O-rings and discard. If an O-ring or end cap is missing, look in the intake manifold for the missing part.
  18.  

To install:
  1. Install new O-rings onto each injector and apply a small amount of clean engine oil to the O-rings.
  2.  
  3. Install the injectors using a slight twisting downward motion.
  4.  
  5. Install the injector retaining clips.
  6.  
  7. Install the fuel injection supply manifold (fuel rail).
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Run the engine at idle for 2 minutes, then turn the engine OFF and check for fuel leaks and proper operation.
  12.  

TESTING



The easiest way to test the operation of the fuel injectors is to listen for a clicking sound coming from the injectors while the engine is running. This is accomplished using a mechanic's stethoscope, or a long screwdriver. Place the end of the stethoscope or the screwdriver (tip end, not handle) onto the body of the injector. Place the ear pieces of the stethoscope in your ears, or if using a screwdriver, place your ear on top of the handle. An audible clicking noise should be heard; this is the solenoid operating. If the injector makes this noise, the injector driver circuit and computer are operating as designed. Continue testing all the injectors this way.


CAUTION
Be extremely careful while working on an operating engine, make sure you have no dangling jewelry, extremely loose clothes, power tool cords or other items that might get caught in a moving part of the engine.All Injectors Clicking

If all the injectors are clicking, but you have determined that the fuel system is the cause of your driveability problem, continue diagnostics. Make sure that you have checked fuel pump pressure as outlined earlier in this section. An easy way to determine a weak or unproductive cylinder is a cylinder drop test. This is accomplished by removing one spark plug wire at a time, and seeing which cylinder causes the least difference in the idle. The one that causes the least change is the weak cylinder.

If the injectors were all clicking and the ignition system is functioning properly, remove the injector of the suspect cylinder and bench test it. This is accomplished by checking for a spray pattern from the injector itself. Install a fuel supply line to the injector (or rail if the injector is left attached to the rail) and momentarily apply 12 volts DC and a ground to the injector itself; a visible fuel spray should appear. If no spray is achieved, replace the injector and check the running condition of the engine.

One or More Injectors Are Not Clicking See Figures 8, 9, 10 and 11

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Fig. Fig. 8: Unplug the fuel injector connector



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Fig. Fig. 9: Probe the two terminals of a fuel injector to check it's resistance



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Fig. Fig. 10: Plug the correct "noid" light directly into the injector harness connector



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Fig. Fig. 11: If the correct "noid" light flashes while the engine is running, the injector driver circuit inside the PCM is working

If one or more injectors are found to be not operating, testing the injector driver circuit and computer can be accomplished using a "noid" light. First, with the engine not running and the ignition key in the OFF position, remove the connector from the injector you plan to test, then plug the "noid" light tool into the injector connector. Start the engine and the "noid" light should flash, signaling that the injector driver circuit is working. If the "noid" light flashes, but the injector does not click when plugged in, test the injector's resistance. resistance should be between 11-18 ohms.

If the "noid" light does not flash, the injector driver circuit is faulty. Disconnect the negative battery cable. Unplug the "noid" light from the injector connector and also unplug the PCM. Check the harness between the appropriate pins on the harness side of the PCM connector and the injector connector. Resistance should be less than 5.0 ohms; if not, repair the circuit. If resistance is within specifications, the injector driver inside the PCM is faulty and replacement of the PCM will be necessary.

 
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