Hyundai Coupes/Sedans 1994-1998 Repair Guide

Fuel Injectors

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REMOVAL & INSTALLATION



See Figures 1 through 9



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Fig. Fig. 1: The fuel injector is held in place on the fuel rail by an O-ring and a grommet. An insulator holds the fuel injector on the intake manifold.



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Fig. Fig. 2: Label the injector wiring harness prior to removing them from the injectors



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Fig. Fig. 3: On some models, the injector harness is held onto the injector with a small clip



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Fig. Fig. 4: Loosen the fuel rail attaching bolts after disconnecting all components attached to the fuel rail



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Fig. Fig. 5: Once the fuel charging assembly is loose, the injectors may be removed one at a time....



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Fig. Fig. 6: ....or the whole charging assembly may be removed as an assembly



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Fig. Fig. 7: Injectors are held in place on the intake manifold by insulators....



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Fig. Fig. 8: ....and on the fuel charging assembly by O-rings



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Fig. Fig. 9: The O-rings are easily damaged and should be replaced each time the injectors are removed

  1. Remove the fuel charging assembly.
  2.  
  3. Remove the injectors from the rail by pulling gently. Discard the lower insulator.
  4.  

To install:
  1. Install a new grommet and O-ring to the injector. Coat the O-ring with light oil.
  2.  
  3. Install the injector to the fuel rail.
  4.  
  5. Install a new insulator in the intake manifold.
  6.  
  7. Install the fuel charging assembly
  8.  

TESTING



See Figures 10 and 11

Removal of the fuel injectors is not necessary to test them. To test the injectors you will need an automotive stethoscope and/or an ohmmeter.

Operational Check


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Fig. Fig. 10: Using a mechanic's stethoscope, touch the injector body and listenfor the injector operating sound at idle speed. You should hear a distinct"ticking'' sound at a steady interval as the solenoid valve opens and closes

  1. Start the engine and allow it to idle.
  2.  
  3. Using a mechanic's stethoscope, touch the injector body and listen for the injector operating sound at idle speed. You should hear a distinct "ticking'' sound at a steady interval as the solenoid valve opens and closes. Listen to all injectors.
  4.  
  5. Have the assistant increase the engine speed and listen again. The ticking interval should increase in proportion to the increase in engine speed. Again, perform this test on all injectors.
  6.  

Sometimes the sound from an adjacent injector will be transmitted to another injector across the delivery pipe. In this case a bad injector will appear to be working fine. To avoid this, make sure the tip of the stethoscope is placed directly on the injector body and does not bridge the delivery pipe.

Resistance Check


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Fig. Fig. 11: Measure resistance between injector terminals. If the resistance reading is not as specified, injector may be faulty

  1. Disconnect the fuel injector electrical harness.
  2.  
  3. Measure resistance between injector terminals.
  4.  
  5. Resistance should be 13-16 ohms @ 68°F.
  6.  
  7. If the resistance reading is not as specified, injector may be faulty.
  8.  

 
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