Mitsubishi Eclipse 1990-1998 Repair Guide

Throttle Body

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10



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Fig. Fig. 1: Exploded view of the throttle body and related components-1990-94 2.0L engine shown, 1.8L engine similar



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Fig. Fig. 2: Throttle body and related components-1995-98 2.0L non-turbo engine



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Fig. Fig. 3: Throttle body mounting-1995-98 2.0L turbo and 2.4L engines

  1. Properly relieve the fuel system pressure as outlined earlier in this section.
  2.  
  3. Drain the engine cooling system into a suitable container.
  4.  
  5. For 1995-98 2.0L turbo and 2.4L engines, disconnect the negative and positive battery cables, then remove the battery from the vehicle.
  6.  
  7. Matchmark the location of the adjuster bolt on the accelerator cable mounting flange. This will assure that the cable is installed in its original location. Remove the throttle cable adjusting bolt and disconnect the cable from the lever on the throttle body. Position cable aside.
  8.  



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Fig. Fig. 4: Disconnect the accelerator cable from the lever on the throttle body

  1. Remove the connection for the breather hose and the air intake hose from the throttle body and position aside.
  2.  



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Fig. Fig. 5: Disconnect the vacuum hose from the throttle body

  1. Tag and disconnect the necessary vacuum hoses.
  2.  
  3. Label and detach the electrical connectors at the throttle body, as necessary.
  4.  



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Fig. Fig. 6: Tag and detach the TPS connector (1) and the IAC motor connector (2)

  1. Disconnect the water and water by-pass hoses at the base of the throttle body.
  2.  
  3. If equipped, unfasten the ground plate mounting screws, then remove the throttle body stay and ground plate from the engine.
  4.  
  5. Remove the air fitting and gasket.
  6.  
  7. Unfasten the throttle body mounting bolts, then remove the throttle body from the engine. Remove and discard the gasket.
  8.  



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Fig. Fig. 7: Unfasten the throttle body-to-intake manifold retaining bolts ...



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Fig. Fig. 8: ... then remove the throttle body from the vehicle



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Fig. Fig. 9: Remove and discard the throttle body gasket, then thoroughly clean the mating surfaces

To install:
  1. Clean all old gasket material from the both throttle body mounting surfaces. Install new gasket onto the intake manifold plenum mounting surface so the projection on the gasket is as illustrated.
  2.  

Poor idling quality and poor performance may be experienced if the gasket is installed incorrectly.



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Fig. Fig. 10: During installation, make sure the throttle body base gasket is positioned properly

  1. Install the throttle body to the intake manifold plenum and tighten the mounting bolts to the specifications shown in the accompanying figures.
  2.  
  3. Install the air fitting, if equipped, making sure new gasket is in place.
  4.  
  5. If equipped, install the throttle body stay and ground plate. Secure with retainers tightened to 11-16 ft. lbs. (15-22 Nm). Install the ground plate mounting screw.
  6.  
  7. Connect the water hoses to the throttle body. Install new hose clamps if required.
  8.  
  9. Attach the electrical and vacuum connectors to the throttle body, as tagged during removal.
  10.  
  11. Connect the accelerator cable to the throttle body and install the adjusting bolt in original position. Check adjustment of cable.
  12.  
  13. Install the air intake and breather hoses.
  14.  
  15. If removed, install the battery and connect the positive cable.
  16.  
  17. Connect the negative battery cable. Refill the cooling system.
  18.  

CLEANING



  1. Warm the engine to operating temperature and then turn the ignition OFF .
  2.  
  3. Remove the air intake hose from the throttle body.
  4.  
  5. Plug the by-pass inlet in the throttle body.
  6.  
  7. Spray cleaning solvent into the valve through the throttle body intake port and let is stand for approximately 5 minutes.
  8.  
  9. Start the engine and race it several times. Allow the engine to idle for about 1 minute. If the idling speed becomes unstable or if the engine stalls, slightly open the throttle valve to keep the engine running.
  10.  
  11. If the deposits on the throttle valve are not removed, repeat Steps 4 and 5.
  12.  
  13. Unplug the bypass passage inlet. Attach the air intake hose.
  14.  
  15. Disconnect the negative battery terminal for 10 seconds or more and then reconnect it.
  16.  
  17. Adjust the basic idle speed, if required.
  18.  

If the engine hunts (surges) at idle after the basic idle speed has been adjusted, disconnect the negative battery cable from the battery for at least 10 seconds and then, restart the engine and allow to idle.

 
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