Toyota Celica 1994-1998 Repair Guide

Throttle Body

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REMOVAL & INSTALLATION



See Figures 1 through 14



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Fig. Fig. 1: Exploded view of the common throttle body

  1. Drain and recycle the engine coolant.
  2.  
  3. Remove the air cleaner hose and cap.
  4.  
  5. Disconnect accelerator cable from the throttle linkage. Remove the 2 bolts and the cable bracket.
  6.  



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Fig. Fig. 2: Disengage the accelerator cable from the linkage ...



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Fig. Fig. 3: ... and the throttle cable from the body ...



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Fig. Fig. 4: ... along with the bracket

  1. On automatics, disconnect the throttle cable from the throttle linkage.
  2.  



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Fig. Fig. 5: Remove the bolts retaining the throttle and accelerator cables

  1. Label and disconnect the vacuum hoses.
  2.  



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Fig. Fig. 6: Mark all the vacuum hoses prior to removal

  1. Carefully remove the throttle position sensor wiring connector.
  2.  



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Fig. Fig. 7: Disconnect the throttle position and IAC sensor wiring

  1. Label and remove the water hoses from the air valve.
  2.  



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Fig. Fig. 8: It is advised to label all hoses before removing them

  1. Depending on the type of mounting refer to the following:
    1. Two bolt and nut; remove the two bolts, two nuts the throttle body with its gasket.
    2.  
    3. Four bolt; remove the four bolts. Make sure you mark where the bolts go. The bolts are different lengths on the upper and lower sides.

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      Fig. Fig. 9: Remove the 2 bolts and nuts ...



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      Fig. Fig. 10: ... and lift the throttle body off



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      Fig. Fig. 11: Discard the old gasket from the air chamber

    4.  

  2.  
  3. Wash and clean the cast metal parts with a soft brush and carburetor cleaner. Use compressed air to blow through all the passages and openings.
  4.  



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Fig. Fig. 12: Use compressed air to clean all passages and openings in the throttle body

  1. To check the throttle valve to see that there is NO clearance between the stop screw and the throttle lever when the throttle plate is fully closed.
    1. Apply vacuum to the throttle opener before inserting the feeler gauge between the throttle stop screw and the lever.

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      Fig. Fig. 13: Check the throttle valve to see that there is NO clearance between the stop screw and the throttle lever when the throttle plate is fully closed

    2.  

  2.  
  3. Inspect the throttle position sensor, refer to Driveability & Emissions Controls .
  4.  

To install:
  1. Place a new gasket in position and install the throttle body with its two nuts and two bolts. Install the throttle body (with new gasket facing the protrusion downward).
  2.  
  3. Secure the throttle body as follows:
    1. The four bolt type; upper side bolts are 1.77 inch (45mm) and lower side bolts are 2.17 inch (55mm). all bolts are tightened to 14 ft. lbs. (19 Nm).
    2.  
    3. The two bolt and nut style, install and secure to 14-16 ft. lbs. (19-21 Nm). with the 2 bolts and nuts and tighten.Make certain everything is properly positioned before securing the unit.

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      Fig. Fig. 14: Place the new gasket on the air intake chamber with the protrusion facing downward

    4.  

  4.  
  5. Attach all wiring to each labeled component.
  6.  
  7. Connect the all water and vacuum hoses.
  8.  
  9. Install the air cleaner cap and hose.
  10.  
  11. Connect the wiring to the throttle position sensor.
  12.  
  13. Connect the accelerator cable and its return spring.
  14.  
  15. Refill the coolant to the proper level.
  16.  
  17. Connect the negative battery cable.
  18.  
  19. Start the engine and check operation of the throttle body.
  20.  

 
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