GM Corsica/Beretta 1988-1996 Repair Guide

Throttle Body

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REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Properly relieve the fuel system pressure.
  2.  
  3. If not already done, disconnect the negative battery cable.
  4.  
  5. Remove the TBI cover and gasket.
  6.  
  7. Detach the electrical connectors from the Idle Air Control (IAC) valve, Throttle Position (TP) sensor and the fuel injector.
  8.  
  9. Remove the grommet with the wires from the TBI unit.
  10.  
  11. Disconnect the throttle linkage, return spring(s), transmission control cable and cruise control where applicable.
  12.  
  13. Tag and disconnect all vacuum hoses.
  14.  
  15. Unfasten the inlet and outlet fuel line nuts, using a back-up wrench to avoid twisting or warping the lines.
  16.  
  17. Remove the fuel line O-rings from the nuts and discard.
  18.  
  19. Remove all TBI mounting hardware and remove the TBI unit and gasket.
  20.  



Click image to see an enlarged view

Fig. Fig. 1: Throttle body-to-intake manifold attachment - 1988-91 2.0L and 2.2L engines


WARNING
To prevent damage, place the TBI unit in a holding fixture, before performing service.

  1. Stuff a clean rag in the manifold opening to prevent dirt from entering.
  2.  



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the TBI 700 assembly used on 1988-91 2.0L and 2.2L engines

To install:
  1. Clean old gasket material from the surface of the intake manifold.
  2.  
  3. Place a new gasket along with the TBI unit on the manifold and tighten the mounting hardware to 17 ft. lbs. (23 Nm) for 1988 vehicles, or to 18 ft. lbs. (24 Nm) for 1989-91 vehicles.
  4.  
  5. Use new O-rings on the fuel line nuts and install hand-tight.
  6.  
  7. Use a back-up wrench on the TBI unit and tighten the inlet and outlet nuts to 20 ft. lbs. (27 Nm).
  8.  
  9. Attach the vacuum hoses, as tagged during removal.
  10.  
  11. Connect the throttle linkage, return spring(s), transmission control cable and cruise control where applicable.
  12.  
  13. Install the grommet with the wires to the TBI unit.
  14.  
  15. Attach the electrical connectors to the IAC valve, TP sensor and the fuel injector. Make sure they are all fully seated and latched.
  16.  
  17. With the engine OFF, depress the accelerator pedal to the floor to make sure it is free.
  18.  
  19. Install the TBI cover and new gasket if necessary.
  20.  
  21. Connect the negative battery cable, then start the engine and check for leaks.
  22.  

 
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