GM Camaro/Firebird 1993-1998 Repair Guide

Throttle Body

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REMOVAL & INSTALLATION



3.4L Engine

See Figures 1, 2 and 3

  1. Disconnect the negative battery cable.
  2.  
  3. Partially drain the radiator into a suitable container, to a level to allow the coolant hoses at the throttle body to be disconnected.
  4.  
  5. Remove the air inlet duct from the throttle body and disconnect the crankcase vent pipe at the valve cover grommet.
  6.  
  7. Unplug the IAC and TPS electrical connectors.
  8.  
  9. Tag and detach the vacuum harness connector from the throttle body.
  10.  
  11. Disconnect the accelerator, throttle valve (transmission control) and cruise control cables, as applicable.
  12.  
  13. Disconnect the coolant hoses from the throttle body.
  14.  



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Fig. Fig. 1: Location of the throttle body identification numbers-3.4L engine

  1. Unfasten the throttle body attaching bolts, then remove the throttle body from the plenum.
  2.  



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Fig. Fig. 2: Exploded view of the throttle body mounting-3.4L engine

  1. Discard the gasket and thoroughly clean the gasket mating surfaces. Be careful when cleaning the old gasket from aluminum surfaces as sharp tools may damage the sealing surfaces.
  2.  



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Fig. Fig. 3: Note that the TP sensor and IAC valve are mounted to the throttle body-3.4L engine

To install:
  1. Position a new gasket on the plenum, then install the throttle body. Tighten the bolts to 20 ft. lbs. (27 Nm).
  2.  
  3. Connect the coolant hoses to the throttle body.
  4.  
  5. Engage the accelerator, throttle valve and cruise control cables, as necessary. Make sure that the linkages do not hold the throttle open.
  6.  
  7. Attach the vacuum harness connector.
  8.  
  9. Plug the IAC and TPS electrical connectors into their sockets.
  10.  
  11. Attach the air inlet duct to the throttle body and connect the crankcase vent pipe to the valve cover grommet.
  12.  
  13. Connect the negative battery cable and refill the radiator.
  14.  
  15. With the engine OFF , check to see that the accelerator pedal is free. Depress the pedal to the floor and release.
  16.  

3.8L Engine

See Figure 4

  1. Disconnect the negative battery cable.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system into a suitable container. Close the draincock.
  6.  
  7. Disconnect the air intake tube.
  8.  
  9. Detach the TP, MAF and ECT sensor electrical connectors.
  10.  
  11. Remove the accelerator control cable bracket.
  12.  
  13. Remove the accelerator control and cruise control cables.
  14.  
  15. Unfasten the retaining nuts and bolts, then remove the throttle body from the intake manifold.
  16.  



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Fig. Fig. 4: On the 3.8L engine, the throttle body is mounted to the side of the intake manifold

Do NOT use any type of solvent when cleaning the gasket surface of the intake manifold and throttle body, as it may cause damage to the surfaces.

  1. Discard the gasket and thoroughly clean the gasket mating surfaces. Be careful when cleaning the old gasket from aluminum surfaces as sharp tools may damage the sealing surfaces.
  2.  

To install:
  1. Position a new throttle body gasket on the intake manifold, then place the throttle body on top of the gasket.
  2.  
  3. Install the throttle body retaining nuts and bolts and tighten to 7 ft. lbs. (10 Nm).
  4.  
  5. Attach the ECT, MAF and TP sensor electrical connectors.
  6.  
  7. Install the accelerator and cruise control cables.
  8.  
  9. Check for complete throttle opening and closing positions by depressing the accelerator pedal. Also check that the carpet fit under the pedal is OK. The throttle should operate freely without binding between full closed and wide open throttle.
  10.  
  11. Install the accelerator control cable bracket.
  12.  
  13. Attach the air intake tube.
  14.  
  15. Connect the negative battery cable and refill the radiator.
  16.  

5.7L Engine

See Figures 5 through 10

  1. Disconnect the negative battery cable.
  2.  
  3. Partially drain the radiator into a suitable container, to a level to allow the coolant hoses at the throttle body to be disconnected.
  4.  
  5. For 1996 and later vehicles, detach the IAT sensor electrical connector and the distributor ventilation vacuum line from the air intake duct.
  6.  
  7. Disconnect the air intake duct.
  8.  
  9. Detach the TP sensor and IAC valve electrical connectors.
  10.  
  11. Tag and disconnect the vacuum lines from the throttle body.
  12.  



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Fig. Fig. 5: All throttle bodies are stamped with an identification number-1993 vehicle shown, others similar



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Fig. Fig. 6: Exploded view of the throttle body and related components-1993 5.7L engine shown



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Fig. Fig. 7: Throttle body and related components-1995-98 5.7L engines

  1. Disconnect the coolant hoses from the throttle body.
  2.  
  3. If equipped, detach the electrical harness from the accelerator cable shield. Remove the accelerator cable shield, then disconnect the accelerator control cable(s).
  4.  



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Fig. Fig. 8: Unfasten the accelerator cable shield retaining bolts ...



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Fig. Fig. 9: ... then remove the accelerator cable shield



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Fig. Fig. 10: Disconnect the accelerator control cables

  1. Unfasten the throttle body attaching bolts, then remove the throttle body and flange gasket.
  2.  
  3. Discard the gasket and thoroughly clean the gasket mating surfaces. Be careful when cleaning the old gasket from aluminum surfaces as sharp tools may damage the sealing surfaces.
  4.  

To install:
  1. Position a new gasket, then install the throttle body. Install the retaining bolts and tighten to 11 ft. lbs. (15 Nm).
  2.  
  3. Connect the accelerator control cable(s).
  4.  
  5. Attach the coolant hoses to the throttle body.
  6.  
  7. Connect the vacuum lines, as tagged before removal.
  8.  
  9. Attach the electrical connectors to the TP sensor and IAC valve.
  10.  
  11. Install the accelerator cable shield. Attach the electrical harness to the shield, if equipped.
  12.  
  13. Install the air intake assembly.
  14.  
  15. If applicable, connect the distributor ventilation vacuum line to the air intake duct and attach the IAT sensor electrical connector.
  16.  
  17. Refill the radiator to the proper level.
  18.  
  19. Connect the negative battery cable. With the ignition OFF , depress the gas pedal to the floor and release to make sure the pedal is free.
  20.  
  21. Reset the IAC valve pintle position, as follows:
    1. Depress the accelerator pedal slightly.
    2.  
    3. Start and run the engine for 5 seconds.
    4.  
    5. Turn the ignition OFF for 10 seconds.
    6.  
    7. Restart the engine and check for proper idle operation.
    8.  

  22.  

 
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