GM Cadillac Deville_Fleetwood_ELD_Seville 1990-1998

Throttle Body

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REMOVAL & INSTALLATION



3.0L Engine

The throttle body contains a dual throttle valve that controls the amount of air delivered to the engine. A coolant passage under the throttle valve heats the throttle.

The Throttle Position (TP) sensor is mounted on the throttle body. The TP sensor and minimum air stop are not adjustable.


NOTE
Collect the coolant that escapes from the throttle body hoses. Drain the coolant to a sufficient level or collect the coolant as necessary.

  1. Disconnect the negative battery cable.
  2.  
  3. Loosen the hose lamps at the throttle body inlets.
  4.  
  5. Disconnect the air ducts from the throttle body.
  6.  
  7. Loosen the hose clamp and disconnect the air hose for the IAC valve.
  8.  
  9. Remove the accelerator cable.
  10.  
  11. Disconnect the Cruise control cable.
  12.  
  13. Loosen the hose clamps and disconnect the coolant hose from the throttle body.
  14.  
  15. Detach the TP sensor harness connector
  16.  
  17. Disconnect the Brake servo vacuum line.
  18.  
  19. Remove the bolt cover caps from the intake plenum.
  20.  
  21. Remove the fastening bolts for intake plenum.
  22.  
  23. Carefully pull the intake plenum upwards-note the seal rings between intake plenum and intake bridge.
  24.  


NOTE
Mask the intake ducts-entry of foreign objects can cause severe engine damage.

  1. Remove the throttle body to intake fastening bolts.
  2.  
  3. Remove the throttle body from the intake plenum.
  4.  


NOTE
Note the difference in seal rings for the throttle body and for the engine vent adapter. Use new seal rings on installation.

To install:



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Fig. View of the throttle body showing the seal rings

  1. Install the throttle body to the intake plenum -ensure the correct sealing.
  2.  
  3. Install/tighten the throttle body to the intake plenum fasteners.
  4.  
  5. Place 6 new seals on the intake bridge-ensure that installation positions are correct.
  6.  
  7. Install the intake plenum onto the intake bridge -ensure the correct sealing.
  8.  


NOTE
The intake bridge has two guide pins for aligning the intake plenum.

  1. Tighten the bolts for the intake plenum.
  2.  
  3. Reinstall the volt cover caps.
  4.  
  5. Connect the brake servo vacuum line.
  6.  
  7. Connect the cruise control cable and accelerator cable.
  8.  
  9. Ensure that the air ducts are properly positioned on the throttle body inlets and tighten the hose clamps.
  10.  
  11. Attach the TP sensor electrical connector.
  12.  
  13. Check and add coolant as necessary.
  14.  
  15. Connect the negative battery cable.
  16.  

4.5 and 4.9L Engines
  1. Properly relieve the fuel system pressure.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise the hood, install fender covers, and remove the air cleaner assembly.
  6.  
  7. Detach the electrical connectors for the idle speed control motor, the throttle position sensor, fuel injectors, EFE, and any other component necessary in order to remove the throttle body.
  8.  
  9. Remove the throttle return spring, cruise control, throttle linkage and downshift cable.
  10.  
  11. Disconnect all necessary vacuum lines, the fuel inlet line, fuel return line, brake booster line, MAP sensor hose and the AIR hose. Be sure to use a back-up wrench on all metal lines.
  12.  
  13. Remove the PCV, EVAP, and/or EGR hoses from the front of the throttle body.
  14.  
  15. Remove the 3 throttle body mounting screws and remove the throttle body and gasket.
  16.  
  17. The installation is the reverse order of the removal procedure.
  18.  
  19. Tighten the throttle body retaining bolts to 14 ft. lbs. (19 Nm). Always use new gaskets and O-rings.
  20.  
  21. Make certain cruise and shift cables do not hold the throttle above the idle stop. Reset the IAC by depressing the accelerator slightly, run engine for 3-4 seconds and turn ignition OFF for 10 seconds.
  22.  



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Fig. Throttle body identification-4.5L and 4.9L engines



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Fig. Throttle body assembly-4.5L and 4.9L engines



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Fig. Throttle Body Unit-4.5L and 4.9L engines

4.6L Engine


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Fig. Intake manifold and throttle body components-4.6L engine



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Fig. Intake manifold and throttle body-4.6L engine



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Fig. Intake manifold torque sequence-4.6L engine



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Fig. Throttle Body vacuum ports-4.6L engine



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Fig. Intake manifold seals-4.6L engine

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the vacuum manifold at the throttle body and the vacuum hoses at the cruise control servo.
  4.  
  5. Disconnect the cruise control cable at the servo. The cable can be removed at the servo without removing the plastic retainer.
  6.  
  7. Remove the cruise control servo and bracket at the throttle body.
  8.  
  9. Disconnect the cruise control cable at the throttle body.
  10.  
  11. Disconnect the TP sensor at the throttle body.
  12.  
  13. Disconnect the fuel pipe retainer at the ISC bracket.
  14.  
  15. Remove the throttle body from the intake manifold.
  16.  
  17. Remove the ISC motor and bracket from the throttle body.
  18.  

To install:

  1. Install the ISC motor and bracket to the throttle body.
  2.  
  3. Position a NEW throttle body O-ring seal on the throttle body with petroleum jelly.
  4.  


NOTE
Do not reuse the old throttle body O-ring seal. The seal swells when exposed to fuel and oil and will not seat properly.

  1. Install the throttle body to the intake manifold and tighten to 106 inch lbs. (12 Nm).
  2.  
  3. Connect the fuel pipe retainer to the ISC bracket.
  4.  
  5. Connect the TP sensor to the throttle body and tighten the retaining bolts to 106 inch lbs. (12 Nm).
  6.  
  7. Connect the cruise control cable to the throttle body.
  8.  
  9. Connect the cruise control servo and bracket to the throttle body and tighten the retaining bolts to 106 inch lbs. (12 Nm).
  10.  
  11. Connect the cruise control cable at the servo.
  12.  
  13. Connect the vacuum manifold to the throttle body and the vacuum hoses to the cruise control servo.
  14.  
  15. Install the intake manifold along with the throttle body.
  16.  
  17. Perform the TP Sensor/Idle Learn procedure.
  18.  

 
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