Lexus Car ES, IS, LS 1998-06

Throttle Body

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Removal & Installation



4.0L Engine

A (factory adjusted) set screw is used to mechanically limit the position of the throttle body throttle plate. Never attempt to adjust the engine idle speed using this screw. All idle speed functions are controlled by the Power train Control Module (PCM).

  1. Remove air cleaner tube at throttle body.
  2.  
  3. Disconnect throttle body electrical connectors at MAP sensor, IAC motor and TPS .
  4.  
  5. Remove all control cables from throttle body (lever) arm.
  6.  
  7. Remove four throttle body mounting bolts.
  8.  
  9. Remove throttle body from intake manifold.
  10.  
  11. Discard old throttle body-to-intake manifold gasket
  12.  

To install:

Click image to see an enlarged view

Fig. Throttle body location on the 4.0L engine

  1. Clean mating surfaces of throttle body and intake manifold.
  2.  
  3. Install new throttle body-to-intake manifold gasket.
  4.  
  5. Install throttle body to intake manifold.
  6.  
  7. Install four mounting bolts. Tighten bolts to 100 inch lbs. (11 Nm).
  8.  
  9. Install control cables.
  10.  
  11. Install electrical connectors.
  12.  
  13. Install air cleaner at throttle body
  14.  

4.7L Engine
  1. Remove the air duct and air resonator box at throttle body.
  2.  
  3. Disconnect throttle body electrical connectors at IAC motor and TPS.
  4.  
  5. Remove vacuum line at throttle body.
  6.  
  7. Remove all control cables from throttle body (lever) arm.
  8.  
  9. Remove three throttle body mounting bolts.
  10.  
  11. Remove throttle body from intake manifold.
  12.  

To install:

Click image to see an enlarged view

Fig. Throttle body, sensors and electrical connectors for the 4.7L engine

  1. Clean throttle body-to-intake manifold O-ring.
  2.  
  3. Clean mating surfaces of throttle body and intake manifold.
  4.  
  5. Install throttle body to intake manifold by positioning throttle body to manifold alignment pins.
  6.  
  7. Install three mounting bolts. Tighten bolts to 105 in. lbs. (12 Nm).
  8.  
  9. Install control cables.
  10.  
  11. Install vacuum line to throttle body.
  12.  
  13. Install electrical connectors.
  14.  
  15. Install air duct/air box at throttle body.
  16.  

 
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