Isuzu Cars and Trucks 1981-1991

Throttle Body

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REMOVAL AND INSTALLATION
Except V6 Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air intake duct.
  4.  
  5. Drain the engine coolant below the throttle body assembly.
  6.  
  7. Disconnect accelerator cable, vacuum and coolant hoses.
  8.  
  9. Remove the four throttle body attaching bolts and throttle body assembly.
  10.  

To install:

  1. Clean the gasket mating surfaces with a scraper and solvent.
  2.  
  3. Install the four throttle body attaching bolts and throttle body assembly.
  4.  
  5. Connect accelerator cable, vacuum and coolant hoses.
  6.  
  7. Refill the engine coolant.
  8.  
  9. Install the air intake duct.
  10.  
  11. Connect the negative battery cable and check for leaks.
  12.  



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Fig. Intake manifold and throttle body assembly G200Z and 4ZC1-T engine

V6 Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Relieve the fuel pressure and remove the air cleaner.
  4.  
  5. Disconnect the throttle body electrical connectors.
  6.  
  7. Disconnect the throttle cable, transmission cable and cruise control cable.
  8.  
  9. Remove the cable support brackets.
  10.  
  11. Label and disconnect the vacuum hoses.
  12.  
  13. Using a backup wrench, disconnect the fuel pressure and return lines.
  14.  
  15. Remove the TBI attaching bolts, TBI unit and gasket.
  16.  
  17. Place a shop towel in the intake manifold openings to prevent dirt from entering the engine.
  18.  



Click image to see an enlarged view

Fig. Throttle body removal V6 engine

To install:

  1. Clean the gasket mating surfaces.
  2.  
  3. Install the new gasket, TBI unit and bolts. Torque the bolts to 18 ft. lbs. (25 Nm).
  4.  
  5. Install the fuel lines with new O-ring gaskets. Torque the lines to 20 ft. lbs. (27 Nm).
  6.  
  7. Connect the vacuum hoses.
  8.  
  9. Install the cable support bracket.
  10.  
  11. Install the throttle, transmission and cruise control cables.
  12.  
  13. Connect all electrical wiring. Make sure the connectors are fully seated and latched.
  14.  
  15. Install the air cleaner and connect the battery cable.
  16.  
  17. Reset the IAC pintle by depressing the accelerator pedal slightly, start the engine and run for three seconds, turn the ignition OFF for ten seconds, restart the engine and check for proper idle.
  18.  

 
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