Toyota Pick-ups/Land Cruiser/4Runner 1970-1988

Throttle Body

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REMOVAL & INSTALLATION



See Figure 1


CAUTION
Any time a high fuel pressure line is disconnected, a large amount of gasoline will spill out. Always slowly loosen the connection and place a container under it. Plug the connection afterwards.

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine coolant.
  4.  
  5. Tag and disconnect all lines, hoses or wires that lead from the throttle body. Position them out of the way. Remove the air intake connector and the air cleaner hose.
  6.  
  7. Unscrew the mounting bolts and remove the throttle body and gasket.
  8.  

To install:
  1. Install the throttle body using a new gasket and tighten the mounting bolts to 9-13 ft. lbs. (12-18 Nm).
  2.  
  3. Connect the air cleaner hose and the air intake connector.
  4.  
  5. Reconnect all lines, hoses and wires.
  6.  
  7. Fill the engine with coolant and connect the battery cable.
  8.  



Click image to see an enlarged view

Fig. Fig. 1: Typical throttle body

CHECKING



All Engines
  1. Check that the throttle linkage moves smoothly.
  2.  
  3. Start the engine and remove the hose from the vacuum port.
  4.  
  5. With your finger, check that there is no vacuum at idle and that there is vacuum at anything other than idle.
  6.  
  7. Unplug the electrical connector from the throttle position sensor.
  8.  
  9. Insert a flat feeler gauge between the throttle stop screw and the stop lever.
  10.  
  11. Using an ohmmeter, check the continuity between each terminal on the sensor.
  12.  
  13. Check the dash pot as detailed previously in this section and also in Engine Performance and Tune-up .
  14.  

 
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