Dodge Omni/Horizon/Rampage 1978-1989 Repair Guide

Throttle Body

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REMOVAL & INSTALLATION



  1. Disconnect the negative battery cable. Remove the nuts attaching the air cleaner adaptor to the throttle body, loosen the hose clamps, and remove the air cleaner adaptor.
  2.  
  3. Remove the three control cables accelerator, accelerator and, if so-equipped, automatic transaxle kickdown and speed control cables. Then remove the throttle cable bracket from the throttle body.
  4.  



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Fig. Fig. 1 Throttle body components

  1. Note locations and then disconnect the electrical wiring.
  2.  
  3. Note their locations or, if necessary, label them and then disconnect the vacuum hoses from the throttle body.
  4.  
  5. Remove the throttle body-to-adaptor attaching nuts. Then, remove the throttle body and its gasket.
  6.  

To install:

  1. Clean gasket surfaces and install a new gasket. Instal the throttle body-to-adaptor attaching nuts and tighten them alternately and evenly.
  2.  
  3. Reconnect the vacuum hoses, checking the routing and making certain the connections are secure. Reconnect each electrical harness to its location on the throttle body.
  4.  
  5. Install the throttle and, as necessary, transaxle kickdown and speed control cables. Install the air cleaner adaptor. Reconnect the battery.
  6.  

ADJUSTMENTS



Idle Speed

WARNING
This procedure applies to vehicles built through 1986. Later models require a ""Throttle Body Minimum Airflow Check Procedure". This cannot be performed without utilizing an expensive electronic test system. If airflow is incorrect on these models, the throttle body must be replaced.

Before adjusting the idle on an electronic fuel injected vehicle the following items must be checked:



AIS motor has been checked for operation.
 
Engine has been checked for vacuum or EGR leaks.
 
Engine timing has been checked and set to specifications.
 
Coolant temperature sensor has been checked for operation.
 

Once these checks have been made and you know these components are performing satisfactorily:

  1. Install a tachometer.
  2.  
  3. Warm up engine to normal operating temperature (accessories off).
  4.  
  5. Shut the engine OFF and disconnect the radiator fan.
  6.  
  7. Disconnect the throttle body 6-way harness. Remove the brown with white tracer AIS wire from the connector and reattach.
  8.  
  9. Start the engine with the transaxle selector in park or neutral.
  10.  
  11. Apply 12 volts to AIS brown with white tracer wire. This will drive the AIS fully closed and the idle should drop.
  12.  
  13. Disconnect then reattach the coolant temperature sensor.
  14.  
  15. With transaxle in neutral, idle speed should be 750-800 rpm, (725-775 rpm green engine).
  16.  
  17. If idle is not to specifications adjust idle air bypass screw.
  18.  
  19. If idle will not adjust down, check for vacuum leaks, AIS motor damage, throttle body damage, or speed control cable adjustment.
  20.  

 
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