Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Diesel Engine

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SLOW IDLE SPEED ADJUSTMENT



  1. Run the engine until it reaches normal operating temperature.
  2.  
  3. Set the parking brake and block the drive wheels.
  4.  
  5. Remove the air cleaner and turn all accessories off.
  6.  
  7. Install a diesel tachometer.
  8.  
  9. Turn the low idle speed screw on the injection pump until the proper idle is obtained. Automatic transmissions should be in Drive and manual transmissions should be in Neutral.
  10.  
  11. Disconnect the tachometer and install the air cleaner.
  12.  

FAST IDLE SPEED ADJUSTMENT



  1. Run the engine until it reaches normal operating temperature.
  2.  
  3. Set the parking brake and block the drive wheels.
  4.  
  5. Disconnect the connector from the fast idle solenoid. Connect an insulated jumper wire between the positive battery terminal and the solenoid terminal. This will energize the terminal.
  6.  
  7. Open the throttle momentarily to ensure that the fast idle solenoid plunger is energized and fully extended.
  8.  
  9. Adjust the extended plunger by turning the hex head until the proper fast idle is obtained. The transmission should be in Neutral.
  10.  

 
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