GM Cutlass RWD 1970-1987 Repair Guide

Fast Idle Solenoid Adjustment

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1978-79

  1. Set the parking brake and block the drive wheels.
  2.  
  3. Run the engine to normal operating temperature.
  4.  
  5. Place the transmission in Drive and disconnect the compressor clutch wire. Turn the A/C ON. On cars without A/C, disconnect the solenoid wire, and connect jumper wires to the solenoid terminals. Ground one of the wires and connect the other to a 12 volt battery to activate the solenoid.
  6.  
  7. Adjust the fast idle solenoid plunger to obtain 650 rpm.
  8.  

1980 & LATER



  1. With the ignition OFF, disconnect the single green wire from the fast idle relay located on the front of the firewall.
  2.  
  3. Set the parking brake and block the drive wheels.
  4.  
  5. Start the engine and adjust the solenoid (energized) to the specifications on the underhood emission control label.
  6.  
  7. Turn off the engine and reconnect the green wire.
  8.  

 
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