GM Cutlass RWD 1970-1987 Repair Guide

1970 1 bbl.Carburetor


  1. Remove the air cleaner and run the engine until it reaches normal operating temperature.
  3. Apply the parking brake and set blocks in front and in back of the wheels.
  5. Make sure that the choke plate is fully open, and the fast idle cam follower is off the cam. If the car has an air conditioner, make sure it is off.
  7. Disconnect the air vacuum hose from the base of the carburetor and plug the fitting. Disconnect the vacuum advance hose from the distributor and plug the end of the hose. Plug the carburetor hot idle compensator.
  9. If the car has an automatic transmission, place the selector lever in Drive. If the car has a manual transmission, put it in neutral.
  11. Make sure that the solenoid wire is connected, and the throttle stop screw is not touching the throttle lever.
  13. Adjust the idle mixture to obtain the highest possible rpm. Then adjust the throttle solenoid plunger to obtain an idle speed 25 rpm above the higher of the two idle speeds listed in the tune-up specifications chart.
  15. Turn the idle mixture screw inward to lower the idle speed to the correct rpm.
  17. The lower idle speed is adjusted next. Disconnect the solenoid wire and adjust the throttle stop screw to obtain the lower of the two idle speeds shown in the chart.
  19. Re-connect all the hoses and replace the air cleaner.