1968 OLDSMOBILE Carburetor Adjustments

250" 6 Cyl. 

1. Adjust solenoid slow idle screw to obtain approx. 575 RPM.
2. With solenoid energized open throttle slightly to allow plunger to come out of solenoid. Measure distance between end of solenoid body and end of solenoid screw. Distance must be 7/8" ± 1/16". If distance is not correct adjustment is necessary.
3. Adjust solenoid slow idle screw and mixture screw alternately to obtain best idle at following idle speeds.

   1968
   Auto. Trans.	575
   Manual Trans.	725

   NOTE: Auto. Trans. idle speed set in "Drive", Manual Trans. set in "Neutral". Hot idle compensator hole must be plugged with eraser end of pencil.
4. For final setting, turn idle mixture screw in until idle speed drops off 20-25 RPM. This is final setting
   CAUTION: (Do not readjust solenoid screw).
5. Turn throttle stopscrew in until it contacts throttle lever, then disconnect solenoid lead to de-energize solenoid and adjust throttle stopscrew for idle speed of 400 RPM in Drive (Auto. Trans.) or Neutral (Manual Trans.).
6. Reconnect solenoid lead, reinstall air cleaner and reconnect vacuum line.

350" V8 

1. Adjust solenoid slow idle screw to obtain approx. 575 RPM.
2. With solenoid energized open throttle slightly to allow plunger to come out of solenoid. Measure distance between end of solenoid body and end of solenoid screw. Distance must be 7/8" ± 1/16". If distance is not correct adjustment is necessary.
3. Adjust solenoid idle stopscrew and both idle mixture screws alternately for best idle at following idle speeds:

   1968
   Auto. Trans.	575
   Manual Trans.	575

   NOTE: Auto. Trans. idle speed set in Drive, Manual Trans. set in Neutral. On air conditioned cars, hold hot idle compensator closed.
4. Turn each idle mixture screw in until idle speed drops off 10-15 RPM for final idle speed of 20-30 RPM (both screws) less than speed specified above
   CAUTION: (Do not readjust solenoid screw).
5. Turn throttle stopscrew in until it contacts throttle lever, then disconnect solenoid lead to de-energize solenoid and adjust throttle stopscrew for idle speed of 400 RPM in Drive (Auto. Trans.), or Neutral (Manual Trans.).
6. Reconnect solenoid lead, reinstall air cleaner and reconnect vacuum line. Recheck idle speed with air cleaner installed.