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  5. Idle Mixture Adjustment
  • Bring the engine to operating temperature.
  • Adjust the idle to manufactures specifications.
    • Having the idle up too high will bypass the idle circuit and adjusting the idle mixture will have not affect.
  • Hook up a vacuum gauge to a port that has steady vacuum.
  • Turn both screws out 1/2 turn - Turn the idle mixture screw out 1 1/2 turns while on the bench.
  • Turn each screw in, alternating between them, 1/4 turn at a time until you get a steady vacuum reading.

 

Another way:

  • Bring the engine to operation temperature.
  • Adjust the idle to manufactures specifications.
  • Turn both idle mixture screws out 1/2 turn.
  • Alternating between the screw turn in 1/4 turn at a time. Give the engine a second to catch up.
  • When the rpm starts to drop, turn the screw back 1/4 turn and leave it there.


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