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Idle Speed & Mixture

  1. Engine should be at normal operating temperature and oil filler cap must be tightly sealed. Connect CO level meter to pick-up point on catalytic converter and connect tachometer to ignition control box Black/Purple wire.
  2. Disconnect plug from oxygen sensor on left side of engine compartment. Turn idle by-pass screw on throttle housing to obtain correct idle RPM. If mixture must be adjusted, remove plug from mixture control unit.
  3. Insert adjusting tool and rotate clockwise for richer mixture and counterclockwise for leaner mixture. Rotate slowly without pressing down on adjusting tool. Be sure to plug opening before accelerating engine or testing mixture.
  4. Accelerate engine briefly. Allow idle to stabilize before taking readings. When CO level is correct, check idle speed and readjust if necessary. Remove test equipment, coat threads of test point cap (on converter) with anti-seize compound, and reconnect oxygen sensor.
    IDLE SPEED & CO LEVEL

    Application Idle RPM CO%
    All Models 850-950 0.4-0.8
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