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Home >> Mazda >> 1993 >> B2200 Base, 2D Pickup, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - CARBURETED >> Idle Control System >> Idle Speed System >> Idle-Up System (Auto. Trans. With A/C)
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Idle-Up System (Auto. Trans. With A/C)

  1. Warm engine to operating temperature and allow to idle. All accessories must be off. Connect tachometer to engine. Disconnect vacuum hose from lower side port of servo diaphragm. See Figure . Connect intake manifold vacuum directly to open port and verify engine speed is 1300-1500 RPM. To adjust engine speed, turn screw on servo arm.
  2. Reconnect vacuum hose to lower side port of servo diaphragm. Disconnect vacuum hose from upper port of servo diaphragm. Connect intake manifold vacuum directly to open port and verify engine speed is 920-970 RPM. If RPM is not as specified, disconnect intake manifold vacuum hose and adjust diaphragm head by turning screw.
  3. Reconnect intake manifold vacuum to upper port and recheck engine speed. When proper specification is achieved, reconnect hose to upper servo diaphragm port.
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