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Home >> Mazda >> 1989 >> B2600i Base >> Repair and Diagnosis >> Engine Performance >> System >> System/Component Tests - CARBURETED >> Fuel System >> Idle Speed System >> Idle-Up System (A/T With A/C)

Idle-Up System (A/T With A/C)

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.