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Mixture Control Valve (MCV)

Remove air cleaner. Bring engine to normal operating temperature. Open and close throttle valve quickly to check MCV operation and air suction noise. See Fig 1 .
MCV should open and suck air when throttle valve is quickly opened or closed. During idling condition, MCV valve should be closed with no sucking noise heard.

Fig 1: Excel Mixture Control Valve

Courtesy of HYUNDAI MOTOR CO.