Mixture Control Valve

Check valve after engine is warmed to operating temperature. Remove air filter. Start engine and open and close throttle valve quickly. Mixture control valve should pop out once and quickly close. Air suction noise should be heard. With engine at idle, valve should remain closed and no air suction should be heard.

Fig 1: Deceleration Spark Advance System

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Mixture Control Valve

Courtesy of CHRYSLER MOTORS.