Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

Mixture Control Valve (MCV)


This procedure is only relevant to 2.0L and 2.6L engines equipped with manual transmissions.


See Figures 1 and 2

Check the valve after warming up the engine
  1. Remove the air filter.
  3. Start the engine and open and close the throttle valve quickly to check MCV operation and air suction noise.
    1. While operating the throttle lever, the MCV should pop out once and quickly close and an air suction noise should be heard.


Click image to see an enlarged view

Fig. Fig. 1: The location of the MCV on the carburetor. When the throttle lever is operated, this valve pops out once and then quickly closes

Click image to see an enlarged view

Fig. Fig. 2: A diagram of a common mixture control valve system-2.0L and 2.6L engines

  1. With the engine idling, the MCV should remain closed and no noise should be present.

  1. If the MCV does not pass these requirements, the unit should be replaced.