Chrysler RAM50/D50/Arrow 1979-1993 Repair Guide

Coasting Air Valve (CAV) System



See Figures 1 and 2

In order to decrease the HC emissions emitted during deceleration, the coasting air valve (CAV) which is activated by the carburetor ported vacuum supplies additional air into the intake manifold.

The activation of the CAV is suspended by opening the solenoid valve, when the engine speed sensor detects engine speeds at or below the specified value, in order to keep smooth vehicle operation in transient phase and not to cause unexpected engine stalling.

The solenoid valve and the engine speed sensor are commonly used for the air switching valve system.

Click image to see an enlarged view

Fig. Fig. 1: The coasting air valve and air switching valve or on the side of the carburetor

Click image to see an enlarged view

Fig. Fig. 2: Coasting air valve system schematic