Deceleration Spark Advance

When engine speed sensor detects 1600-2000 RPM (1400-1800 RPM on 2.6L engines), it activates solenoid valve movement. This changes intake manifold vacuum to carburetor ported vacuum, maintaining smooth vehicle operation.

Fig 1: Coasting Air Valve

Courtesy of CHRYSLER GROUP, LLC

Fig 2: Deceleration Spark Advance System

Courtesy of CHRYSLER GROUP, LLC