DECEL Valve System: Description

A conventional decel valve system is used on 2300 cc and 2800 cc (automatic transmission) engines and a speed modulated decel valve system on 2800 cc (manual transmission) engines. All 2000 cc engine equipped models with manual transmissions use a decel valve with a vacuum connection at bottom of valve. Decel valve supplies additional air/fuel mixture to engine during periods of deceleration (high intake manifold vacuum when throttle valve is closed). Conventional decel valve is controlled by engine vacuum while speed modulated decel valve is controlled by vehicle speed through a connection to speedometer cable.