Exhaust Gas Flap

Exhaust Gas Flap

The 12.6 liter rear silencer is fitted with an exhaust gas flap to keep noise to a minimum at engine idle speed and low rpm. The exhaust gas flap is opened allowing additional flow when:

- The a transmission gear is engaged and
- The engine speed is above 1,500 rpm

A vacuum-controlled diaphragm (actuator mounted on the silencer) opens and closes the exhaust gas flap. The exhaust gas flap is closed with vacuum, and is sprung open by the actuator (when vacuum is not present). The procedure is carried out using a solenoid valve which is electrically controlled by the
ECM.