Durango 2WD V8-5.7L Hybrid (2009)
Valve Deactivation Solenoid: Description and Operation
MDS System - Description
DESCRIPTION
The Multiple Displacement System (MDS) provides cylinder deactivation during steady-speed, low-acceleration and shallow grade climbing conditions
to increase fuel economy.
MDS can provide a 5-20 percent fuel economy benefit when operating in four-cylinder mode, depending on driving habits and vehicle usage. For EPA
rating purposes, fuel economy is 8-15 percent higher than if the engine was operating on eight cylinders at all times.
MDS is integrated into the basic engine architecture, requiring a minimum of additional parts - four additional solenoids, an oil temperature sensor and a
wire harness. Eight unique valve lifters and a modified camshaft are also required.
