Genuine Mercedes-Benz C320 Intake Manifold

Mercedes-Benz C320 Intake Manifold Parts and Q&A

• Intake Manifold
  112-140-21-01
  Q: How do the design and replacement procedures for the variable intake manifold on Mercedes-Benz C320?

  A:

  The variable intake manifold system available on 2001-2005 V6 models (controlled by PCM) maximizes the engine torque by swapping between two different lengths of intake manifold between, two corresponding intake manifold runners, flapped by a pair of flap runners utilizing a diaphragm unit. When engine speed is reduced, the flaps are left open, forcing the air through shorter runners, to increase torque. At loads above 50 percent the PCM turns on the switchover valve and enables the air to pass through longer runners, which enhance cylinder charging and torque. At velocities above 3900 rpm, shorter runners are automatically switched to keep the system running. The intake manifold is improved further in V6 models in 2006 and again in subsequent V6 models, with two diaphragm units to control the flaps, and also adds more turbulence to the air within the combustion chamber with more tumble and additional flaps. In models produced up to 2005 with replacement parts needed between 2001 and 2005, the switchover valve is reached by removing the front engine cover, disconnecting the electrical connector and vacuum hoses, and then removing the valve. The unit of diaphragm is also reached and removed. In subsequent design, in 2006 and further design, the process of changing diaphragm units, and switchover valves, is to take one front engine cover, cut of the hoses and connectors and then ransack the component and the reverse of assembling the 2006, 2006 designs, replaced the component as with 2008.