Captiva

Crankcase Ventilation System Description - LE5 or LE9

A crankcase ventilation system is used to consume crankcase vapours in the combustion process instead of venting them to atmosphere. Fresh air from the inlet system is supplied to the crankcase, mixed with blow-by gases and then passed through a calibrated orifice into the inlet manifold.

The primary control is through the positive crankcase ventilation (PCV) orifice which meters the flow at a rate depending on inlet vacuum. The PCV orifice is an integral part of the camshaft cover. If abnormal operating conditions occur, the system is designed to allow excessive amounts of blow by gases to back flow through the crankcase vent into the intake system to be consumed by normal combustion.

A plugged orifice may cause the following conditions:

A leaking orifice may cause the following conditions: