4.9.1 Description
The engine has a Positive Crankcase Ventilation (PCV) valve which is fastened to the engine. The breather is a flexible composite hose connected between the PCV valve and the induction system as shown in the diagrams below. The PCV valve prevents reverse flow into the crankcase.
Disconnection of the hose that runs between the PCV valve and the intake manifold will result in the engine becoming very unstable at idle with a tendency to stall. The OBD system will detect a fuel system fault due to the un-metered air that enters the intake manifold; please refer to the FUEL SYSTEM MONITORING section of this document for further information.