A vacuum hose from the PCV valve to the intake manifold. Some vehicles (mostly older ones) have the PCV elsewhere. Some place the valve in a tube or box on the side of the engine block. (this was where the old crankcase draft tube was located). Some have the valve screwed into the...
Oil Leak From Rear Main Seal Although Audi doesn’t consider the PCV system a regular maintenance system, it’s well known that these parts fail regularly. The symptoms are easily diagnosed as other failures; however, the PCV system should always be checked early on in the diagnost...