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Positive crankcase ventilation hose
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Positive crankcase ventilation valve
The 1.7 Zetec-S VCT engine is fitted with a positive crankcase ventilation system. The system consists of a valve mounted into a separator (attached to the cylinder block) and two hoses. One hose connects the valve to the intake manifold. The second hose connects the cam cover to the air cleaner
Under idle and part throttle conditions, crankcase vapor flows into the intake manifold where the vapor is burnt during combustion. Under full throttle conditions, the vapor flows into the air cleaner via the cam cover. During this condition there is no fresh air circulation from the air cleaner to the cam cover.