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Collapsed PCV hose will block, or restrict, the PCV Valve Vacuum flow

Even original equipment hoses sometimes give problems. This is common on Ford and some Mazda vehicles. The hose chosen is not adequate for the task and after miles of use it will collapse. When this occurs, flow to pcv valve system stops and the hole in the supply hose may create a vacuum leak. Inspect all hoses in the PCV system and replace any that appear soft, swollen or collapsed.

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