![Positive crankcase ventilation (pcv valve). An ignition engine must have a vent valve for internal and external air pressure | CanStock Positive crankcase ventilation (pcv valve). An ignition engine must have a vent valve for internal and external air pressure | CanStock](https://cdn.w600.comps.canstockphoto.com/positive-crankcase-ventilation-pcv-eps-vectors_csp61776335.jpg)
Positive crankcase ventilation (pcv valve). An ignition engine must have a vent valve for internal and external air pressure | CanStock
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