Hi. They have to take care of the damage caused. For what you comment there is an excessive pressure load that will cause leaks not only in the valve cover gasket but also in engine seals and seals, even the crankshaft pulley. An obstruction / modification in the PCV will not allow the recirculation of gases to the admission to be burned causing harmful conditions for the engine. The internal membrane of this valve has a diaphragm allowing the passage in only one direction, the hydrocarbons, the temperature and the amount of dirt degrade it affecting it and closing the passage, only its replacement is necessary. In any case it is first necessary to restore the faulty connection and verify that the circuit is connected. Salu2.