Cock the parking brake, start the engine, warm up it to normal working temperature and leave working at single turns.
Disconnect the PCV valve by a detachment of a ventilating hose from a cover of a head of cylinders.
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Having pressed a finger to an entrance opening of a hose, make sure of presence of depression at it.
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Remove the valve and blow in an entrance opening of bigger diameter, - air should pass freely, then blow in an entrance opening of smaller diameter, - air to be passed through the valve should not.
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The defective valve is subject to replacement, - track correctness of connection of the valve at installation.
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