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Astra J 1.6 Rocker Cover Issue??

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28K views 12 replies 12 participants last post by  J W  
Does it have a rubber circle at the back under the plastic clip on lid? Looks like a diaphragm of sorts. It's a PCV valve which is quite prone to failure on the Chevrolet Cruze models in the US which share the 1.4/1.6 engines. A split in that means a new rocker cover. It can be diagnosed by covering it while idling. No air should pass through it so if you can feel air coming out it's time for a new one


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