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Cam cover under pressure help

1K views 1 reply 2 participants last post by  pault_99 
#1 ·
Hi Guys

My astra Z18XER (140k km) cam cover under vacuum, struggled to get the oil cap off clearly sucking a vacuum.
Replaced the rocker cover, checked the hoses but the poblem stil persist any ideas
 
#2 ·
Thats correct, the whole crankcase is under vacuum when the engine is running. Thats by design and the whole point of the PCV system.
Vapours from the crankcase are pulled straight into the inlet manifold (under vacuum), and burnt to reduce emissions.
 
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