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28/09/2021 4:29 am
Topic starter
Hi I have an Opel Astra J GTC 2012 model with 130 000km on the clock. I have noticed a strong vacuum in the engine and it causes a hissing sound by the oil refill cap. When I remove the oil refill cap while the engine is running I can feel the engine sucking the cap to the point that I struggle to remove the cap. I’m not sure if I should worry about this? I don’t know what an engine vacuum means in a vehicle and how I can stop this from happening?
Thanks in advance for the help.
2 Answers
3
28/09/2021 4:55 am
Change the PCV valve.
1
28/09/2021 9:04 pm
The vacuum is by design. The PCV system scavenges crankcase gases and burns them in the combustion process. If you have a PCV valve and haven't changed it in the last 50,000 mi then do that.
