Dear.
can u explain it in details.
regards,
Hi,
Initially, pls check/clean/replace (if warranted) PCV valve and the vent hose it is attached to. Further, it may help to have the compression of your engine checked. Pls post back results.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Allow me to be clear, to my knowledge most Volvos have a flame trap, it is the equivalent of PCV valve. This might be of additional information should you be interested.
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