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  1. #1
    Join Date
    Sep 2007
    Pretoria, South Africa

    Default How do I check the PCV?

    I know this has been described before, but I cannot seem to find the method how to test if the PCV system is shot (i.e. too much pressure in the crankcase).

    In the last two weeks, driving only a touch more than 300 miles, the oil level has dropped from the top mark on the oil dipstick to the lower mark - and I have checked it out - there are NO obvious oil leaks so I assume that one possible culprit is the PCV system.

    What else could it possibly be?

    2016 V40 D4 AT
    2010 XC60 3.0T AT
    2004 Mazda Miata 1.8 - My new toy and restoration project ... Not everything you do in life has to be rational!

    Gone: 2015 V40 D3 AT, 2002 V70XC 2.4T AT, 2007 S60 2.5T Manual, 2004 S60 2.0T Manual, 1996 850 GLT Manual

  2. #2
    Join Date
    Mar 2005
    Pacific Northwest


    Here is a good youtube video describing the idle+boost PCV circuits

    Here is a good video to show the "pulled dipstick" and "glove" test on any 850. Same on these P2s. May need to secure the glove with a rubber band when revving engine to 2000 RPM to check the boost circult. Don't know how much vacuum suction under boost but don't want to glove to get sucked in. wrap a glove over the dipstick will achieve the same result and might be safer under boost. Make sure only either dipstick or oil filler is open and not both when testing as noted in this video.
    Past Volvos : 01 V70 T5, 01/02 V70XC, 02 V70 NA, 00 V70XC
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