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Oil blowing out of valve cover

This is a discussion on Oil blowing out of valve cover within the GTO forums, part of the Vehicle Specific category; I did the famous 'Sarge' PCV catch-can and vented oil cap mod. It's been installed for over a year now. ...

  1. #1
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    2004 GTO A4

    Oil blowing out of valve cover

    I did the famous 'Sarge' PCV catch-can and vented oil cap mod. It's been installed for over a year now. Last week, I noticed some oil on my plastic valve cover-cover. Anyhow, I wiped it off thinking that maybe I spilled a bit of oil when I changed the oil last month.

    After a few days, the oil returned. I wiped it off again, and it re-appeared. It looks like it is coming out of the oil fill breather on the valve cover. Should this be happening?

  2. #2
    Member Texas Jack's Avatar
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    2006 GTO M6

    Hey Joe, Try to clean the filter up, it might be saturated with oil and will hold no more. Mine did the same thing and a little K&N cleaner did the trick.

  3. #3
    Junior Member MNGTO's Avatar
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    Quote Originally Posted by Texas Jack View Post
    Hey Joe, Try to clean the filter up, it might be saturated with oil and will hold no more. Mine did the same thing and a little K&N cleaner did the trick.
    I second that. Mine was also oil soaked and I just cleaned it. I think next time it gets that way I will replace it. Its been on for three years.

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    Thanks guy's. I will try that and see if it works.

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    So here is my update. There was a small filter in my catch can that was plugged. I removed this filter and now I seem to have a lot of vacuum 'sucking' air through the vented oil cap on the valve cover. Instead of 'blowing' oil and air out it is sucking air in.

    Just wondering....if the filter on my catch can was plugged, and the vacuum from the lifter valley was blocked, could I have created a vacuum leak now between the lifter valley and the valve cover? Any ideas?

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    Any ideas guys?

  7. #7
    cutting and welding mark21742's Avatar
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    hugger orange
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    Of say it wad clogged....you should be pulling vacuum through that vented valvecover cap
    408 stroker, pacesetter lt's, 3"dual exhaust, Edelbrock proflo intake, p&p tb, 255/266 cam, p&p & milled 241 heads, hptuners, Saginaw 3 speed, Ford 9", 4.56 gears, tubbed, battery relocation, weight reduction, racing seats, rjs harnesses, custom wide body kit, custom paint, 18x9's 245/40/18's front, 15x15's 31-18.50 15's rear

  8. #8
    Member The Silver Goat's Avatar
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    Qucik Silver Metalic
    2004 GTO - M6

    Do you have the hoses crossed? Out of the valley into the top of the catch can> From the bottom or cylinder portion of the can into the intake? Maybe??? Just a suggestion
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