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Thread: Oil on spark plug threads! 2007 CTS 2.8

  1. #1
    Join Date
    May 2012

    Oil on spark plug threads! 2007 CTS 2.8

    2007 CTS 2.8, 90k

    So I have had an on again of again misfire issue, mostly only when I first start the car. I changed the plugs, which fixed the issue, but there was oil on the threads of my plugs! As far as I can tell it was on the threads and not in the tubes. There was also some oil in the tube connecting to the black box which attaches to the throttle body. After doing some research I'm thinking maybe it is the valve cover gaskets? How hard is it to swap these out and is it worth attempting for a novice do it yourselfer? Is there a TSB that someone can link me to on this issue? Is there a how to thread? Thanks for your help!!

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  3. #2
    Join Date
    May 2012

    Re: Oil on spark plug threads! 2007 CTS 2.8


  4. #3
    Blayne's Avatar
    Blayne is offline Cadillac Owners Connoisseur
    Automobile(s): 2006 CTS sport model/package
    Join Date
    Sep 2012
    Sudbury, Ontario Canada
    If your valve cover was leaking you would have oil visible around the base of the spark plug when looking down at it. Oil on the threads isn't uncommon. Keep an eye on that one plug. Run the car for a few weeks and then get in there and check it out. If you can see oil in there then yes the gasket needs to be changed. If it is dry carry on with it. The gaskets shouldn't be a hard job. Changing the plugs gets you half way there. A few more steps and you are at the gaskets. Unsure about a write up on the procedure. As for the oil in the baffle that goes to the TB, that is normal. Theses cars produce a lot of PVC oil/gases that get sent thru the rubber line that attaches to the intake tube right after the MAF. The result is an oily residue on the intake pipe, baffle and TB. No worries about it but you should look into an RX catch can. And while you are doing the gaskets, an RX isolator would be a nice and easy upgrade.

  5. #4
    Argent1's Avatar
    Argent1 is offline Cadillac Owners Connoisseur
    Automobile(s): '07 CTS 3.6
    Join Date
    Nov 2010

    Re: Oil on spark plug threads! 2007 CTS 2.8

    Perhaps you should check out the PCV mod as well, while you're in there. It works on the 3.6, not sure if the 2.8 has the same set up.

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