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Thread: Replaced CCV, still smoking at start up??

  1. #1
    Join Date
    Jan 2019
    Location
    Ct
    Posts
    25
    My Cars
    2005 x3 3.0

    Replaced CCV, still smoking at start up??

    Hi guys, ccv failed when I tried to leave work last week...tried keeping the car running at first but just kept smoking, shuddering and stalling. I had it towed home and replaced the CCV with a new one and new pipes over the weekend. I also replaced the spark plugs figuring not only where they 60k miles old but also the burning oil event could not have done them any favors. Well I started the car and it still smoked and stumbled and billowed a few clouds until it warmed up. Once warm it idled fine with no significant smoke. I took it for a drive and all seemed ok. The next day I started it cold and it smoked again and would not idle I revved it and restarted it for about a minute and finally it cleared up...I left it idling for 15 mins...no issue. My question is what could be causing the smoking at cold start when I have the whole new CCV circuit? Is this residual oil elsewhere that’s still being burned up? It seems like it’s worst when cold and at low rpm. Thanks - Nate

  2. #2
    Join Date
    Jan 2017
    Location
    USA
    Posts
    284
    My Cars
    E21, E46
    Use a smoke machine check for vacuum leaks. Smoke on cold startup is typically valve stem seals. Smoke otherwise might be piston rings.

  3. #3
    Join Date
    Jan 2019
    Location
    Ct
    Posts
    25
    My Cars
    2005 x3 3.0
    Dang...looks like you are correct...all my symptoms are identical to those of bad stem seals...wish I looked deeper into that before assuming it was CCV.

  4. #4
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    Depending what weight oil you are running you could try a slightly higher number

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