Smoke during normal deceleration

Discussion in 'Mazdaspeed 3 Troubleshooting' started by tmillner, Sep 7, 2016.

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  1. VTMongoose

    VTMongoose John/MD1032 Gold Member

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    Furthermore the intake side valve seals are far more likely to leak because the intake valves see strong vacuum (and boost in our cars as well) whereas the exhaust valves don't really see any significant vacuum or pressure.

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    VTMongoose, via a mobile device, Oct 20, 2016
    #21
  2. tmillner

    tmillner Greenie Member

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    Hmm why didn't i think of that? I would probably do intake and exhaust seals anyway. I'll probably order and pull both manifolds to check. If they're needed they go in. Anything else i should be looking for?

    I will try the borescope first.

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    tmillner, via a mobile device, Oct 20, 2016
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  3. tmillner

    tmillner Greenie Member

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    To answer your question oil seems to be on the center of the piston

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    tmillner, via a mobile device, Oct 20, 2016
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  4. Slow6_pl

    Slow6_pl Greenie Member

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    That's why I ask questions, because of answers like that and don't get asshole responses. Thank you very much @mangosmoothie
     
    Slow6_pl, via a Samsung mobile device, Oct 21, 2016
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  5. tmillner

    tmillner Greenie Member

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    Now the question is rebuild the whole motor, would need to wait 6 months, or do seals now?

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    tmillner, via a mobile device, Oct 24, 2016
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  6. BuddySpeed3

    BuddySpeed3 Greenie N00B Member

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    Hey man, I have the same turbo and I'm experiencing the same issue. My guess is that with my 3" catless exhaust, oil is being pulled past the turbo seal, mainly during high rpm deceleration due to a lack of back pressure, although I'm not entirely sure.

    Smoking at WOT has been greatly reduced ever since I went with a dual vented catch can setup and oil breather cap, but I still have this smoking issue during mid to high rpm deceleration. Whether I go into boost or not prior to decelerating doesn't matter. Did you end up finding a solution to this issue? Thanks :)
     
  7. tmillner

    tmillner Greenie Member

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    Ended up being broken piston ringlands. After I did valve seals ended up spinning a bearing so tore the engine apart that's how I found it
     
    tmillner, via a mobile device, Nov 8, 2018
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  8. BuddySpeed3

    BuddySpeed3 Greenie N00B Member

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    Oh so the valve seals didn't fix it eh?
    Were you catted at the time?
    Did you get to a point where you just decided to live with the smoking on decel?
     
  9. tmillner

    tmillner Greenie Member

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    They didn't help, I was catless at the time. I spun a bearing so I did a full rebuild
     
    tmillner, via a mobile device, Nov 8, 2018
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  10. BuddySpeed3

    BuddySpeed3 Greenie N00B Member

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    So now with the new rebuild has the smoke stopped?
     
  11. tmillner

    tmillner Greenie Member

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    Yeah, new bearings pistons rods etc
     
    tmillner, via a mobile device, Nov 8, 2018
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  12. BuddySpeed3

    BuddySpeed3 Greenie N00B Member

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    That's interesting, I was just curious whether the S4 is more susceptible to smoking with a catless exhaust, because I know it is with high crankcase pressure. I did a leak down test a month ago, and with the engine hot each cylinder had less than 3% leakage. This makes me think my ring lands are in good shape. I just gotta figure out why it blows blueish white smoke during mid to high rpm deceleration and then dissipates after a few seconds.
     
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