180/170/150/210 Compression and Oil Leak

Discussion in 'Mazdaspeed 3 Troubleshooting' started by Manerd05, Feb 9, 2019.

2 users.
  1. Manerd05

    Manerd05 Greenie N00B Member

    Feb 9, 2019
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    Apologies if this has been posted before, I've searched quite a bit and can't find anything on it.

    A few months ago I purchased a 07 Speed3 with 130k miles on it.

    Recently, it started throwing white smoke out of the exhaust, which we believe is the result of the turbo seals failing and letting a substantial amount of oil through the intercooler and into the engine intake (Enough to puddle up/Completely coat the tube).

    A few days ago when I was driving, the car started misfiring and was struggling to idle, so we checked the spark plugs (Which are completely black) and did a compression test, which turned out to be 180/170/150/210. What would cause such an extreme pressure difference from cylinders 3 to 4?

    The car behaves normally until it gets warmed up, where it then starts to misfire and struggles to idle.

    Is there any way that these issues could be related? What are some potential causes?

    Thanks for the help!
    Last edited: Feb 9, 2019
  2. mangosmoothie

    mangosmoothie Platinum Member

    Sep 14, 2016
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    Low compression on cyl 3 is notorious. Could an issue with the rings. Try doing a wet test and see if the compression comes up. As for high comp on cyl 4, could be carbon.

    You can also try a top end soak with X66P. @MS3brohanna did that in her old car, and it actually restored compression. @HawkeyeGeoff has a write up on how to do it somewhere. But she never had the driveability issues you did.

    Make sure the plugs are capped to like .028 or lower. Any stored codes? Can you check long term fuel trims at idle?
    mangosmoothie, via a mobile device, Feb 9, 2019
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