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  1. should I check for carbon deposits before changing spark plugs?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    So it's that time for new spark plugs. It's actually 3k miles past the recommended interval (75k). My main concern is carbon deposits on the intake valves. After searching, I've learned that the best way to know you have carbon deposits is to take off the intake manifold and the best way to...
  2. intake valve deposits

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Has anyone tried CRC GDI IVD cleaner. It's a new product for oil buildup on the back side of intake valves in direct injected engines.
  3. 2015 2.5l engine oil deposits?

    2014-2018 Mazda 3 Skyactiv Engine and Performance
    Hey all, Just got my 2015 Mazda 3 S touring about 2 months ago, did my first oil change at 2582 miles. I drained the factory oil fill, and I found a big chunk of what looks like engine oil sludge? pretty sure thats not supposed to be in there, now im worried if there is already any damage to...
  4. Skyactiv Owners Beware: Intake Valve Deposits!

    2010-2013 Mazda 3 Engine and Performance
    With the known fact that some other manufacturers' direct injection engines suffer from power/economy robbing deposits on the intake valves, I decided to see if the Skyactiv G 2.0L in our Mazda 3's was also prone to this issue. These deposits form from oil vapors vented into the intake by the...
  5. increased deposits for direct injection more significant than we thought??!!

    2010-2013 Mazda 3 Engine and Performance
    2011 mazda 3 2.0 auto. Seems like a while now I keep asking myself hmmm is it a little rougher? Is that a bit of a misfire? Does it crank a little longer than it used to? Is the motor pulling through the powerband and calibrating shifts that compliment this motor as effectively as it used to? I...