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compression braking

  1. 2010-2013 Mazda 3 Engine and Performance
    So I've got a 2012 Mazda3 Skyactiv 6MT with about 15k miles on it. During the course of our time together I have noticed something slightly distressing - when downshifting into 2nd, the engine rev's sometimes will jump unnaturally. I can attempt to speculate about how maybe the ECU has...