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Thread: Can't figure out weird noise

  1. #1
    Registered Member

    Mazda 3

    Join Date
    May 2018

    Can't figure out weird noise

    i've got a 2012 Mazda 3 Skyactiv that's never had any sort of problems but has recently started making a strange noise. it's kind of hard to explain, but essentially what happens is any slight change in momentum results in a little popping noise that sounds like it's coming from underneath the car. for example if i launch fairly quickly, or more noticeably every time i let off the gas to switch gears there will always be a little pop the second my foot is off the pedal. also when holding a steady speed that sound will be continuous, it sounds a bit like driving over a row of little bumps.

    should also note the car runs and drives perfect like it always has; just don't like hearing un-diagnosed noises.


  2. #2
    Registered Member concept's Avatar

    2014 Mazda3 S GT auto, 2008 MX5 6-speed

    Join Date
    Mar 2009
    San Diego
    That may be an exhaust leak. Letting off the gas pedal would cause a popping noise if there is either a high-flow exhaust muffler or a leak within the exhaust routing.
    2014 3S GT, Deep Crystal Blue, Eibach Pro-Kit, Enkei PF01s, Koni Sports
    2008 MX-5 Touring (Mazdaspeed CAI, HIDs, Progress/Koni Sports/Racing Beat sways, Magnaflow)
    2002 Protege ES (Sold for $1700 with 131,000 miles)

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