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Thread: Engine rattle on 2009 Mazda 5

  1. #1
    Registered Member

    2009 Mazda 5

    Join Date
    Jul 2017
    Location
    Ontario
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    1

    Thumbs down Engine rattle on 2009 Mazda 5

    Recently had this "rattle" sounds come from my 2009 Mazda 5. The rattle speeds up as the RPMs rise. In the video I revved to 3k RPMs and you can hear it speed up.

    Have also had some AC reliability issues but not sure if it's related.

    Seems to be coming from the back of the engine but can't pinpoint it.

    Any help would be great.

    See vid: https://www.youtube.com/watch?v=XD8E29FTy7I

  2. #2
    Registered Member

    5

    Join Date
    Jan 2017
    Location
    Texas
    Posts
    87
    It seems like generally most engine rattle sounds are due to loose heat sheld on the exhaust. Take the cover off and look at the back of the engine while it's running to see if you can see a heat shield wobbling loose.


    Sent from my iPhone using Tapatalk
    2006 Mazda5 Sport, 130K miles

  3. #3
    Registered Member

    mazda5 GT 2009

    Join Date
    May 2012
    Location
    ca
    Posts
    69
    I also have 2009 mazda 5 with 96+k miles that intermittently rattles when accelarating bet. 2-3 rpm. Beyond that the rattle disappears.

    Was it it a heat shield causing the rattle?

  4. #4
    Registered Member

    Mazda 5/2008

    Join Date
    May 2013
    Location
    Burlington, Ontario, Canada
    Posts
    5
    I have the same problem. I keep researching this for 2 years now and the noise still there. I recently change the pulley of the tensioner and the serpentine belt and the small belt due to all my research saying that if you change the tensioner and the belt the noise will be gone. like I said the noise still there no luck.

  5. #5
    Registered Member

    2009 Mazda 5 GT

    Join Date
    Sep 2017
    Location
    Indianapolis, IN
    Posts
    21
    Most likely a heat shield on the exhaust. Get under the car and hit your fist against the heat shield sections starting from the exhaust manifold going back. When you hear the familiar rattle, either separate the shield from whatever it's hitting to cause the noise or secure it more with a metal screw clamp.

  6. #6
    Registered Member

    2012 Mazda 5 Grand Touring

    Join Date
    Apr 2018
    Location
    NC
    Posts
    4
    I have similar rattle sounds, but it only occurs when AC is on. It never happens otherwise. It's impossible to diagnose, because it will not happen in P when idling.

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