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Thread: Knocking noise as car is turning off

  1. #1
    Registered Member

    06 MazdaSpeed 6

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    Knocking noise as car is turning off

    When turing off the car, a knocking/clunking noise is present as the engine slows down and stops. Any insight to this? I'm not even bothering taking it to Mazda. Its always "cannot duplicate issue".

  2. #2
    Registered Member Nigelo's Avatar

    Mazda 3 MPS

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    subbed! I get this on my speed3 too!

  3. #3
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    06 MazdaSpeed 6

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    Really. Thats interesting. I'm tired of hearing it. I take extremely good care of my car, so I'm completely unsure.

  4. #4
    Registered Member LBV's Avatar


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    You're not talking about the clicking and whirring you hear from the throttle body for about 5 sec or so when the car is turned off are you?
    2007 White MazdaSpeed 6 sold ... new wheels = G8 GXP manual.

  5. #5
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    No not that. I had a mazda tech explain to me what that noise is. This noise appears as the engine is slowing down to a stop, not after its completely stopped. It typically dies down when the car reaches a normal operating temp. Turning off the car when its cold, sounds like the engine is going to drop to the street. But it drives fine.
    Last edited by desertmike680; 03-09-2010 at 09:39 PM.

  6. #6
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    2006 Speed6

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    First post after lurking here - but I actually have the same problem in my '06. When you turn off the car cold you can feel the engine move (only way to really describe it). I don't know if this could be a motor mount issue, but it drives and shifts just fine.

  7. #7
    Registered Member MS6_OH's Avatar

    MazdaSpeed6

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    my car does what you discribe, more or less, even after its all warmed up. Pretty much everytime shutting it off, you feel and hear the engine seem to become unbalanced. Sounds similar to a plane propeller stopping (but obviously not as dramatic). Never thought too much into it, a few ms3's that i test drove did a similar shutdown.

  8. #8
    Guest20182
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    I'm wondering if it's something to do with the engine being in the 3rd phase (power) and reaching ignition just as your turning off the motor?

  9. #9
    Registered Member KrGsMrNKusinagi's Avatar

    Mazdaspeed 6 GT

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    Its hard to diagnose problems just by what you explain.. Especially engine noise you need to post video or audio..

  10. #10
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    06 MazdaSpeed 6

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    Ok, everyone else seems to know what I'm talking about. I'm not sure why you dont. Its pretty damn obvious.

  11. #11
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    Quote Originally Posted by desertmike680 View Post
    Ok, everyone else seems to know what I'm talking about. I'm not sure why you dont. Its pretty damn obvious.
    Hi,

    I realize this is an old post but I have this problem too. It seems its common on the mazda 3's. Mine too is serviced regularly and looked after. It almost sounds like a rod knocking noise. Do you or anyone else have any idea about this problem?

    Thanks

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