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Cold Start Rattle

Discussion in '4th Gen - 2018 - present' started by WALoeIII, Nov 3, 2019.

  1. WALoeIII

    WALoeIII New Member

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    What is this?

     
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  2. JExpedition07

    JExpedition07 Marinized Member Supporting Member

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    Did you check for a loose heat shield?
     
  3. TobyU

    TobyU Full Access Members

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    Sounds like the pap pap pap of a small exhaust leak.
     
  4. Bow512

    Bow512 Full Access Members

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    The linkage for the wastegate actuators on the turbos. Very common in these and considered “normal”. If you stick your hand in there and hold them they will be silent. It’s very annoying. Once the metal warms up they are silent.
     
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  5. Deadman

    Deadman Full Access Members

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    Mine sound just like that from day one....
     
  6. TobyU

    TobyU Full Access Members

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    So is it air leaking around the waste wastegate seal or a wastegate just wiggling sideways back and forth?
     
  7. Bow512

    Bow512 Full Access Members

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    It’s the linkage itself rattling. Nothing is leaking just not a good design for the linkage. Too much play and causes noise. Here is a screenshot from a quick google search.

    4B9C04FC-3659-4CAC-8418-CCC0E8427CE6.png
     
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  8. Jay Dubs

    Jay Dubs Active Member

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    That's what mine sounds like on a cold start too
     
  9. TobyU

    TobyU Full Access Members

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    Got it. Thanks. The only turbos I have any real experience with are Garrett's from Buick Grand Nationals.
     
  10. acf83

    acf83 Member

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    mine does it on cold start and when warm if you tap the throttle. Dealer said it was normal
     

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