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brents

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  • Name
    Brent
  • Location
    Minnesota
  • Gender
    Male
  • Drives
    2019 Sierra AT4

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  1. brents
    You can try and keep the exhaust flapper open temporarily and see if that was it. Mine made noise as well. I'm on my phone so not an easy way to find/link the thread but there is one in how to hold the valve open. Basically just turn it from the outside (square piece) and use a nail or zip tie or something to hold it there.
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