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  1. #1
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    Default HELP- Name That Engine Noise

    2015 Z51. Engine started making this hissing noise after a year and a half & 11k miles. When I take off or blip the throttle I get this. Dealer said it was normal because the engine breathes a lot of air and the noise was always there but I just didn't notice it. BS I told them none of my friends cars made this noise and they said impossible. Anyone identify the problem. In this short video I just biped the throttle to give you all a idea. Many thanks. Mike


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    Mine does not sneeze like that??? There is something wrong...
    Hecox

  3. #3
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    Quote Originally Posted by jhecox View Post
    Mine does not sneeze like that??? There is something wrong...

    Sneeze--That's a great way to describe it and funny to. Thanks

  4. #4
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    No, it should not surge at idle like that. It sounded to me like a metal to metal grind type noise on my computer. Did the dealer check for any codes?

    Is the vehicle bone stock, or are there any aftermarket components. Remote start or alarm?
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  5. #5
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    Quote Originally Posted by LLC5 View Post
    No, it should not surge at idle like that. It sounded to me like a metal to metal grind type noise on my computer. Did the dealer check for any codes?

    Is the vehicle bone stock, or are there any aftermarket components. Remote start or alarm?
    Bone stock except for a mild to wild setup. I remover the mild to wild set up and still got the same sound. No check engine light on. I don't even think the dealer checked the stored codes. I know about 30 guys with C7s and I am the only one with that sound. Possibly the posters that say that is normal have the same problem. I did have friends say it sounded like a metal sound. Possibly a pulley. To me it sounds like a intake-vacuum sound.

  6. #6
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    That sound is made by turbulence of air flow around the throttle blade just as you crack it open. I've heard that noise on other engines, but not too many 3G LT1s.

    Admittedly, yours is pretty loud.

    Are there any air leaks in the intake system? Check to make sure any/all hoses are connected and the air box is properly sealed.

  7. #7
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    Quote Originally Posted by Hib Halverson View Post
    That sound is made by turbulence of air flow around the throttle blade just as you crack it open. I've heard that noise on other engines, but not too many 3G LT1s.

    Admittedly, yours is pretty loud.

    Are there any air leaks in the intake system? Check to make sure any/all hoses are connected and the air box is properly sealed.

    Will crawl into the engine bay this weekend. Thanks
    Last edited by B/STOCK; 09-14-17 at 12:51 PM.

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