2004 cobra weird noise when turning off the car

1 Bad Snake

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hey everyone
I have a question I'm not able to post a video at the moment. When I start my car my supercharger sound a little weird. But when I turn it off it sound like air is blowing back though the supercharger ? Like there is some kind of back pressure through the motor. Car is mostly stock with only 8k miles car is not beat on I barely drive it. I went to move it today to clear my garage and surprise to me with this strange noise I just drove it 3-4 days ago no problems no noise. Thank u in advance.
 

MG0h3

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I want to say mine sounds like that as well when you shut down. Sounds like some residual air going back out the intake. Air has to go somewhere.


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keith89

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Check your pcv? I had replaced my pcv with a check valve at one point to reduce blow by oil and i had this sound. sounded like air releasing. Put the pcv back on(with the check valve) and it went away. I think the pcv is supposed to meter the air as well as prevent reverse flow.
 

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