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Super bizarre noise under the hood Super bizarre noise under the hood
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Old 11-17-2021, 12:28 PM
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Super bizarre noise under the hood
As the title says I’m getting a super bizarre noise under the hood. Here’s what it sounds like. https://voca.ro/1ktQVF1Qnq0b Just Changed the CCV and all the hoses with it. My buddy thought it was IACV (I cleaned it when changing CCV) so I took it out cleaned it and the grommet along side it. It fixed the noise momentarily and now it’s back. Any ideas?
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Old 11-17-2021, 12:37 PM
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Which Engine and how does RPM affect the timing.

It seems periodic but nothing comes to mind with what cycles that slowly.

Pull the dipstick to see if release the crank vacuum changes the sound. It sounds like a failed diaphragm letting air though.
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Old 11-17-2021, 02:40 PM
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Quote:
Originally Posted by andrewwynn View Post
Which Engine and how does RPM affect the timing.

It seems periodic but nothing comes to mind with what cycles that slowly.

Pull the dipstick to see if release the crank vacuum changes the sound. It sounds like a failed diaphragm letting air though.
e53 M4 I pulled the dipstick and this is what happens https://voca.ro/11YACaErhnVR
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Old 11-17-2021, 03:18 PM
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Does the sound stay on or off you didn't have video so I'm not sure when the dipstick is closed or open.

If the sound stops while dipstick out the cause is in the CCV could be harmless a bit of moisture at a check valve or something.

I haven't had my CCV apart yet so I'm not familiar with it to say more detailed.

It sounded like I heard the honk change though so you're on to something.
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Old 11-17-2021, 04:08 PM
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The sound changes into a more guttural gurgling sound with a whirring
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Old 11-17-2021, 04:09 PM
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Does it change from pulsing to constant.


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Old 11-17-2021, 05:04 PM
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Sort of, the noise subsided temporarily after I re insterted the dip stick. When I leave it out the noise progressively gets worse. In that audio clip I sent I took the stick out, put it back in and then took it out again
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Old 11-17-2021, 08:56 PM
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That suggests a leak into the CCV or CCV generating too much vacuum. Pull the oil fill and see if it's super sucky.
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Old 11-17-2021, 10:37 PM
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Isn't the Banshee upgrade? Or maybe it was the Poltergeist Performance Package...I'm struggling to recall exactly which one brings that on....
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