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ID this noise ID this noise
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  #1  
Old 12-23-2025, 08:56 PM
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ID this noise
Happens at engine shut-off. Sounds like a kitten sneeze... been happening since I bought this thing. Tried to post a video of it but icloud is not cooperating... M54.
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Old 12-23-2025, 09:38 PM
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It's likely the vacuum in the crankcase being leaked back through the CCV. Or remaining manifold vacuum leaking by the throttle. Or combination.
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Old 12-24-2025, 07:57 AM
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Post the video on YouTube shorts. Interesting.
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Old 12-24-2025, 02:06 PM
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Duh, forgot about utube... https://youtube.com/shorts/S1advYqhKkw?feature=share

Should be available shortly.
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  #5  
Old 12-24-2025, 03:26 PM
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Wow, that's loud. Do you have a mechanic stethoscope? Brake booster, vacuum reservoir, or oil separator valve. Remove the oil cap at idle. Does it have a large vacuum suction on it?
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Old 12-24-2025, 07:47 PM
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I have that too but only after it’s warmed up, I think. Interesting
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  #7  
Old 12-25-2025, 02:53 AM
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Quote:
Originally Posted by X5chemist View Post
Wow, that's loud. Do you have a mechanic stethoscope? Brake booster, vacuum reservoir, or oil separator valve. Remove the oil cap at idle. Does it have a large vacuum suction on it?
I'll check that, thanks.
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Old 12-27-2025, 05:48 PM
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Quote:
Originally Posted by X5chemist View Post
Wow, that's loud. Do you have a mechanic stethoscope? Brake booster, vacuum reservoir, or oil separator valve. Remove the oil cap at idle. Does it have a large vacuum suction on it?
Yep, definitely some strong suction. Is that normal? It's an M54.
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  #9  
Old 12-27-2025, 08:15 PM
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Is vacuum is this bad? Excess vacuum is symptom of a bad CCV valve. Has yours ever been replaced? Is it using excess oil?
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  #10  
Old 12-28-2025, 12:54 PM
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Mine used to make that noise every time I shut down. It hasn't happened since I did the CCV delete.
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