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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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  #3  
Old 12-24-2025, 07:57 AM
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Post the video on YouTube shorts. Interesting.
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  #4  
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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  #6  
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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  #7  
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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  #8  
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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  #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, 09:34 PM
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Quote:
Originally Posted by X5chemist View Post
Is vacuum is this bad? Excess vacuum is symptom of a bad CCV valve. Has yours ever been replaced? Is it using excess oil?
Not quite THAT bad, but pretty uhh sucky.

The only thing in the prior owner's records is "pilot mod to CCV" whatever that means.

Does not use oil, no change on stick after about 750mi since the last change.

What is this CCV delete thing?
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