S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

M275 part and how it works?

Old Mar 9, 2025 | 08:58 PM
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S-600 w220, Nissan s13 coupe, and Nissan s13 convertible
M275 part and how it works?

Does anyone know the name and part number for the box that distributes the vacuum? It sits under the intake manifold. How does the box get vacuum? My engine has a sound like a vacuum leak underneath the throttle body. I suspect it's a vacuum leak but the car idles just fine. Could it be this box that is leaking? The leaking sound is pretty loud. Where else could that noise be coming from?
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Old Mar 10, 2025 | 01:37 PM
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Any codes?

There are a number of vacuum lines / connections. I'd recommend smoke testing to try and locate it or at least narrow things down.

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Old Mar 10, 2025 | 04:04 PM
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Hello, send me your VIN number via private message, I can check it in EPC catalog.
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Old Mar 10, 2025 | 07:35 PM
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I changed out all the vacuum lines and the only place I can't get to without disassembling stuff is under the intake manifold.

If I did have a vacuum leak shouldnt the car idle fluctuate? The car idles at 600rpm perfectly. There is a loud hissing sound that comes from roughly the left sidd underneath the throttle body. I dont know if this is normal since i dont have another m275 to compare it with. Removing the intake manifold doesn't seem like a small job. From what I can tell, injectors and a bunch of other stuff need to be removed first so I'm a little hesitant
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Old Mar 11, 2025 | 12:27 PM
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Vacuum issues can be tricky. I've worked on and driven a number of M275-powered cars and a loud hissing is not normal.

Was the hissing sound present before you replaced the vacuum lines?

The benefit of the smoke test is to detect leaks without having to remove much.

Also, it may not be a vacuum line at all. Could be something as a simple as a loose hose connection / clamp.

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