[veli410]

You might have better luck in the proper forum for your car. The W203's with the M272 engines did not use this pump. I suspect the OP in this thread was talking about the oil centrifuge cover.

I have a 2007 C230 with an M272 Engine that has this vacuum pump. Its making noise, leaking oil and my brakes are hard so I will be replacing it. The centrifuge cover is on the other side, the passenger side, I replaced the centrifuge cover and hose while chasing a rough idle but didn't solve the issue, it's a subtle rough idle that comes when the car is cold. After its warmed up, the rough idle only manifests itself in sporadic intermittent single stumbles, like a single shake that feels like the car wants stall. They appear 2-3 times in a 30 minute period idling The Engine/Transmission mounts are all new so I know that's not it.

Some one in another thread said the vacuum pump replacement solved his rough idle I guess I will find out. I can't find a vacuum leak anywhere.

 

[veli410]

Did you get to change your vacuum pump? Did it fix your rough idle?

I did change the vacuum pump. No noticeable difference. I still have that random shudder/rough idle and still no codes or CEL. Brakes are still somewhat hard in my opinion but It could be because I drive an accord and a C230, The accord brakes are super soft and responsive so I may just be feeling the difference between the two.