M275 part and how it works?




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
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.





