Hello,
I have a '99 323i with ~50k miles that has an intermittent engine noise. I initially thought it was a pulley, but based on the location the noise seems to be coming from, I'm now not so sure. I took a video with my phone that shows the noise pretty clearly. Please keep in mind though, that the pitch is variable, and, like I said, It's intermittent.
Any advise would be hugely appreciated. I cannot find a similar noise anywhere on the net.
Link:
https://www.youtube.com/watch?v=Y9XYfAq0jCA
Thanks
Use a piece of hose put it to your ear use the other end to probe around, maybe it's the disa valve that rectangle box bolted on the the end, middle of the intake manifold and when is making the noise pull the oil dip stick out slightly if the noise disappears it's a vacuum leak in the intake maniold
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