Bedelon Posted November 18 Share Posted November 18 Greetings The M57 engine in my E39 touring is producing an unusual noise, like a high-pitched metallic ringing or screaming, emanating from the vicinity of the vacuum pump, and it is rather loud. It manifests post-warm-up and varies with engine RPM. When I cease engine operation and then resume, the issue disappears; but, after driving for a while, it may reoccur, albeit not consistently. I have replaced the serpentine belt pulleys and detached the belt from the AC compressor to eliminate that possibility; it is unequivocally not a belt scream, and there is no contact or obstruction present. I replaced the oil filter, since one individual on YouTube resolved a similar problem using that method. The turbo is functioning well, and noise is present at idling. Any guidance would be welcomed, thank you. Link to comment Share on other sites More sharing options...
Bedelon Posted November 18 Author Share Posted November 18 Link to comment Share on other sites More sharing options...
Thenornpo Posted November 18 Share Posted November 18 I would start by removing the belt. It may be a tensioner. Link to comment Share on other sites More sharing options...
Bedelon Posted November 18 Author Share Posted November 18 The noise ceases at startup and only reemerges after a substantial drive; yet, I have replaced the pulleys, so I am very certain they are functioning well. The phone detected a louder noise coming from the top left of the engine, suspecting it may be related to the vacuum pump or the crankcase breather (which was changed around two years ago with a vortex type), however it is unclear how either component could produce that sound. I have a lengthy journey to the airport for the holidays next weekend, so I prefer not to be stranded on the roadside with a vehicle full of discontented faces. Link to comment Share on other sites More sharing options...
RacingNight Posted November 18 Share Posted November 18 The vacuum pump is likely the issue; although they are generally reliable, later models are known to seize. A pre-owned item is inexpensive to purchase and simple to install. Link to comment Share on other sites More sharing options...
Thenornpo Posted November 18 Share Posted November 18 Detach the pipe from the pump and see if the noise ceases without exerting pressure on the pump. Alternatively, detach the one from the servo. Link to comment Share on other sites More sharing options...
Bedelon Posted November 18 Author Share Posted November 18 The pipe was detached from the pump; there was no change in the noise, and the pump seemed to be functioning well. Observe that if the vehicle is still for around 15 minutes, the noise ceases and does not return upon revving the engine. Returns only after around 10 minutes of driving. Link to comment Share on other sites More sharing options...
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