1998 BMW 740iL Q&A

1998 BMW 740iL Question: Whining noise in engine.

Can take oil cap off while running and noise stops, could this be a pcv valve. Have checked idlers and all belts. -
Answer 1
It appears to be a pressure issue inside the crankcase. Check for vacuum leaks and if it has a pcv valve, replace it. -
Answer 2
I have the same problem , weird., i dont know why? remove the dip stick and the whinning , spaceship sound will end...replace it, whining sound is even loader. Help us , who really need.. -
Comment 1
I finally took it in and they replaced the intake gaskets and the noise and running rough stopped. Been running great since. -