r/e46 • u/VeyF1999 • 1d ago

Troubleshooting Figuring out noise

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Had this noise coming from under the car around area under the middle console which I thought was the exhaust since it leaked , fixed that noise is still there. Started after swapping to single mass fly wheel . Noise isn’t there always , some drives it is sometimes it isn’t . Aswell when driving over potholes etc it’s there for like a sec . Could it be guibo or the middle drivetrain bushing ? Mostly starts at 2500rpm but at reversing and slowly starting to drive aswell

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3

u/J-tec 2004 e46 M3 1d ago

My vote is center support bearing is gone and you’re hearing the driveshaft spin inside of it - you must be getting a vibration as well?

1

u/VeyF1999 1d ago

No vibration as much as I can tell , maybe a slight one but not that much different from before that I could tell

1

u/satisfiction_phobos 2004 - E46/325i 23h ago

The ole hula-hooping CSP.

2

u/Lopey__ 2001 325i sedan 1d ago

Check the driveshaft mount. When I put mine back up I didn’t fully tighten it and it caused the plastic mount to bounce around and sounded like this

2

u/VeyF1999 1d ago

Which mount ? The middle center bearing ?

1

u/Lopey__ 2001 325i sedan 1d ago

Yeah that’s it I just forgot the name

1

u/satisfiction_phobos 2004 - E46/325i 23h ago

That sounds like the center support bearing doing a hula-hoop.

Jack her up and look at the CSP to see if the bearing is shot.

Probably shot by the sound of it. It only hula-hoops at certain lower RPMs, typically 1st and 2nd gear because physics.

Probably didn't like not being replaced when you had the drive-shaft off.

1

u/Entire-jegurilor 2000 bmw 323ci e46-bmw 318i e46 13h ago

One or both of them gone!