Suspected waste gate rattle

Pooltee · Post by **Pooltee** » Thu Sep 10, 2020 6:54 pm

Good evening all

I have had a bit of a rattle on my Z from cold for a while now, but it is starting to get progressively worse.

When starting the car from cold, there is a very metallic rattle coming from around the turbo area. Makes the car sound horrible. After about 2 minutes the noise does go away mainly, but can be heard if you blip the throttle.

I can find lots of waste gate issues relating to the 6 pot, but nothing on here for the N20.

Has anybody experienced the same, and is there a fix that doesn’t include a new turbo.

Cheers, Paul

Chippie · Post by **Chippie** » Thu Sep 10, 2020 8:58 pm

could it be the timing chain rattling?

Chippie · Post by **Chippie** » Thu Sep 10, 2020 8:59 pm

could it be the timing chain rattling?

Pooltee · Post by **Pooltee** » Thu Sep 10, 2020 9:04 pm

Chippie wrote: ↑Thu Sep 10, 2020 8:59 pm could it be the timing chain rattling?

Very confident it’s not the chain. Chasing the sound down in the engine bay it is 100% coming from the turbo area.

Pbondar · Post by **Pbondar** » Thu Sep 10, 2020 9:11 pm

The timing chain generally is more of a whine rather than rattle..

https://bmwtechnician.com/2016/08/07/n2 ... ain-issue/

Pooltee · Post by **Pooltee** » Fri Sep 11, 2020 9:14 am

This is very much a rattle. Best way I can explain it is like keys rattling against a can. Only really noticeable for the first couple of minutes on cold start, or if you give the engine a sharp rev when warmed up.

Listening around the timing chain area there are no unwanted noises at all.

Pbondar · Post by **Pbondar** » Fri Sep 11, 2020 9:25 am

In the US they issued an emergency service bulletin for this ..

Some comments here about it..

https://f30.bimmerpost.com/forums/showt ... ?t=1394012

https://f30.bimmerpost.com/forums/showt ... ?t=1635210

Service bulletin. https://static.nhtsa.gov/odi/tsbs/2018/ ... 8-9999.pdf

Pooltee · Post by **Pooltee** » Fri Sep 11, 2020 12:19 pm

Interesting reading. The video in the second link you posted is exactly how my car sounds on cold start ( bloody awful), so it looks like I will be having the turbo off soon and see if the modified part sorts the issue.

Always something isn’t there!

enuff_zed · Post by **enuff_zed** » Fri Sep 11, 2020 1:04 pm

Pooltee wrote: ↑Fri Sep 11, 2020 12:19 pm Interesting reading. The video in the second link you posted is exactly how my car sounds on cold start ( bloody awful), so it looks like I will be having the turbo off soon and see if the modified part sorts the issue.

Always something isn’t there!

You may want to temporarily change your signature too.

I'm sure someone had a rant about it a while back and you don't want to give out ammunition.

Pooltee · Post by **Pooltee** » Fri Sep 11, 2020 2:55 pm

enuff_zed wrote: ↑Fri Sep 11, 2020 1:04 pm
Pooltee wrote: ↑Fri Sep 11, 2020 12:19 pm Interesting reading. The video in the second link you posted is exactly how my car sounds on cold start ( bloody awful), so it looks like I will be having the turbo off soon and see if the modified part sorts the issue.

Always something isn’t there!
You may want to temporarily change your signature too.
I'm sure someone had a rant about it a while back and you don't want to give out ammunition.

Noted, and updated

enuff_zed · Post by **enuff_zed** » Fri Sep 11, 2020 3:49 pm

Pooltee wrote: ↑Fri Sep 11, 2020 2:55 pm
enuff_zed wrote: ↑Fri Sep 11, 2020 1:04 pm
Pooltee wrote: ↑Fri Sep 11, 2020 12:19 pm Interesting reading. The video in the second link you posted is exactly how my car sounds on cold start ( bloody awful), so it looks like I will be having the turbo off soon and see if the modified part sorts the issue.

Always something isn’t there!
You may want to temporarily change your signature too.
I'm sure someone had a rant about it a while back and you don't want to give out ammunition.
Noted, and updated

Z4-forum.com

Z4-forum.com