Quote:
Originally Posted by MSH_
Same. Took mine in a couple weeks ago and they said "all sounds normal" I bought my '20 M2C from a Services Tech Lead at a BMW dealership in FL and he told me.... "The direct injectors and the 2 fuel pumps are a bit noisy. We get a lot of concerns with them but it's just how it is" The local dealer here in CO also says all normal so I'm just going with it. Warranty ends in August and then its time for a mild tune with Enabled
Here's mine.... https://www.youtube.com/shorts/UwWLDIEQMgQ |
That sounds completely normal to me too, be happy! Nice regular injector tick, just like any other DI petrol engine. That's how mine sounds now it's had the fix applied.
The loose cam tap / knock in previous videos is a totally different sound in additon to the injector tick. Any decent mechanic would spot the cam knock straight away.
All the parts involved (except the bare head itself) are not S55 specific, the same bearing ledges, fixing bolts, dowels, cam adjusters, lifters, chain etc etc have been around for
17 years on N52, N53, N54, N55 & S55.
Fuel injectors and even the cams themselves are the same on N55 and S55 so 14 years old, nothing unique there for S55.
This issue must be down to an S55 assembly problem that manifests itself on some not others either due to component tolerances or the variability of the incorrect tightening. I've not heard this issue for the other engines above.