TTMBCLS

has anybody notice the turbo sound when they start there car. my right side turbo makes a scraping/flapping noise right when i start it up. It sounds like it does not have enough oil and it scrapes or flapping. When the car is warmed up the sound goes away. I thought these were state of the art turbos? does my turbo have shaft play or something? i probably need more oil or an oil change. at 8k already. On cold starts it is a lot more noticeable then you can hear it change noise.

TTMBCLS

i think sometimes my wastegate doesnt close all the way and it makes those sounds. i try to put wd40 on where the outside of the wastegate flapper. after a week it still make the noise. my car drives fine and boost hits on the top end just fine. but when i start it up the noise comes and go.

TTMBCLS

Sound clip this morning . kind of hard to hear it in this video but its there.

https://m.youtube.com/watch?v=LPHqEv5lSA0

pgolfco

My CLS makes the exact same noise, but hot as long as yours. Mine goes away very quickly. Should I be concerned?

Acidic Reflux

I have the same sound coming from my cls on cold start ups. Hear it for about 3-4 seconds and then goes away. Got it checked at the dealership and no faults were found. I guess its normal.

pare5

Those are your chains..... take it to the dealer and have them take a look at it. Either needs just tensioers and check valve or tensioners, check valve and new chain.

TTMBCLS

Update: changed my oil and use my car everyday now. The noise is not there anymore..back then i didnt drive the car for a few days it was noticable but its gone now.

TTMBCLS

Hi acid reflux. I can hear the same noise as you. Does this happen to be only on one side? I am still guessing its lack of oil going to the turbo. Can't tell for sure.

Acidic Reflux

Bro it was exactly what pare5 mentioned. it was chain tensioners and valve problem. I got it fixed at the dealership. It seems like a common problem with M278 engines. My car is only 8000 miles driven and this problem occured. Its better to get it fixed before it stretches the chains which can cost a lot more.

TTMBCLS

The sound is not from the timing chain. This noise is coming from my turbo.