[scotty91ss]

My rattle (with the Akrapvovic exhaust) occurs during cold start only. It only happens during the last 5 seconds of cold start when it is revving down.
My plan is to get the cold start coded out and see what happens.

[Simon H]

Originally Posted by onfireX5

Since it is the valves, does it quit rattling when the exhaust button is pushed on and the engine mode is in Sport Plus ?

Unfortunately no, i have tested this, and actually stuck some wood up the pipes when it is vibrating, and it didnt stop it. This is another reason why it could be the coupling of the actuators to the valves, and we cant see it. It could also be something inside the rear silencer itself, that we also cannot get at internally. Sure is a weird problem, that i would like to find the cause of.

[MB625]

Originally Posted by Simon H

Hi Buddy,
Could i ask where you got this info from, is it legit ?. Ive been at this problem with BMW customer services now for a while, and they have point blank refused to do anything, stating, its a characteristic of the sports exhaust, and have offered me £250 to spend on any BMW products . I mentioned fitting an aftermarket silencer, or system, only to have the old chestnut of my warranty then being void, thrown at me. Im surprised by BMW on this, as its spoiling the car for me now.

Hello Sir, certainly – from my local SA/Tech Lead. It’s as concrete and as legit as I can deduce momentarily. At least you were offered a voucher of sorts!
It really isn’t a characteristic of anything… I attempted to argue that as it’s ‘their problem’ with regard to the slow production; they should be able to produce/find a MPE. This was rebutted as it’s an upgrade; allegedly. Sharing your disgruntlement as well in all honesty.

To cover your later points as well:
- Concur with your diagnosis that it must be the last “1/3” of the exhaust. However, when the vibration is visible, vibrations on the mid-pipe are discernible as well.
- When you mentioned that your rear silencer was cut off, was that undertaken to replace the actuators?
- The exact same noise is noticeable on pre-LCI models (i.e. without the OPF); but the manner in which the vibration is transported (cf. Scotty’s mention – when the rpm decreases post the cold start/warm up phase) leads me to believe it’s definitely coming from upstream. Would almost be keener to have the ‘source’ resolved.
- Not sure how BMW have stayed in touch with you, but for every one of my ‘love letters’ they grace me with a call

@Sharky – your description of how it makes you feel, and the analogy is gold Sir.

[Simon H]

Originally Posted by MB625

Hello Sir, certainly – from my local SA/Tech Lead. It’s as concrete and as legit as I can deduce momentarily. At least you were offered a voucher of sorts!
It really isn’t a characteristic of anything… I attempted to argue that as it’s ‘their problem’ with regard to the slow production; they should be able to produce/find a MPE. This was rebutted as it’s an upgrade; allegedly. Sharing your disgruntlement as well in all honesty.

To cover your later points as well:
- Concur with your diagnosis that it must be the last “1/3” of the exhaust. However, when the vibration is visible, vibrations on the mid-pipe are discernible as well.
- When you mentioned that your rear silencer was cut off, was that undertaken to replace the actuators?
- The exact same noise is noticeable on pre-LCI models (i.e. without the OPF); but the manner in which the vibration is transported (cf. Scotty’s mention – when the rpm decreases post the cold start/warm up phase) leads me to believe it’s definitely coming from upstream. Would almost be keener to have the ‘source’ resolved.
- Not sure how BMW have stayed in touch with you, but for every one of my ‘love letters’ they grace me with a call

@Sharky – your description of how it makes you feel, and the analogy is gold Sir.

Rear silencer was cut off, to be replaced with a new silencer, but still the problem persisted. They then fitted new actuators, with no joy. I would have cracked the car up with the silencer removed, to see if i could hear, or feel, any vibration, but it was a missed opportunity.

[sharky67]

My dealer came back to me after replacing the actuator valves and now have stated it’s a characteristic of the vehicle .

BMW this is wrong … you have heard the video . If it was a normal sound they would not have attempted and changed the actuator valves . It’s definitely not normal …

This needs to be escalated .

[MB625]

Originally Posted by sharky67

My dealer came back to me after replacing the actuator valves and now have stated it’s a characteristic of the vehicle .

BMW this is wrong … you have heard the video . If it was a normal sound they would not have attempted and changed the actuator valves . It’s definitely not normal …

This needs to be escalated .

Are you, or even anyone that has commented already; receiving the confirmation of this fault in writing?

[sharky67]

I have asked today for the fault in writing today from my bmw dealer from BMW UK . Not happy they are saying it’s normal . Asked to look into this matter further . My dealer will look into this further for me as they agree it is a rattle .

The dealer had the video of the fault . This was shown to BMW UK . They recommended actuator replacements . If it was a quirk of the vehicle they would never have reccomended a fix . As they have attempted a fix it means that their is a fault with the vehicle that will require rectification

[Simon H]

Ive actually sold my car now, but there is no way on earth this is a characteristic of the sports exhaust, otherwise they would all do it. Its the first time BMW have fired me off with a problem, and i was so disappointed in them. There is more than one way to skin a cat. They should either fix the problem themselves, or let the customer fix it, with their chosen rear silencer, which is where the problem lye's, then reimburse them ?.

[sharky67]

Hi ,

Yep sold mine too . If it can’t be fixed then bye bye . I love bmw cars . You get some lemons in all brands . Has not put me off buying another BMW .

Originally Posted by Simon H

Ive actually sold my car now, but there is no way on earth this is a characteristic of the sports exhaust, otherwise they would all do it. Its the first time BMW have fired me off with a problem, and i was so disappointed in them. There is more than one way to skin a cat. They should either fix the problem themselves, or let the customer fix it, with their chosen rear silencer, which is where the problem lye's, then reimburse them ?.

[Simon H]

Originally Posted by sharky67

Hi ,

Yep sold mine too . If it can’t be fixed then bye bye . I love bmw cars . You get some lemons in all brands . Has not put me off buying another BMW .

Of course, wouldnt put me off either. Put my name down for an M3 CS when they are available .

[crypto]

Originally Posted by Maxlude

Sounds like to there's stones stuck in between the exhaust pipe and the black outer trim.
Or maybe it 'just needs to carbon up mate' lol I've been given that bs before !

Hah after I had my Remus on my M550i for maybe 1000 miles at idle one day I had this rattle / vibration. It didn't do it all the time but would randomly appear at idle after driving for a while. It was a small rock in the exhaust tip. Got it taken out by blowing air in it.

[MB625]

Hi folks, seemingly the day has arrived. The refreshed version of the MPE was installed today. Collecting the vehicle tomorrow. Took exactly 12 months to resolve.