Exhaust rattle noise

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Manufactured from end of 2011

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Kierownik
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Exhaust rattle noise

Post by Kierownik » Mon Apr 09, 2018 1:21 pm

Hi there,
I have a little problem with my F20 116d.
Basically at around 1k rpm the exhaust makes that horrible metalic rattle noise.
I've just been to my local garage and they said it's the flexi pipe that's making that noise.
Now is this something that can be replaced on it's own? Or is there something else that needs replacing.

To show you what it sounds like here's a little video I recorded a moment ago https://youtu.be/fbvZGHOJteI

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marco_polo
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Re: Exhaust rattle noise

Post by marco_polo » Mon Apr 09, 2018 3:49 pm

N47 Flexi's are known to fail, it's not a very reliable engine I'm afraid.

Just have it cut out, and a new one welded in by a local exhaust specialist.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - TMC Piggyback - M4 LCA's - aFe Dry Filter

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Kierownik
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Re: Exhaust rattle noise

Post by Kierownik » Mon Apr 16, 2018 2:56 pm

Flexi turned out to be like new and the entire exhaust looks perfectly fine. Still keeps making that sound when it gets a bit of vibrations.

Kierownik
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Re: Exhaust rattle noise

Post by Kierownik » Tue Apr 17, 2018 10:57 am

I've done some digging and I tell you something. No wonder it developed a rattling noise caused by vibrations from the engine as the only places the exhaust is actually holding to anything is two brackets near the rear box and dpf. No brackets all the way between and it's just hanging freely. Ridiculous desing from bmw.

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Kierownik
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Re: Exhaust rattle noise

Post by Kierownik » Fri Apr 27, 2018 6:57 pm

So once again here's the video with my car making this super annoying noise at 1k rpm https://youtu.be/fbvZGHOJteI

Someone suggested that this is probably the flex pipe that needs replacing.

Here's my flex pipe which to me looks like new
https://youtu.be/clbtKz4J1rs

What now? Exhaust is in good condition, all brackets are there and in good condition, exhaust has no cracks or anything all the way to the back.

How to get rid of that damn noise?
2013 F20 116d M Sport - RED - because reds are the fastest :-D Well mine isn't, stock 116d but damn she's beautiful.

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