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      02-28-2018, 07:52 AM   #1
2quik
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Annoying rattle at start up

During my quest to purchase a 2015 X1 xdrive 28i, I noticed that everyone I started had a rattle on start up that disappeared. It sounded like a heatshield or catalytic cover rattling. The car I purchased also does it and I am wondering is this unique to all the 2015's?
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      02-28-2018, 08:11 AM   #2
kiloTHREE
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It's the linkage for the wastegate.
Number 2 in the picture.
All of the 28i's do it till it warms up, some worse than others.
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      02-28-2018, 08:41 AM   #3
2quik
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Thanks for your quick reply and feedback.
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      02-28-2018, 09:25 AM   #4
interceptor428
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Check your muffler..the exhaust flag mechanism can cause a rattle too. I "cheated" this by zip tying the vacuum line to the flapper mechanism..no more rattle. Stick your head out the door while starting and see if the rattle comes from the rear or under the engine
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      03-19-2018, 10:25 AM   #5
SharpAndCunning
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Quote:
Originally Posted by 2quik View Post
During my quest to purchase a 2015 X1 xdrive 28i, I noticed that everyone I started had a rattle on start up that disappeared. It sounded like a heatshield or catalytic cover rattling. The car I purchased also does it and I am wondering is this unique to all the 2015's?
my 2014 x1 35i does this. It seem to go away after the car has been running for a couple of minutes. MY local dealer told me it was wastegate rattle and many many cars do it. It's annoying.

One of the many reasons I'm starting to think this car was a bad idea.
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      03-19-2018, 10:44 AM   #6
kiloTHREE
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Just a heads up, I may have found a permanent and cheap fix.
I'll let ya'll know after I test it for a month.
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      03-19-2018, 10:16 PM   #7
SharpAndCunning
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Quote:
Originally Posted by kiloTHREE View Post
Just a heads up, I may have found a permanent and cheap fix.
I'll let ya'll know after I test it for a month.
Test it for a month? Can you give us some more infomation. What do you think causes the rattle?
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      03-20-2018, 06:29 AM   #8
2quik
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@interceptor428

The rattle, as you mentioned, is definitely coming from my exhaust. Can you please be more specific as to what the exhaust flap mechanism is and where is the vacuum line that I should zip tie.
Thanks in advance

Last edited by 2quik; 03-20-2018 at 06:37 AM..
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      03-20-2018, 08:45 AM   #9
kiloTHREE
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Quote:
Originally Posted by jpc647 View Post
Test it for a month? Can you give us some more infomation. What do you think causes the rattle?
Already posted one of the common rattles above. So far my fix is working but they usually don't last. So far so good on mine.

Quote:
Originally Posted by 2quik View Post
The rattle, as you mentioned, is definitely coming from my exhaust. Can you please be more specific as to what the exhaust flap mechanism is and where is the vacuum line that I should zip tie.
Thanks in advance
That actuator just to the bottom left of #8 in the picture.
Google "golf tee mod"
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      03-20-2018, 11:14 AM   #10
interceptor428
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Quote:
Originally Posted by 2quik View Post
@interceptor428

The rattle, as you mentioned, is definitely coming from my exhaust. Can you please be more specific as to what the exhaust flap mechanism is and where is the vacuum line that I should zip tie.
Thanks in advance
If you look on the driver side of the trunk area, there is a tray..pull-up on that tray and you will see a valve with vacuum lines. Once you see it you will understand what to do.
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      03-22-2018, 11:48 AM   #11
SharpAndCunning
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Quote:
Originally Posted by interceptor428 View Post
If you look on the driver side of the trunk area, there is a tray..pull-up on that tray and you will see a valve with vacuum lines. Once you see it you will understand what to do.
This only fixes the rattle if it's from the exhaust flap. If the rattle is coming from the front of the car, and is indeed the wastegate linkage, we need to know what KILOTHREE's fix is.

I'm super upset that BMW can't figure this out. 2 dealers, and both say it's normal. This car was 50k new, and it's still under warranty, I shouldn't have a rattle that sounds like nails in a tin can when I start it up.
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      03-22-2018, 03:16 PM   #12
kiloTHREE
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Quote:
Originally Posted by jpc647 View Post
we need to know what KILOTHREE's fix is.
Don't get excited, I've "fixed" this three times before... heat mitigation for my solutions seem to be the problem.

So far I've tried:
High temp silicon - failed
aluminum spacers - failed
silicon mat - failed

Now I'm on to a carbon/graphite felt washer...
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      03-23-2018, 03:35 PM   #13
SharpAndCunning
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Quote:
Originally Posted by kiloTHREE View Post
Don't get excited, I've "fixed" this three times before... heat mitigation for my solutions seem to be the problem.

So far I've tried:
High temp silicon - failed
aluminum spacers - failed
silicon mat - failed

Now I'm on to a carbon/graphite felt washer...

Interesting. What about those puck's you can put to seal exhaust leaks. They are similar to what you're talking about, but solid. You can make waskers out of them with a hole saw. Where are you putting these solutions. What is actually rattling. The linkage?
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      04-02-2018, 07:36 AM   #14
SharpAndCunning
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KiloThree,

Just checking in. Waiting for a write up or explanation. I started my car in front of a client today, and he asked me if my car was "okay".



He's from the parent company in Germany, and BMW's over there "don't rattle".
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