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@1004ronThis problem isn't limited to 2015 and up. My 2011 had the same fluttering air shields because the pins were loose and rattling in their holes. On inspection, the fender well pins exhibited the same behavior. So when an Amazon package arrived for me with hi-density-poly foam panels, I sliced off 1/4" pieces and made 1"x1" square washers. I popped each of the plastic rivets with one of the body tools that removes them, put the newly minted washers on them and popped them back in.  Luckily it was black foam. No more noises! It took me only 2 years to find where the noise was coming from-LOL.

 

It's apparent that the new fastening system will not lend itself to my fix, but you might think about winding hi-density foam strips around the string (like a twist tie) before winding the string around the new fastener. It will probably last longer. The foam is pretty robust and stiff. Mine's been fine for nearly 2 years now.

 

Good luck!

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@bb56  I can envisage those washers working, and I have some of that foam you described and will give that I try.

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I gave another method a shot after mine started vibrating again. I waited a few weeks before posting so I could test that they have been working for me. Basically I used strips of duct tape to fashion my own washer between the gap. Once I got a good amount of tension I placed a zip tie around the duct tape to keep it secure. It might not be the prettiest or the most proper job, I'm sure foam is a better bet. For me though, this worked great. I figured I would post it for anyone just wanting to try a free fix, I am sure just about everyone has these supplies on hand. 

IMG_0701.jpeg

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Besides being a poor design, even after you replace them the problem will come back after an oil change.

After my first oil change this rattle started, went back to the dealer and asked if all the grommets were put back. I was told one was broke and they fixed it, drove the car home same noise... I hate rattles. I bought the 6 pack and replaced the worst one - hard to do on the floor in the garage.  Time for a test drive ;)

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Has nothing to do with an oil change?  Those long underbody panels are not touched.

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Hi All,

 

I know I am responding to a quite old thread. But I had a few questions.

 

So as per the post, I applied some similar fixes. But after some talks and especially Reddit, some people suggested to simply just take it off which I am not quite in favor of.

 

The other is people simply removed the clips just resting the guard on the 10mm nuts, which I think might work but then I am concerned if that will have adverse, especially when driving at highway speeds.

 

Can anyone give their opinions?

 

Thanks!

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I wouldn't take the covers off - it offers protection to things like the brake and fuel lines.

 

I applied the foam washers and new fasteners as per the Tech Bulletin and as I commented in this thread it didn't silence it for long.

 

I recently used zip ties and the buckle of the ties keeps the plastic posts cocked to one side and I believe that's going to keep quiet for longer.

 

 

 

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Hi All,

 

Firstly, I am new to these forums so apologize if I made any mistakes posting this.

 

So, talking about the concern I have is. I have a highway rattle that occurs due to splash guard or underbody shields that are on both sides of the driver and passenger. I did fix it temporarily applying the idea from the post as mentioned.

https://www.fordedgeforum.com/topic/24176-solved-noise-or-rattle-above-40mph/

 

However, I am looking for a permanent fix. After some talks and Reddit, people suggested taking those splash guards off but I am not sure if I should do it since it kinda protects the metal frame.

 

But few suggest to take the clips off and leave if rested there by 10mm nuts which I think can work but can anyone suggest if it would be a good idea and if it will not harm anyway in the later run or saying driving at highway speeds.

 

Thanks!

Edited by 1004ron
Keep it to one thread - same topic

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Is it just me or is the under carriage  cover a pain and noisy? What is the purpose of it and has anyone removed it because they are tierd of hearing it rattle 

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My guess is they're there to create a more streamlined airflow to improve aerodynamics. Others in a BMW forum argue it protects the engine bay from road debris. 

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@1004ron

 

Thank you for the idea and I did try your fix but eventually, it has returned again. However, it generally happens when driving around 80mph but the thing is if I paid for a costly car I don't expect it to rattle due to such a bad design.

 

What would be your advice if I remove the center plastic clips and let them hang on the 10mm retainers?

 

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 if I got back into it I'd remove the covers, re-install the plastic parts/posts with sealant on the part that clips into the bodywork, and then use a high density foam rubber on the attachment of the cover to the plastic posts.

Edited by 1004ron

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@1004ron

 

Thank you for the idea!!

Correct me on mine, I was thinking of removing the plastic clips and using the self-tapping screw to tighten them up against the body? I feel that would be a more permanent solution

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I found the attached updated TSB 21-2322 issued 23-September-2021 (superseding 17-0065) stating to just remove & discard the fasteners. Calling them "assembly aid fasteners".

MC-10201635-0001 - TSB 21-2322.pdf

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Thanks @omar302

 

Its odd that they now label them as "assembly aid fasteners" after previously making kits available with gaskets.

 

I'm keen to see how it goes with those that remove these fasteners leaving large holes, and possibly droop in the middle of the shield.

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@bhamraS97

I'm not keen on using self-tapping screws - not sure if the screws would go through the floor pan, and the risk of corrosion where it damages the metal coatings.

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Thank you @omar302 and @1004ron for all the input. Much appreciated!

 

I did come across someone on youtube comments who removed the fasteners. I tried reaching out for his feedback about how well that worked out but he didn't respond

Edited by bhamraS97

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On 12/10/2020 at 4:04 PM, todd92 said:

Has nothing to do with an oil change?  Those long underbody panels are not touched.

True but when the front section of these under body splash guards aren't put back on right or the mechanic that did the oil change cut away some of the splash guard and didn't put all of the fasteners back on correctly then air gets up under the long panels and causes the grommets to come loose and the flapping begins. It has happened to me twice already. I'm thinking about removing them all has anyone else done that?

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14 hours ago, Colby said:

True but when the front section of these under body splash guards aren't put back on right or the mechanic that did the oil change cut away some of the splash guard and didn't put all of the fasteners back on correctly then air gets up under the long panels and causes the grommets to come loose and the flapping begins. It has happened to me twice already. I'm thinking about removing them all has anyone else done that?

I took off the front splash guard because it was driving me crazy plus there is no way of attaching the back part of it because the oil change place cut it out to make it easier to change the oil I assume.

20220620_185803~2.jpg

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It's not a 'splash' guard.  It's for aerodynamics and NVH.

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