If you detect a noise on your automobile, you are right to be aware of it and take it seriously, although it is conceivable that nothing major will occur, it is also conceivable that it is the symptom of a more significant restoration. A noise that appears in the trunk of your BMW 4 Series is fortunately more a signal of a small correction or service, rather than a complicated one. To help you in your research, we have decided to produce this content to present you with the most likely solutions to your issue. First we will see that this trunk noise on your BMW 4 Series can come from built up dirt, the issue can also come from a loose lock and finally, it can even come from a simple rivet that sits inside your bumper.
Noise in the trunk BMW 4 Series : Accumulated dirt that triggers poor closing
We will therefore start with a trunk noise on your BMW 4 Series triggered by dirt accumulated on your joints, lock for example. Indeed, it is conceivable that on a automobile that is already a few years old and whose cleaning is not always a main concern or that the roads used are not very clean that dirt builds up at the trunk gasket. This issue triggers a poor closure of the trunk and a noise that can sound like a crack. To verify if you are in this scenario, open the trunk of your BMW 4 Series, check the condition of the gasket that goes around the entire tailgate and clean it with a wet/soap cloth, dry the whole thing and try to close the trunk and take a dentred road to see the improvement. If this is not the case, continue to the other hypotheses that will probably give a solution. It is conceivable however that you have a trunk noise on your BMW 4 Series that is related to other sources such as shock absorbers, do not hesitate to read this content on the noises at the back of a BMW 4 Series.
Noise in the trunk of my BMW 4 Series : Loose lock, clicking noise
Second possibility, you may also, over time, knowledge a locking system that has taken up some play. And this is one of the most potential alternatives. Indeed, knowing a trunk noise on your BMW 4 Series is very frequently related to this issue. Different solutions are existing to you subject to the level of play you have with your lock. The first is that oftentimes the offset is minimal and a simple greasing of the system with thick grease is more than enough to fix the problem. Secondly, it is also conceivable that you really have a lot of play on your lock and that each time the trunk “jumps”, in which circumstance you would have to remove the cover that enables access to the lock (inside the trunk). Then, using torx screws, you unscrew the striker attached to the threshold, simply push it back a little towards the inside of the trunk and tighten it again. You should verify the centering of the striker in relation to the trunk lock. If after verifying the trunk of your BMW 4 Series closes badly, it means that you have moved it too far, replicate the procedure by pushing the striker less.
Noise in my trunk BMW 4 Series : Rivet following plate swap in the trunk/ bumper
Finally, one of the last possibilities. It is that following a license plate swap you were unfortunate and that a piece of rivet fell backside your plate. Indeed, when a plate replacement is made, to remove the old one the technique used is to drill the existing rivets to be able to put out the license plate. Sadly, it can happen that part of the rivet falls into the hole of the bumper and it will therefore wander inside the bumper and can induce an annoying noise. To check that it is this problem you are experiencing, and that you have a trunk noise on your BMW 4 Series linked to a rivet, you will need to verify that it is in the tailgate open it and stir it to identify the noise. If this is your case, you will have to remove the linings from the trunk to remove it. Finally, if it is your bumper, it is in this rarer and more unpleasant case, you will have to remove the bumper to remove the bits of rivet that are running around.