07-03-2020, 10:51 PM | #1 |
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Vibrating noise from the rear while accelerating hard
Hey guys. I just got a 2018 M4. I have noticed a buzzing noise/squeak coming from the rear when I do hard acceleration in gear 4th/5th with above 3000 RPMs (windows up). It seems like some trim component vibrates or rubs/flaps against some thing. It stays for just 1-2 seconds and then disappear if I continue to accelerate the speed. It typically starts at around 75-80 mph and disappears the moment speed goes above 90-100mph (after my continued acceleration). It is not present when I am cruising at 60-70 mph with under 3K RPM. It starts only when I push the gas pedal hard (more than half) at a speed of 60 mph in 4th-5th gear. So I think it has something to do with the air and acceleration of the car.
I don't appreciate it if loud music is on. But it is definitely annoying with music turned off. I am not sure if buzzing squeaks like this are normal at high speeds with hard acceleration or is there something wrong!! Reading the posts on the forum, there are so many people complaining about rattles/squeaks. What do you guys think is the issue here? I will eventually get it checked by the dealership in my next service visit. Car is still under warranty. Last edited by masab321; 07-07-2020 at 05:02 PM.. |
07-04-2020, 06:43 AM | #3 |
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Prob something small as long as you're under warranty and it's not annoying if the dealer makes up some excuse saying it's normal just drive it lol who cares if something breaks it's on their dime.
If your exhaust isn't stock or you listen to music always like myself I don't think you'll ever hear it. If it gets louder than maybe it'll be a big deal. Once you approach end of warranty though I'd definitely bother the shit out of your dealer before it ends. |
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07-04-2020, 07:22 AM | #4 |
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Thanks for the input. Do you guys think it has something to do with the door seals or the CF roof. I went into the back seats and pushed the area of roof around the 3rd brake light with my thumbs and it squeaks when i push with thumbs.
But as the car is under warranty... I will just get it checked if it keeps on annoying me !! |
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07-04-2020, 07:24 AM | #5 |
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Are you doing anything for it? I never thought about exhaust resonance. Which exhaust do you have? I am completely stock with ZCP exhaust.
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07-04-2020, 07:51 AM | #7 |
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07-04-2020, 08:45 AM | #9 |
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I love the car and the drive. And actually not even bothered about the comfort given the fact that am coming from a super comfy 530i. The car has different personalities depending on how you wanna drive it. I like the ride and the road noise is expected in an M car. It’s just this resonating/vibrating noise on hard acceleration that’s annoying me and I want to make sure that nothing is wrong.
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07-04-2020, 09:48 AM | #10 | |
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07-04-2020, 11:56 AM | #11 | |
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07-05-2020, 10:01 PM | #12 |
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You can hear the rattle at 0:11-0:13 secs. Just lasts for 2 secs and disappear as I rev up further. I do not notice it if my windows are down or if am playing loud music. I am not in a hurry to get it checked. Will bring it up at the next service appointment. Just wanted to post the video to see if you guys have any suggestions for a possible fix. Thanks. |
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07-05-2020, 10:13 PM | #13 | |
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07-06-2020, 12:40 AM | #14 | |
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07-06-2020, 11:24 AM | #15 |
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07-06-2020, 01:14 PM | #16 |
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Haven't done anything myself, but have had rear passengers tell me it is causing a bit of a rattle.
Maybe this thread can help you - https://f80.bimmerpost.com/forums/sh....php?t=1241733 |
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07-06-2020, 03:24 PM | #17 |
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I can't tell from video where sound is coming from (inside cabin? Below car?) but it may be exhaust buzzing up against heat shield or a hanger off or bent?
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07-07-2020, 05:01 PM | #18 | |
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It’s so disappointing that we have to deal with such issues in a car like M4. I drove the car after removing the third brake light cover and the vibration still persists. Now I am suspecting it might be something wrong with the exhaust or driveshaft (loose exhaust, exhaust hitting the heat shield etc). I am going to get it checked by my dealership on Friday. I will be able to demonstrate this to them easily. I hope they find the issue and fix it. Will keep you guys posted. |
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07-07-2020, 05:59 PM | #19 | ||
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07-07-2020, 06:47 PM | #20 | |
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Had the same situation on previous Bmw and new PS4s cured everything. |
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07-07-2020, 07:10 PM | #21 | ||
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07-07-2020, 07:11 PM | #22 | |
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