[Haneef]

Originally Posted by MPR

I wouldn’t consider my noise as a thump, it kinda sounds like a wooden ball in a cardboard box gently slapping the side of the box on occasion, if that makes sense. I can live with it. I guess you can consider it as a thump, but not a bad thump, just an annoyance on an almost brand new car.

Yes sir. This is exactly what I mean by thump. Yes. Yeah I am ok with it. I do have my brand new coming. I most likely might not trade my current for it. I just couldn’t wait so I got a used, 2023 6k miles (reposessed vehicle off auction). Amazing price. That dude must have loved the car as he had replaced the wheels, and added a ton of cool stuff. I am lucky!

[Pentland]

Originally Posted by MPR

I wouldn’t consider my noise as a thump, it kinda sounds like a wooden ball in a cardboard box gently slapping the side of the box on occasion, if that makes sense. I can live with it. I guess you can consider it as a thump, but not a bad thump, just an annoyance on an almost brand new car.

Could that just be the rear seat belts reel?

[Haneef]

Came across this article. FWIW lol.

https://www.impalaforums.com/threads...-rear.1456161/

[kwikit356]

Originally Posted by Haneef

Came across this article. FWIW lol.

https://www.impalaforums.com/threads...-rear.1456161/

If you think car gearheads are nuts you should take a look at the lawn and garden "tractor people."

However, I do have to admit that even though I am pretty deaf I use earplugs on any long "windows and top up" drive in my '16 Porsche Spyder. Otherwise, the road noise from the rear wheel wells drives me crazy.

[BoilerM]

I am taking my ‘22 to the dealer tomorrow (for second time) to try and have this issue diagnosed and resolved. I couldn’t reproduce the sound consistently in August during a ride-along with the tech, so hoping now that it’s freezing in Chicago it will be easier to reproduce on demand. I am going to leave the car with them for a couple days.

[TJZ67201]

Originally Posted by BoilerM

I am taking my ‘22 to the dealer tomorrow (for second time) to try and have this issue diagnosed and resolved. I couldn’t reproduce the sound consistently in August during a ride-along with the tech, so hoping now that it’s freezing in Chicago it will be easier to reproduce on demand. I am going to leave the car with them for a couple days.

Please keep us up to date. They may want to open a case with BMWNA for additional investigation. It’s definitely more noticeable in the colder weather. My garage is heated so it’s not noticeable when first driving off, but can hear it more once the metal gets cold from being outside

[BoilerM]

Originally Posted by TJZ67201

Please keep us up to date. They may want to open a case with BMWNA for additional investigation. It’s definitely more noticeable in the colder weather. My garage is heated so it’s not noticeable when first driving off, but can hear it more once the metal gets cold from being outside

They are still working on it. Two techs (including the foreman) heard the rattle, on two separate days, so that’s good. Their first attempt involved repositioning my aftermarket exhaust tips as they suspected it was bouncing around and making contact with the diffuser, but alas it wasn’t that. Their next attempt will involve inspecting the headliner where it meets the rear window. Give them credit for trying to address it. More to come.

In the meantime they’ve loaned me an m440i convertible. The oem exhaust sounds much better than my M240 but overall the driving experience is underwhelming. The mild hybrid is “ack.” My 5 yos are loving it though. Been driving around Chicago with the top down in 30 degree weather. #dadoftheyear

[Haneef]

Guys for some reason, I felt like it could be the fuel cap? I mean not the cap inside, the panel? Thinking of trying to tape it shut for a bit and try. It does move a bit and I assume when car goes over bumps it could make a sound. It’s also on the passenger side rear where the sound comes from?

[Wasp_Factory]

I've been getting the noise you're all talking about, but the strange things is that mine is a UK car and my noise is coming from the passenger side - ie the opposite side to where you are all hearing it. Wonder if this is a clue??

[Haneef]

Originally Posted by Wasp_Factory

I've been getting the noise you're all talking about, but the strange things is that mine is a UK car and my noise is coming from the passenger side - ie the opposite side to where you are all hearing it. Wonder if this is a clue??

Is your fuel cap on the passenger side?

[Wasp_Factory]

Driver's side. I can't see it being the fuel cap door in my case. Sounds like a hard ball bouncing around in a plywood box.

[BoilerM]

Update time: SA contacted me and indicated the foreman and tech inspected the headliner, rear seats, and entire rear suspension without any success in identifying the source of the rattle. They’ve spent 7 hours in total over the last week. They may turn their attention to the bump stops now. This may wind up being a gremlin I need to live with as I want to limit the potential of introducing new rattles with all the removal and reattachment of panels. I give them credit for doing as much as they have thus far. More to come.

[TJZ67201]

Originally Posted by BoilerM

Update time: SA contacted me and indicated the foreman and tech inspected the headliner, rear seats, and entire rear suspension without any success in identifying the source of the rattle. They’ve spent 7 hours in total over the last week. They may turn their attention to the bump stops now. This may wind up being a gremlin I need to live with as I want to limit the potential of introducing new rattles with all the removal and reattachment of panels. I give them credit for doing as much as they have thus far. More to come.

Thanks for the update. Will patiently wait for your next update.

For those of us currently living with the noise, I found that if you code Comfort+ mode with BimmerCode, the noise is SIGNIFICANTLY reduced. So this has to be an issue with the shock absorbers no? I only hear the noise over very slight imperfections in the road, sounds like the noise comes when the shocks back out to full extension (rebound) but I could be wrong

[Wasp_Factory]

Could be the shocks, but could be something else that is loose that just rattles more when the shocks are set harder and the rebound rates are higher.

[BoilerM]

Finally got the car back today after a week with the techs. They brought in a second shop foreman and confirmed that the sound was there but still couldn’t isolate it. I think this is just something I’m going to have to live with until BMW figures this out and issues a TSB. Per the repair order they re-torqued all exhaust hanger bolts and rear suspension bolts, removed and re-installed the headliner, removed and re-installed the rear seats, and dismantled the trunk. Kudos to the dealership for trying, but no dice, and I don’t want push it further at risk or introducing new issues and burning what is. at the moment, a great relationship with the SA. Hopefully someone has luck with this!

[Haneef]

Check this out, weird that even the M340i has it

https://www.reddit.com/r/BmwTech/com...lunking_sound/

Also see this image - https://ibb.co/LtqmxZ4

[TJZ67201]

Originally Posted by Haneef

https://www.reddit.com/r/BmwTech/com...lunking_sound/

Wow, appeared to be the exhaust mounts for that person, exhaust was coming in contact with some bar under the car. Going to check this out on my own.. the way he explained the issue is exactly what we’re encountering.

[Haneef]

Originally Posted by TJZ67201

Wow, appeared to be the exhaust mounts for that person, exhaust was coming in contact with some bar under the car. Going to check this out on my own.. the way he explained the issue is exactly what we’re encountering.

And one of them says replacing steering rack resolved it. lol. So shocked the M340i also has this but good to read other perspectives. Will post anytime I find something useful

[Haneef]

Its insane, read this too. This is a X3 M40i. Such a prevalent issue. Granted it is in a different location for this..

https://x3.xbimmers.com/forums/showthread.php?t=1903007

[TJZ67201]

Originally Posted by Haneef

And one of them says replacing steering rack resolved it. lol. So shocked the M340i also has this but good to read other perspectives. Will post anytime I find something useful

Yeah the M340 also had a similar issue with the front axle. Separate from what we are experiencing (thankfully) but that explains why the steering rack fixed their issue.

[TJZ67201]

It was not the exhaust. I see the cross link bar under the vehicle but it is no where near making contact with the exhaust. All exhaust mounts are good on mine.

While I was under there, I noticed the metal straps that hold up the gas tank (under the black plastic covers) make some noise when moving. Put some rubber strips between it for some isolation, let’s see if that helps at all

[Haneef]

Originally Posted by TJZ67201

It was not the exhaust. I see the cross link bar under the vehicle but it is no where near making contact with the exhaust. All exhaust mounts are good on mine.

While I was under there, I noticed the metal straps that hold up the gas tank (under the black plastic covers) make some noise when moving. Put some rubber strips between it for some isolation, let’s see if that helps at all

Any good news?