03-23-2024, 04:56 AM | #1 |
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New M2 with a strange noise on bumpy / uneven road surfaces
Hi guys.
This is my first post on your forum. I'm wondering if anyone can help me with a couple of small issues I have with my new M2. I have only had the car one week, coming from a couple of years ownership on an M2C, and I absolutely love it! The main issue is a noise coming from the rear, but hard to tell if it's from outside the car or not. When I drove the car away from the dealership, I immediately heard it and thought maybe the boot wasn't shut properly, as the noise was a metallic "clink" you might compare to a steel clip in a door not correctly seated. I've been reading through the forum over the past few days and have seen a number of posts relating to suspension noises, but they seem to be a little different. The noise I can hear is not a thud, it's a metal on metal noise. Sometimes it's not just a single "clink", it's two or three together, almost like a rattle. I've had the seats and arm rest down, checked the battery seating, etc. I'm running out of ideas. Oddly, you can go over large bumps and not hear a peep, and then go over the smallest bump and it goes off. What I can say for certain, is that if either rear tyre goes over a catseye, it always happens. The other issue is to do with the collision warning system. The icon in the centre console comes on at random. For example, reversed from my driveway this morning, starting going forwards and it came on and remained on for roughly 20 seconds, even though there were no other cars on the road. It also came on again a few miles later, also when there were no cars around. Anyway! Despite these two issues, I'm so happy with the car. It's been a while since I've owned a brand spanker! |
03-23-2024, 09:06 AM | #2 | |
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Albator_IIII1020.50 Toadus1.50 |
03-25-2024, 03:06 AM | #3 | |
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I tried this, but couldn't get any noise to happen when switching it on / off. I had a friend kindly sit in the back with the back seats down. After some testing, he was able to locate the noise which was coming from the rear right wheel area. Other than that, still stumped! I've informed the dealer |
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04-02-2024, 04:55 PM | #4 | |
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Toadus1.50 |
04-06-2024, 08:09 AM | #6 |
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It's not going in to the dealership until the end of April. I will update with the findings as soon as I can. As long as there's some rough road near to them, they should be able to pick up on the noise.
I drove over some cats eyes recently, and when the rear right wheel hits one, instead of the usual "thump" sound, you hear a "clink". Very odd! |
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04-08-2024, 03:24 AM | #9 |
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04-16-2024, 01:25 PM | #11 |
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This is highly unlikely since your car is new and unmodified. Try shaking the car vigorously while in a stand still by standing on top of the door frame both left and right and see if it duplicates the sound. If it does it's definitely suspension related. I recently replaced my springs and I forgot to tighten the rear sway bars to torque specs and it made a similar sound to yours. It was not loose but torquing it to specs made the sound go away.
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Toadus1.50 |
05-02-2024, 02:36 AM | #12 |
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I had my RIS done the other day and the noise investigated at the same time. They discussed with me that they found a slightly loose strap on the driver's side fuel tank, which meant that the tank could foul the heat shield with enough force. I was delighted to hear this, as it sounded very plausible. Sadly, on the drive back home, the same noise was still happening. The mystery continues. I hope it doesn't turn into one of those things that never gets sorted.
The dealership seemed very thorough. They said they have 4 technicians underneath, trying to discover any noise. They road-tested and all seemed well. They were kind enough to lend me a car in the meantime, as they weren't 100% sure how long the RIS + investigation would take. It was another m2! And it didn't make a single peep of noise; so it's not just in my head! |
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05-06-2024, 02:19 AM | #14 |
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I can't yet say with 100% confidence, but I *think* I've figured this out. I've noted a few stretches of road where the noise always occurs, so it's given me the opportunity to do some testing. What I've found is that if I apply the brakes when the rear tyres go over the bump / rough bit of road, there is no noise. If this is the case, it would seem perhaps that the noise is coming from the the rear brake pads? Does the sound in the video marry up with what a loose pad might sound like? Thoughts?
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05-06-2024, 11:25 AM | #15 | |
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The noise could be from the pads, although there is hardware to prevent pad rattle. But the hardware could be missing or broken. For suspected brake hardware, pads, or ?, the car needs to be properly lifted and the wheels left hanging so they can be removed and the brakes inspected for any thing that could possibly account for the noise. At the same time a check of all the under body panels needs to be made looking for any loose panels. And this would be a good time to check whatever suspension/drive train hardware one can get at for any play or looseness. |
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Toadus1.50 |
Today, 10:30 AM | #17 |
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I'm sure you've done this, but pull all of the stuff you can out of the rear of the vehicle (seats, carpet in the trunk, side panels if necessary) and go lie back there while you have someone drive around. That should at least tell you if it's coming from the interior or not, and it may even pinpoint the general area on where to start digging.
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