01-17-2017, 01:37 PM | #24 |
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Are these 'rocks' in the brake shield common? I have just noticed as of today that when in reverse and the first brake there is a crunch and then its fine. I have not heard any noise when braking after moving forward... yet.
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01-17-2017, 01:42 PM | #25 |
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Actually to add to this when it was quite cold the other day, around -30C I fully warmed up the car and did some 'break in' pulls. 2, 3 and 4th kind of stuff never full load and under 5500rpm and did some braking from various speeds to help bed etc... anyway point being after 5 minutes of that I heard a winding noise metallic in nature underneath the car just behind me when I would accelerate it would wind up and naturally decelerate it would wind down. It was very odd and it had not done it before. i took it in the next day but it had warmed up to -10c and wasn't doing it anymore. dealership put it on the hoist and checked everything out and took it for a test drive and couldn't duplicate the noise. tech guessed that it was a hanger underneath the car but as they couldn't duplicate it got a 'nothing wrong clean bill of health' and i gave the 335 back and left.
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01-17-2017, 01:49 PM | #26 | ||
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01-17-2017, 02:21 PM | #27 |
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I've got a 17 (took delivery 1 month ago), and I've definitely heard what I would describe as the "can crunching" noise on multiple occasions. No odd performance to report though aside from the sound
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01-17-2017, 02:48 PM | #28 |
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01-17-2017, 03:09 PM | #29 |
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thats the thing, I was driving for half an hour nice and easy and let everything 'warm' up to temp and it still did it. Although perhaps in -35C it can't actually ever 'warm' up.
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01-17-2017, 03:11 PM | #30 | |
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01-17-2017, 03:15 PM | #31 |
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01-17-2017, 03:15 PM | #32 |
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Ah ok - the diff break in oil is very heavy, so it would be even more viscous at low temps, which could be why you're seeing this.
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01-17-2017, 03:36 PM | #33 | |
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01-17-2017, 03:53 PM | #34 |
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Lots of panic over rear diff noises. We need to understand that there is a electronically controlled clutch in the diff that activates as driving conditions warrant the need for power to be put a different drive wheel. These diffs will make some noise, they are not like a conventional differential so comparing it to what you have experienced in the past is not relevant. These differentials have been used in the M5, M6, M3 and M4 for years and you will be hard pressed to find many actual issues with them beyond the recall that they initiated proactively. When you understand how this differential works it is easier to understand how it will make some noise from time to time.
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01-17-2017, 04:01 PM | #35 | |
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Last edited by DETRoadster; 01-17-2017 at 04:53 PM.. |
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01-17-2017, 08:12 PM | #36 | ||
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01-19-2017, 07:05 AM | #37 |
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Drives: M2, 135i, Xclass
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This is what is says in the owner's manual regarding the drivetrain.
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01-19-2017, 07:24 AM | #38 |
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GUYS GUYS GUYS GUYS!!!!! 95% of all this here are the small rocks in the sheilds. Get some mesh covers and be done with it. Im 7k miles deep and that issues was solved many many moons ago by now. M4's have same issue. Its giant wheels sticky rubber and open brakes catch debris at will.
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01-19-2017, 08:10 AM | #39 | |
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01-19-2017, 08:40 AM | #41 | |
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The rocks is more of a screeching/grinding noise. |
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01-19-2017, 08:32 PM | #42 | ||
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I'd take it to the dealer but I'm not interested in people beating the car around to replicate. I will give it some time and see if it gets worse. One thing is for sure, it's annoying as hell. Today I was in comfort mode for a lengthy phone conversation and it was worse in comfort, which I suspect is due to less load. |
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01-19-2017, 08:35 PM | #43 | |
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The good news is that if you apply lots of torque to things that have give/play, they will eventually snap. So time will tell! |
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01-20-2017, 03:56 PM | #44 |
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My car has these noises that everybody is talking about here. I'm still under 300 miles on my car and been to the dealer numerous times for "Check Engine" light coming on every 50miles and to check the noises issue. They can't figure out either issue!!!!
For one, the they're unable to duplicate the noises since they come and go. As far as the "check engine" light issue; they're telling me that I need a new "Crank Case" but before they do the repair, they need to consult with Germany. I've had a loaner for a week now and no end in sight. The tech told me that my new car is being used as a guinea pig; I said WHAT??? I'm extremely angry.... |
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