01-06-2017, 01:46 PM | #1 |
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A Cry for Help - Diagnosing a Drive Train Issue
Greetings all,
Long time (unregistered) lurker, first time poster in need of some serious help diagnosing a problem with my M4. I have searched high and low on this forum (and beyond) for anyone else who has experienced this issue (I've been to the dealership twice for the issue to no avail [they could not reproduce]) and I've found nothing. Needless to say I'm baffled and hoping I can leverage the vast knowledge and experience of the BMW and F80 community to help diagnose what's gone wrong. The Problem A noise (which sounds like a squeaking old mattress -see Exhibit-A for a recording) that was first noticed while I was changing gears in traffic and has progressed since then. The Car
*All mods (with the exception of the heat exchanger) were present on the vehicle thousands of miles prior to the first instance of the sound. When does it occur?
Sound Captures:
Misc. Characteristics
The noise is not the... Here's what I can rule out:
Could it be...
Once again, any help that can be provided will really help me out as I'm at a complete and total loss what to do. Thanks again! |
01-06-2017, 02:01 PM | #2 |
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I can't hear the sound clips ,,, maybe just my iPad,,
What out hearing it,, just a guess,, do you have the Carbon Roof? Is coming from a misaligned joint of the carbon fiber roof?.
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01-06-2017, 02:04 PM | #3 |
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All of your videos are set to private.
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01-06-2017, 02:57 PM | #5 |
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Your M1 to M2 toggling is the biggest tell and the easiest way to diagnose.
Reprogram your M1 to have the M Adaptive to default instead of sport. Recreate the conditions in which toggling to M2 triggers the sound. Did it happen again? If the sound disappears, then it's most likely related to your suspension. Do this a few times to make sure that the results are consistent enough to make the correlation. When you are convinced, go back to stock suspension and see if the problem goes away with M1 suspension is set to Sport+. Problem solved. Contact Dinan about replacing your parts, it's warrantied by Dinan. If the sound doesn't go away, do the same thing for the transmission, steering, and throttle. Steering might be different for you since you are in non-sport in M1. If you find that the throttle setting has an effect on the sound, then it might be your exhaust, or more precisely the exhaust flap that opens up the other side of the exhaust. When in efficient mode, the flap opens and closes during certain instances of throttle. It's open full time in sport or sport+ mode. Does the sound appear when in sport modes? If it does, you could rule it out since it doesn't move in those modes. Have your shop look at that exhaust and check to see that the flap is operating properly. Anyway good luck, and if you do solve the issue please keep us informed!
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01-06-2017, 02:59 PM | #6 |
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rock in the dust guard?
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01-06-2017, 03:41 PM | #7 | |
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Quote:
I do have a carbon fiber roof, however the sound seems to be coming from under the vehicle rather than above. A good suggestion though that I'll double check. |
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01-06-2017, 03:42 PM | #8 |
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I am betting he is hearing the exhaust valves open or close when switching from efficient to sport+.
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01-06-2017, 03:43 PM | #9 | |
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01-06-2017, 04:11 PM | #10 |
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Intersting thought.
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01-06-2017, 04:29 PM | #11 | |
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thats what i initially thought he was hearing, but thats not what his videos sound like.
Quote:
it does sound like the suspension though.
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01-06-2017, 04:44 PM | #12 | |
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Quote:
Based on what the OP has told us so far, my money is on the exhaust flap with the Adaptive Suspension in second.
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01-06-2017, 04:45 PM | #13 |
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I don't think so. That sound is a lot more terrifying for some reason.
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01-06-2017, 05:00 PM | #14 |
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Do they not have a dealer in Seattle?
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01-06-2017, 06:17 PM | #15 |
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There's a dealership in Seattle, which I've been to twice, but they could not reproduce the issue. I've just recently sent the service advisor the recordings as well and they state it's probably an issue with the brake rotor rubbing against the dust guard. The issue I'm facing as an owner who isn't super car savvy is, although I respect their input as experts, my gut doesn't think that is the issue.
*Edited to add: Of course, no disrespect to the dealership intended as it's not a straight forward issue I'm having. Last edited by Leng8093; 01-06-2017 at 06:26 PM.. |
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01-06-2017, 07:00 PM | #16 |
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OP, can you time it so that a tech or shop foreman rides in your car after 20-30 min of driving so you can replicate the noises right then and there? Get a nice loaner while they fix and call it a day
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01-06-2017, 07:31 PM | #17 | |
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But who knows, maybe they are right? I hope they are right, because that is an easy fix.
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01-06-2017, 08:08 PM | #18 |
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100% spot on. My second visit I requested that very thing and, to the dealerships credit, they sent a foreman along for a ride who acknowledged the noise but the diagnosis and resulting scope of work (replaced a belt related to the clutch -going off memory) did not resolve the issue.
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01-06-2017, 08:08 PM | #19 | |
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01-06-2017, 10:55 PM | #20 |
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My vote is exhaust valve flap.
I have the macht schnell evc module thus able to open and close the flap at will. It is louder than most think. Yours may be extremely squeaky. How to rule this out for sure is simply disconnect the flap motors then drive the car around and see if you can reproduce the sound. BTW, I have the Dinan S2 with CAI, exhaust, & suspension too and I leave the valves open all the time!
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01-07-2017, 04:38 PM | #21 | |
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Quote:
The 20-30 "warm up" to the noise would make sense in that the parts are heating up and expanding which exacerbates the squeak. That said, in the second video the squeak happens a few times in a row at very low RPMs and I didn't think the flaps would open/close that much with nothing else going on. (btw, I know the 6MT is different but I can't imagine driving my DCT in 3rd at ~25 MPH) Unless those exhaust flaps open/close a hell of a lot more than seems reasonable I'm leaning towards suspension and one of the actuators/electric value-y type things: it heats up with road use, then squeaks, but when you try to cycle from M1 to M2 and back you essentially heat-lube the parts and they don't squeak anymore. |
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01-08-2017, 02:27 PM | #22 | |
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Did some thorough testing yesterday (as jmg suggested - big shout out!) and, long story short, it was toggling the M throttle in anything other than "efficient" mode which causes the sound. Specifically, what I did was drive the car around in default, non-M settings (40 minutes of driving) and, lo and behold, no sound at all, everything was perfect. Next, I went through the individual M settings and tested each in isolation against the sound producing criteria, suspension, steering, MDM -all passed except the exact moment I adjusted throttle from "efficient" to either "sport" or "sport+", bam! There it was! Car's currently at the dealership and, after test driving with the shop forman (he didn't have an idea off the top of his head why this would be occurring), my fingers are crossed they now can squash this issue once and for all. Big thank you for all the input and suggestions I've received from everyone! Absolutely invaluable in lending me a hand to track this issue down! As an aside, any thoughts of what it could be in the engine that the M throttle setting adjusts (exhaust valves as was previously suggested)? |
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