12-19-2023, 08:29 PM | #45 |
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You are one of the lucky ones I guess. Seems like it's very common on the G80 platform and there has yet to be any sort of service bulletin or known cause
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01-07-2024, 05:45 PM | #47 | |
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I started it a few times this week in the 20 degree F region and sometimes made zero sound, others it squealed. Humidity possibly a factor?
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03-02-2024, 07:13 AM | #49 | |
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January 2023, BMW engineering told them to remove the belt and start the car to verify it is coming from a pulley, which it did eliminate the sound. They replaced my belt and belt tensioner then but that did not fix it. I am thinking it’s the lower idler pulley as I have read elsewhere on a X3M/X4M that it seemed to fix it. It’s down towards the bottom if you look at an S58 engine diagram. If/when I bring it in this time, I am hoping they can get clearance to replace the idler pulley. It’s almost like trial and error hanging parts at this point! I will report back any update |
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03-02-2024, 04:38 PM | #50 | |
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03-02-2024, 06:30 PM | #51 | |
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I am hoping if enough bring this in, it will become a TSB (Technical Service Bulletin) so more can get this easily fixed and no more of the trial and error.
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03-03-2024, 01:37 PM | #53 |
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It doesn't sound normal as other BMW's don't seem to do this. Not even all S58 motors seem to do it. Something needs to be dug into on the engineering side
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03-04-2024, 06:37 PM | #55 |
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I have a video of mine as well, made the sound for 20 seconds straight. I don't know how to upload to this forum with an iPhone video
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03-05-2024, 10:12 AM | #57 |
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I am dropping mine off this weekend since temperatures are dropping again, I am hoping it lets out the scream Monday morning. Hoping this is the time something gets diagnosed!
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03-05-2024, 10:14 AM | #58 | |
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loud whistle/squeal on start up noise after rpms dropped edit: i am fully stock. followed break in procedures. car currently is only 1.5months old and i have about 4k kms on it. has done this around 5/6 this winter usually on cold snaps or whenever the weather goes from + to - |
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03-05-2024, 10:36 AM | #60 | |
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https://www.youtube.com/shorts/7L_otqh_Bxk
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03-05-2024, 11:12 AM | #61 | |
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03-05-2024, 11:24 AM | #62 | |
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My service center has been awesome in attempting to diagnose it. If your dealer tries to tell you its the belt and/or tensioner, that is not going to fix the issue. Been there already lol
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03-06-2024, 01:01 PM | #63 | |
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bmw idk if it’ll fix it cause parts are a week out but seems there is a service bulletin for it. like u said tho its a drive belt tensioner and an idler pulley replacement |
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03-06-2024, 04:32 PM | #64 | |
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03-11-2024, 11:46 AM | #65 |
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Update on my car: I send a video to my dealer of the noise and just dropped it off Saturday night. It sat until today, Monday morning and they were able to replicate the sound briefly and submit it to BMW Engineering, they are currently awaiting guidance from them on what to do. I am predicting idler pulley is going to be targeted at some point as they have record of my tensioner already being replaced last year.
They may try to replicate it again over the next few days but atleast have something to submit over already. Will circle back here with an update. Hoping this becomes a TSB eventually for those who have had to deal with this
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03-12-2024, 02:15 PM | #66 |
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Hey guys, been following this thread. I agree with OP that this may be related to the idler pulley. I have another thread talking about the issue. I live in a dry desert so I hardly noticed a whine or have it cold enough to replicate the issue upon start up. However, recently we had a few rain showers which brought in humidity. While in idle this noise or a similar noise occurred. Fast forward a week or two the weather completely drys up and warms. With this the noise completely disappears. Again, last week we get another shower of rain and humidity has been hovering around the 50% range here. The sound returns.
Here are the sounds mine make. Again no codes are thrown or any issues with the car being brought up to operational temperature. It does sound like idler pulley may be improperly grease packed. https://files.fm/f/ak5fxm46bq https://files.fm/f/utydgsbhaz These are the two separate occurrences that I recorded! |
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