Quote:
Originally Posted by Krisp97
***RESOLVED as of 3/18/24: Here is a video of the noise at cold start. In my case, the culprit was the Deflection Pulley aka Idler Pulley: https://www.youtube.com/shorts/7L_otqh_Bxk
I have found little information regarding this sound with my G80 M3 on cold start in low temperatures. I noticed when in the low 30 degree F and below, the car squeals/whistles for a few moments, sometimes a few minutes if very cold.
Initially thought its probably a belt or pulley, took my car to BMW and they said it was due to aftermarket intakes. I knew this wasnt the case, reverted back to stock: same sound persisted. Not related to intakes at all.
Car is back at BMW a second time now since 01/10/2023. They have replicated and identified the sound, thinking it was a pulley or belt sound. They replaced the belt, retested, and today said the noise persists. I miss my car!
They are opening a case with BMW NA and going to record audio clips to submit with the claim. I am frustrated I haven't had the car long and now this happens, but my dealership has been very determined and eager to sort this out.
I will continue to post updates as I get them. I also posted some in the older thread about G82 M4 Cold Start Noises. I started a new thread in light of helping others that seem to have this mysterious noise that is not documented hardly anywhere.
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Did the squealing happen sometimes when driving very slowly like through a neighborhood or parking lot? Think I may be experiencing the same thing. Only happens sometimes for me though.