Quote:
Originally Posted by ind_can
Have had the car for a few days now and noted the following mechanical observations which I'm having a hard time diagnosing. Any suggestions?
1) A loud high pitched whine from the engine bay when lightly revving the engine, particularly between 1000-2000 RPM. This occurs in all gears, even neutral. It's coming from the belts area and quite noticeable from inside the cabin but also standing with the hood popped.
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First off, I believe we may have actually corresponded about my vehicle. Mine was the Ontario car with CCBs and a 2 year BMW extended warranty.
Anyways, I have not experienced any of the issues that you mentioned, but I thought I would chime in on a couple of them.
I am not sure of your history with BMW vehicles, but I have found that my M cars have been noisier in general than the more mainstream BMW vehicles I drove before. Not annoyingly noisy - you just hear more of the mechanical of the car working away.
When I first drove my M4 off the lot, I was concerned with all the mechanical noises, as "issues", but was re-assured by my dealer that a lot of what you hear is amplified. For M cars, design decisions are more performance oriented than comfort/luxury oriented.
However, nothing would be what I classify as "loud". So if your definition of "loud" is relative to say a 650i, then it might just be that your ears need to get used to the sounds of an M car.
But the grading/scraping definitely does not sound normal. No car (M or not) should be making those kinds of noises.
Also, regarding the brakes - because that car had been on the lot for quite while, I wouldn't be surprised if the rotors picked up a lot of oxidation. I once had a Mercedes that I had sit in my garage for a month and when I went to finally drive it, for the next several days the brakes were rough and noisy. Perhaps doing a proper bed-in procedure would resolve your issues there. There's lots of posts in the forum explaining how to properly bed in brakes.