After about two weeks without incident, my Mini made the noise again today. This time the temperature had dropped to around -2 Celsius while I was at work, and the car sat for around 8.5 to 9 hours in the parking lot. This was the worst it has been yet, but it still didn't sound bad while idling, but as soon as I gave it any gas at all, around 1200rpm, it would start to get loud, and only became louder as it approached 2000rpm; I didn't rev any higher. I let it idle for around three minutes, and it was still there if I increased the revs... at four minutes, it was still there. Finally, after about five minutes I turned it off and back on... oddly enough, when the engine started and the tach hit 2500rpm+ (whatever it hits briefly when starting), it sounded normal, but again if I gave it much gas it would get loud, but not as loud, and now only at closer to 1800 or 2000rpm. It had become much more quiet, so I pulled out and started to dive. By now, about seven minutes (or more) had passed, and it was sounding pretty normal. I drove home without any probems.
I don't know what to think at this point.
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