How you doing..I recently purchased a 1993 325i with a M50 engine...Just recently when i turned on the engine, it turns on but a loud buzzing happens..it lasts for about 10 to 15 seconds then stops..i turned off the engine and fired it up again and it didnt do it at all...but i noticed that if i let the engine cool it will happen everytime..i cant figure it out..Any ideas??..Any will be appreciated..Thanks Guys!!