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Sewing machine like noise when accelerating - when COLD only
When the car first starts in the morning and I accelerate from a stop, it makes this annoying tap-tap-tap noise, that makes the engine just sound really loud, that goes very quickly and seems to be in sync with how hard I hit the gas. The engine purrs like a kitten and is pretty quiet when at idle in Park, neutral, drive and reverse - the noise only comes when I accelerate (it doesn't occur if I rev in in park). It goes away somewhere after 2000-2500 RPMS and is gone completely (or at least barely there) after about 10 minutes of driving. The car has been meticulously taken care of and had all oil changes and everything done on time so I'm confused - and scared - about what is wrong.
I always blare the radio so I'm pretty sure this could've been there for a while but I don't really know - I've only had the car for 6 months. I just heard it by accident when the radio was off first thing in the morning.
Anyone have any ideas?