To better isolate the noise yourself, you should take a 3 foot prybar or something similar made of steel and hold it up to a cylinder head or the engine block and put the other end up to your ear.
The closer the prybar is to the source of noise, the louder and clearer the noise will become.
Since this symptom only lasts for a short time, you should have an assistant start the car for you.
I would suspect that since this only happens when the auto choke is on, that this is not an internal engine problem, otherwise it would occur much more often. Perhaps there's a loose part rattling around or not secured properly?
Good luck!!
Ben
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