I had an odor coming from my new kitchen sink strainer.
Is your odor a chemical smell? My is (was) and I had been having problems with the strainer making noise so I decided to have it replaced.
When I went to Home Depot to pick one out I noticed the cheaper ones had a horrible chemical smell and a warning on the box that the product contained chemicals known to cause cancer.
I also checked a more expensive brand, Koehler, and there was no chemical warning on the label.And.............no smell whatsoever.
I don't know if this is what the problem is for sure but if you smell a chemical odor its probably the material used in your strainer or other parts.