The answer to 'my faucet installation smells bad' is that the most common cause is improper installation or a faulty seal. This can allow sewer gases to escape from the drain pipe and into your home, creating an unpleasant odor. Symptoms may include a strong, sewage-like smell coming from the faucet area.
To fix the issue, you'll first want to check the faucet gasket and other seals around the installation. Make sure they are properly in place and not cracked or damaged. If the seals look good, the problem could be with the drain pipe itself. You may need to disassemble the drain pipe and check for any clogs or damage that could be allowing gases to escape.