Our kitchen faucet has separate hot/cold knobs, with the faucet extending from wall, no sprayer. Recently, there is a loud knocking/rattling that comes and goes when using HOT water. The water pressure seems to surge/reduce in time with the sounds. Noise is limited to faucet itself- other plumbing doesn't seem impacted at all. Any ideas are appreciated!

Our kitchen faucet has separate hot/cold knobs, with the faucet extending from wall, no sprayer. Recently, there is a loud knocking/rattling that comes and goes when using HOT water. The water pressure seems to surge/reduce in time with the sounds. Noise is limited to faucet itself- other plumbing doesn't seem impacted at all. Any ideas are appreciated!

You either have a screw that's loose holding the washer,(see image) or the washer's split and vibrating. Turn off the water and open up the hot water side and check the washer. Regards, Tom