Awhile back, I asked about a pounding sound I got when running the hot
water. It was like a rapid plumber's hammer. I thought it was coming
from the header, but it sounds now like it's under the sink. The
dishwasher is connected to the same mains, and doesn't cause the sound
when run. Now, the cold water is beginning to make this sound.
The hot water starts to pound (~3 pounds a second) after a few
seconds--about when it starts to get warm. The cold water starts almost
immediately if the cold is opened very wide. If I close it a little,
the pounding softens but the rate will stay the same. If I run the cold
a little more closed, it doesn't happen.
What could possible cause this? Again, this doesn't happen with the
dishwasher. However, if I start the hot water with it running, I get
it, and sometimes it'll continue after I shut off the water. The only
way to stop it is to stop the dishwasher, at which point it stops even
if I restart the dishwasher.
I'm thinking it's time for a new faucet anyways but I'm not up for the
replacement now. It's a ball-type faucet if that helps. I reached
under and it doesn't look like there are any accessible nuts for
tightening the pipe to it.
This all started after I replaced the undersink shutoff valves. I
assume I shifted the copper pipes around a little bit and it's now
causing some trouble. Could it be that I pinched the pipe someplace?