How do I fix code p0505. Also is it related to my power steering sounding funny?

Check the air intake boot, the throttle body for build up and make sure the engine coolant level is full. Also, did you do a computer re-learn when you replaced the IAC valve?

Check for vacuum leaks. Put the vehicle on a scanner and check the datastream as well. We've replaced several pumps in Acuras. How does the fluid look. Try flushing it first and see if it quiets down.