I know absolutely nothing about irrigation systems and was hoping someone here could lead me down the right path. I have one zone on my system that has been giving me all kinds of issues, which include not coming on when they are supposed to, heavy rattling by on of the lines and low pressure once they finally pop up. Any help? Thanks!
It sounds like the valve is bad. Either rebuild it or replace it.
It would help if you could find the make and model of the valve.
Or, post a pic of it. Go to www.tinypic.com, upload your pic then cut n paste the "forum" code to your post.