Anyone have any idea on how to located in ground sprinkler valves? I have 9 zones, and out for the 9 I can only located 4, and of course I have a zone not working which is one of the valves I can’t seem to find. 

Valve boxes are are scattered around the lawn and identified by a green access cover that is typically rectangular but sometimes round, if there is just one valve.  Each valve box will have a manifold that can service up to six zones.  Sometimes valves are located near the control panel, just inside or outside the garage, or wherever the water source is.  If the boxes got covered in dirt and grass, you may have to use a metal detector.

The  company that installed the system should have left a blueprint indicating head and valve box locations.  You can probably call them and ask for a diagram, which they should have on file.  

Metal detector or thin rod and start probing. sometimes you can look for a low depression in your lawn,  when i bought my house the curb water main shut off was grown over found it with my metal detector in 5 min. 

Ahh glad you said that, I googled couple hours ago and saw metal detector. Got someone to let me borrow it but I’m having a hell of a time figuring this thing out. Going try to google user manual to figure what setting to do and all that.