Did you say you also have an automag? If yes, install the Xvalve into your automag and test the Xvalve.
ACE setting:
ACE 00 – ACE turned off
ACE 01 – Short delay
ACE 02 – Long delay for multi color and high contrast paintballs.
Keep your ACE off and your Emag board off and switch to mechanical mode (M) until you get the Xvalve running. Once you get your Xvalve running, turn the Emag board on and leave the ACE off until you get it working in Electronic mode (E).