A5 H.E. grip does not fire on full auto

I tried to read the other threads, but they are to many to read through and most are not the problem I have.

I can shoot without air attach to it in full auto or semi. With tank attached I can fire semiauto. In full auto I can shoot the 3 shot before going into full auto, but it fails to cycle when it goes into full auto. You just hear the board going to full auto but no air going through the chamber. What could it be? I tried 4 of my rechargeable batteries. All full charge. Even regular new alkaline battery does the same. It fire the 3 shots before going into full auto stage. Its only when it actually goes into full auto where it fails.

Would greatly appreciate any input.

Thanks for the link it was helpful for me to change modes, but the problem I have is that it will fire air through it on the first 3 shots of the initial stage of full auto, but when it kicks into full auto no air comes out and all you hear is the board actuating the solenoid "click, click, click, click". Its seems that air is not charging fast enough in the valve. The set up I have on my A5 is that I have the cyclone feed upgraded to the Tech7 kit with the exhaust ports. Squishy paddles, new dawg bolt, and polished sears and rear bolt.

Its a 70/4500 tank attached to the gun.Has 3200 worth of air in it.I can rapid fire on semi. Just won't cycle to full auto after the 3 shots in full auto mode is initiated.After that air does not charge in the gun. Only the solenoid is cycling through full auto.

try to shim the selinoid, shortening the throw will give it more power to trip the marker. If its clicking and no air is comming out at all I dont think its recharge time at all, if no air is comming out there is no recharge needed. The selenoid could be dirty as well. Try to shim it. If that doesnt help you may have to look at getting a new one. experament with different thicknesses of shims.