After disassembling it i changed the coil and make sure was tight enough . Put juice in waited 10 min . Is a bit better i start to get some  vapor from 4 v. But is still little . My everyday device is a janty clearo and even that give me a nice cloud of vapor . Tried the evic with a megatank  from vapeonly   ( just to check that the evic was fine and that worked ) . 
Any other suggestions?