Also experienced burning plastic taste with my VN in the past, after reading some threads on ECF I was able to determine that the taste came from the silica sleeve that's separating the +/- wires . Solved the issue simply by removing it using scissor and tweezer. Couldn't find a pic since I already removed mine, but here's the thread that address this issue:
http://www.e-cigarette-forum.com/forum/tanks/332596-vivi-nova-mini-2-5-burnt-taste-fix.html
http://www.e-cigarette-forum.com/forum/tanks/332596-vivi-nova-mini-2-5-burnt-taste-fix.html
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