I've had a couple Evod, Protank, and T3 coils just not work right out of the bubble packaging or shrink wrap. If I had that head I'd rebuild it, but for now, just swap the head out. Evod battery is just a clone of a Joyetech Ego battery, so it can be at 3.3v or 3.7v output. Most times Evods ship assembled with a 2.2 or 2.5 ohm coil, not common, but I could imagine even on a 3.7v output battery, a 1.5 to 1.8 ohm coil wouldn't be burnt taste all the time. Not like the coil heads are that expensive to replace either, about 3 USD a head or 12 USD for a pack of five, still cheaper than a carton of smokes in the long run as a head should last at least 2-4 weeks.
Next issue would be as stated above, Propylene Glygol to Vegatable Glycerin ratio. If the liquid fresh is extremely watery and thin, then you have more PG in the mix and shouldn't have any wicking issues, if it is thick almost oiley or syrupy, there is more VG in the mix and that can cause wicking issues if you are doing chain vaping or several successive hits in short amount of time. To remedy this, is to do primer puffs, take a couple puffs without firing the button to hopefully pull some liquid into the coil cup to burn before firing, on my T3's and Protank I can tell I am getting liquid in by bubbles floating up to the top after doing these primer puffs, Evod and MT3 it is hard to see this through the sight windows, but the principle still works. If this still doesn't produce anything but a burnt taste, then the coil is super gunked up needing a cleaning, dry burn, rinse and dry out, the wicks are scorched beyond redemption, or the coil has a hot leg or hot spot and not evenly vaporing, it needs replacing.