what does it taste like? there are lots of "burning" flavors that you might encounter when dealing with e-cigs.
burning the coil tastes like a hot metallic dry hit. (this is caused by the coil not making good contact with the wick)
burning the wick tastes like (silica tastes like a nasty chemical) (SS mesh tastes like silverware but not as hot as an over heated coil) (cotton tastes like burning cotton) this is caused by the coil compressing the wick and not allowing enough
juice to flow into the coil area) or is just caused by poor wicking.
its important to note that the first few times you fire the coil with juice on it it creates a layer of carbon.. this layer of carbon is good it provides a nice thermal barrier between the coil and the wick. this is why at first you dont get decent hits on a new coil it takes about 10 drags to get it really broken into its sweet spot. over time the carbon will build up and evidently clog up the wick and coil. (you can see the carbon build up) then its time to dry burn or replace the coil. i recommend cleaning off the coil with a brush to remove the layer of fine ash that's left over from the dry burn. just wait until its totally cooled off and scrub the coil with a paint brush. then blow on it a few times and its good.