Did you vape off the primer liquid before you started vaping with it? This is the primary cause for burnt taste.. Put TWO drops of juice and vape away, don't inhale, until the taste is gone. But, if you have used it a lot before this you'l have to do a lot of dry burning, to burn the original primer juice off. Primer juice is what the factories put on the atty's to keep them moist, but you must burn it off before using..