CHeck lots of places for metalic taste: mixer or beaters, whisk, water etc.
It is possible for the pancake ingredients to react with raw aluminum but that would have to be a pretty big scratch. Make the pancakes simultaneously in two pans one scratched teflon, one not. Both taste metalic? not the pan.
FUmes? dirty pan bottom, soap residue, lp gas odor (as stated above)
What brand of pans? Quality pans last generations. (but all my relatives died..maybe it was the pans??)