1. A method of operating an internal combustion engine having a plurality of cylinder banks, each bank including a plurality
of cylinders, the method comprising:
operating the engine in a skip fire operational mode that utilizes most evenly spaced firings;
while operating in the skip fire operational mode, identifying a period in which a single one of the cylinders in a first
cylinder bank is isolated as the only firing cylinder in the first cylinder bank; and
conducting a diagnosis of the isolated cylinder during the identified period, wherein the diagnosis conducted on the isolated
cylinder is not conducted on the isolated cylinder when such cylinder is not isolated.