1. A method for performing diagnostics on a skip fire engine control system, the skip fire engine control system including an engine having a plurality of working chambers, the method comprising:calculating an operational engine torque;
operating an engine in a skip fire manner to deliver the operational engine torque;
calculating a reference engine torque using a torque model wherein the torque model involves estimating torque individually for each working chamber;
comparing the reference engine torque to the operational engine torque to assess accuracy of the operational engine torque calculation;
identifying a potential error when a discrepancy between the calculated reference engine torque and the calculated operational engine torque exceeds a threshold; and
performing an action in response to the identification of the potential error.