Method and system fault detection for synchronized correction.

A method for determining misfire in a reciprocating engine, the method including the steps of: establishing a misfire threshold of accelera- tion; establishing a threshold of sub-misfire acceleration threshold representing a fraction of misfire acceleration established; detecting the incremental engine position (401) and provide a series of data points dependent thereon acceleration; averaging the series of acceleration data-points and providing a synchronous correction factor dependent tooth them unless a data point in the series of acceleration data points ex- yield acceleration threshold sub- acceleration misfire where the synchronous correction factor identifies a periodic behavioral mo- delo associated with the opera- tion engine representing the normal com- bustion behavior and general system noise; providing a data point Gido synchronously corrected acceleration dependent on one of the series of acceleration data points and the synchronous correction factor; and indicating a fault condition on (421) when the data point corrected acceleration for- synchronous ma exceeds the threshold misfire acceleration set.