Abstract: A method of determining a cylinder that has a failure in an engine includes accessing an on-board information system associated with the engine; retrieving data from the on-board information system; filtering the data to derive at target data; and decoding the target data to determine a number of a failed cylinder and the cylinder's corresponding cylinder rating. A system for determining a cylinder that has a failure in an engine includes an access module, a retrieve module, a filter module, and a decode module. The access module accesses an on-board information system associated with the engine. The retrieve module retrieves data from the on-board information system. The filter module filters the data to derive at target data. The decode module decodes the target data to determine a number of a failed cylinder and the cylinder's corresponding cylinder rating.

Abstract: A method of evaluating a contribution of a cylinder to an engine includes measuring a first revolutions per minute of the engine during an enabled state; determining a dwell period of the cylinder; applying a direct current voltage signal into a negative terminal of an ignition coil of the engine during the dwell period to disable the cylinder and create a disabled state; and measuring a second revolutions per minute of the engine during the disabled state. A system for evaluating a contribution of a cylinder to an engine includes a first measure module, a determine module, an apply module, and a second measure module. The first measure module measures a first revolutions per minute of the engine during an enabled state. The determine module determines a dwell period of the cylinder. The apply module applies a direct current voltage signal into a negative terminal of an ignition coil of the engine during the dwell period to disable the cylinder and create a disabled state.