Big scale construction machinery is absolutely necessary for the mineral resources development and various construction works. Troubles of the machinery give serious losses in the efficiency of operations and also in financial proceeds. From a practical point of view, we employed a wavelet transform with Gabor function as a window and analyzed the acceleration wave curves data to detect a misfiring cylinder from the multi-cylinders diesel engine. The results by wavelet analysis revealed that the misfiring cylinder could be detected visually in time-frequency maps. With the aid of statistical analysis using rms value, the misfiring cylinder of multi-cylinders diesel engine can, therefore, be doubly checked by wavelet analysis.