This thesis is focused on vibration and noise diagnostics of a combustion engine. In the range of the current knowledge there is an analysis of measuring devices, units of measure, possibilities of frequency analysis and a combustion engine from the point of view of vibrations and noise. Part of this work is creating a technical experiment where there were measured both vibrations and noise of two combustion engines. From the data it was done a frequency analysis. Conclusion of the analysis is an evaluation of frequencies which occurred on given engines.