As commonly known during the operation of technical facilities their property operating parameters are changed, this also applies to internal combustion engines. It is connected with the influence of working and external factors on the internal combustion engine. In order for a technical device powered by an internal combustion engine to be able to perform the given utility functions, the internal combustion engine must undertake an independent operation. This article presents selected results of tests of the diesel engine start-up process. The results of the impact of fuel injection parameters (fuel dose) on selected parameters of the diesel engine start-up process are presented.