Abstract: There is provided an engine test method whereby the engine involved is started and the systems thereof are regulated so as to obtain steady running, whereupon, by controlling fuel feed, a running-in process is performed by repeatedly carrying out runup-rundown cycles. In every running-in cycle, beginning with the first one, at least one of the parameters, for example, the acceleration of rundown, is measured and analyzed for the purpose of assessing the technical condition of the engine on which basis the parameters of the next running-in cycle are selected, the running-in process being ended at the instant when the engine reaches the predetermined technical condition.