Abstract: The specification describes an injection system with means for supplying a hot gas stream consisting mostly or totally of combustion air. The hot gas supply device comprises a heating device independent from the internal combustion engine served. The hot gas flow is heated to a temperature of at least 150.degree.C and has a mean flow rate of at least one third of the combustion air required by the internal combustion engine during idling. The hot gas flow is supplied to a zone adjacent to the opening of the injector.