Abstract: An idling abutment for the controller of an injection pump of an air-compressing internal combustion engine with combustion spaces heated by means of glow plugs, with an idling quantity increase, with a movable, adjusting and spring-loaded abutment for the quantity adjustment member of the injection pump, with a pivotal adjusting lever coupled with the drive pedal and acting on the quantity adjustment member, and with an abutment lying within the pivot range of the adjusting lever; the abutment for the adjusting lever is movable by means of an expansion element within predetermined end positions whereby the expansion element is arranged within the area of a heating coil that is at least indirectly electrically connected in parallel with the glow plugs.