Abstract: An electrically operated disabling system engageable in the ignition or fuel supply support system of an automobile engine, the operation of which is under control of a master control switch for the ignition system, said disabling system includes a normally closed relay switch related to one of the support systems to disable that support system and cause the engine to stop operation when said relay switch is opened, an electrically operated time delay switching device under control of the master control switch and operating to cause the relay switch to open and disable its related support system after operation of the engine for a limited predetermined period of time; and a normally operable on and off switch to selectively put the disabling system into and out of service.