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Five idle-mode firings of the Rocketdyne J-2S rocket engine (S/N J- 112-1A) were conducted in Test Cell J-4 of the Large Rocket Facility on April 17 and 24, 1969. These firings were accomplished at pressure altitudes of approximately 100,000 ft at engine start. The objectives were: (1) to investigate engine idle-mode operating characteristics with a redesigned injector (oxidizer idle-mode compartment consisted of the injector posts in the tenth row from the center of the injector); (2) to determine fuel injection density for varying pump inlet pressures; and (3) to determine engine idle-mode performance. The lowest injection density was 0.055 lbm/cu. ft. with the thrust chamber bypass valve closed. Engine average characteristic velocity for this injector configuration was about 2.6 percent greater than that recorded during tests with the previous injector.