In 1998, the BT 5.9 was redesigned as a 24 valve engine to update emission requirements. ISB stands for Interact System B. The ISB featured a Bosch VP44 rotary injection pump until 2003, when the injection system was upgraded to a Bosch high pressure common rail fuel injection system, which increased power output.
In 2001, a high output (HO) version of the ISB became available, which slightly increased the output of manual transmission equipped trucks. A 610 version of the ISB became available which pushed torque to 610 lb-ft. Well known for its low speed torque, the Cummins 5.9 ISB has an advantage over V8 diesel engines in the light duty truck market.
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