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This paper reports on the results of using multipoint port injection alcohol fumigation of a four-cycle turbocharged diesel engine in which the fumigation injection cycle was varied. The three cycles, dual with one-half of the alcohol injection on each engine revolution (DIT), single with all of the alcohol injected during the open intake valve revolution (SIO), and single with all of the alcohol injected during the closed intake valve revolution (SIC), lead to significant differences in the engines pressure-volume history and alcohol energy replacement tolerance. The engine was fumigated with both industrial grade ethanol and methanol and complete performance and emissions data (excluding aldehydes) were measured at low, medium, and high values of BMEP and rpm. The results help to explain recently published data showing limited energy replacement, apparent excessive rate of cylinder pressure change, and emissions for single point injection in the same engine.