The emission reduction techniques include running the engine by mixing of FeCl3 as metal based catalyst with diesel, steam injection technique and diethyl ether in the fuel mix, with the engine running in the single as well as combined mode. The different combinations such as diesel with FeCl3 as catalyst, diesel with steam injection, diesel with FeCl3 and steam injection combinations, diesel with diethyl ether and finally diesel with diethyl ether with steam injection mode are tested and reported. The following overall conclusions are drawn from the experimental observations: Diesel+FeCl3 combinations as a fuel mixture in the CI engine resulted in an improvement of the brake thermal efficiency (BTE) of the engine by 4% with a reduction in the brake specific fuel consumption (BSFC) up to 6% compared to the case when the engine is fuelled by diesel. Additions of FeCl3 to diesel result in a high cylinder gas peak pressure and temperature.