The performance and emission for the 4-cylinder 4-cycle gasoline engine fueled with methanol is predicted in this paper. The model for all the processes is illustrated. It computes the gas pressure, gas temperature and the rate of formation of nitric oxide and carbon monoxide at each crank angle using basic energy equation and reaction kinetic mechanism. The results are obtained at different operating conditions encompassing changes in fuel-air equivalence ratio, engine speed, spark timing and compression ratio. The special characteristics of methanol such as high power output and nitric oxide emissions have been truthfully predicted by the model.