The content of toxic components in exhaust gases (CO, CH, NOx) limited to a combination of vehicle engine design features and special controls in the fuel system.
Features of the shape of the combustion chamber, intake manifold, gas distribution mechanism and ignition system form the main control system. Additional control devices include a catalytic converter and oxygen sensors that monitor the composition of the fuel-air mixture.
The elements listed above are integrated into an overall very efficient control system that controls the level of toxicity of exhaust gases and provides acceptable vehicle handling and good fuel economy.