Emission controls 277 Motor vehicle pollution: sources 278 Evaporativecontrol system 278 Crankcase ventilation 281 Exhaust emissions 282 Catalytic converters 283 Engine management 284 Engine design 286 Carburettor engines: emission systems 288 Other emissionsystem devices 291 Emission standards 292 Servicing emission controls 293 Diagnosis guides 295 Technical terms 297 Review questions 297