Automobiles 961 Motors 909 Maintenance and repair 209 Performance 141 Exhaust gas 103 Design and construction 98 Cooling systems 88 Fuel injection systems 86 Modification 77 Internal combustion engines 64 Computer control systems 62 Control systems 61 Exhaust systems 59 Fuel systems 40 Motors (Diesel) 38 Motor vehicles 37 Radiators 37 Combustion 35 Examinations 35 Testing 33 Electronic equipment 32 Pollution control devices 30 Motor 29 Spark ignition engines 28 Measurement 26 Turbochargers 26 Examinations, questions, etc 21 Automotive sensors 18 Electric equipment 18 Engines 18