What are the major systems of a car?

Mechanical: Engine/Motor, Axle Housing and Axles, Differential, Transmission, Chassis, Body, Seats, Steering, Suspension, Tires/Wheels, etc ......

Electrical: Wiring, Fusing, Lights, Relays, Sensors, Battery, Alternator, etc ........

Fuel: Fuel Pump(s), Hard Lines, Hoses, Fittings, Fuel Rail, Fuel Injectors, Pressure Regulator(s), etc.....

Air: Intake Manifold, Plenum, Thottle Body, Air Filter, Air Ducting, etc......

Spark: Ignition Coils, Spark Plugs, Spark Plug Wires

Computer Control: Monitors Engine Crankshaft Speed, O2 Sensor output, Intake air temperature and varies the spark duration and timing, as well as the fuel injector pulse width and timing to insure the engine runs optimally. The computer also monitors other sensors and will notify the driver of any discrepancies that are detected during operation.

TommyTrouble (Infinitum@cox.net)