The following article discuss on L-Jetronic Fuel Injection Systems for BMW E12 which covers following topics: Basic Engine Combustion Process, Combustion Requirements, Fuel Delivery Implementations, Electronic Fuel Injection System Components, L-Jetronic System, The L-Jetronic System – Control Unit (ECU) takes sensor information such as AFM flow and temperature, Engine RPM (from ignition), Warm up information (from coolant temperature sensor), Throttle mode (idle and WOT switches), O2 sensor in Lambda systems.