Cylinders are fired in pairs (dual fire) - 1 and 4 together, and 2 and 3 together. It uses 2 ignition coils and no ignition distributor.
Injectors work in pairs (idle, part load), or altogether (full-load). It is a speed-density type of system, as mixture formation is dependent on RPM, TPS angle, and manifold pressure (MAP).
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Unlike the 102, 103, and early 104 series engines, the engine did not use mechanical fuel injection but the Siemens PEC/PMS (Pressure Engine Control) management system, which integrates fuel and spark management. Starting with 1996 it has a variant called the M111.921 which has a MAF (Mass Air Flow)-sensor instead of MAP-sensor on the first one, and using ECU instead of PMS. All engines in the family use a cast iron engine block and aluminum alloy cylinder head. Debuted in the 1992 Mercedes-Benz E-Class ( W124), this engine family is relatively oversquare and uses 4 valves per cylinder.
The M111 engine family is a straight-4 automobile engine from Mercedes-Benz, produced from 1992 to 2003. Motor vehicle engine Mercedes-Benz M111 engine
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