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Elaborating on what others have already said above, the injection is continuous on all cylinders at the same time all the time. The fuel pressure and volume control how much fuel is being injected at any given time determined by the metering plate in the intake stream ahead of the throttle plate.
The injectors pulse based on the fuel pressure similar to a diesel injector, but at a much lower pressure. The idea being that they "buzz" and create a "fog" of fuel at the intake port. When the port opens, the "fog" is sucked in and mixed with the intake air, then compressed and burned like any other "port-injection" fuel-injection engine.
It's a clever system, but very complicated and difficult to troubleshoot if you aren't familiar with it. When it works properly, it works GREAT. When it has a problem - people have sold and scrapped cars after getting fed up trying to fix them!
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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