That is absolutely correct Sir!
Our efi system is called Bosch multi-point injection which is very simple - all injectors fire at the same time. There is only one driver transistor for all 4 injectors wired in parallel.
Better engineering is sequential injection where the injectors would fire 1,3,4,2.
Multi point injection sounds fancy, but basically every rev. the injectors bang a squirt into the inlet tracts and the fuel timing into the cylinders occurs when the valve opens.
At high rpm there's little to choose between simple multi-port and more complex sequential.
At lower rpms, sequential wins on fuel efficiency and emissions because the atomised injection spray is not hanging about with its fuel globules getting joined up waiting for an inlet valve to open.
A lot of jap bikes and newer Hardlys have sequential fuel injection. To implement sequential injection timing you have to have a crankshaft position sensor. I added a Hall sensor to my KRS when I pulled it apart so I could experiment with sequential firing but it would need some clever electronics sitting between BMW's ECU and the injectors to sync the timing and shorten the injector timing pulse. I just haven't had the time to do that.
Your problem is most likely the O2 sensor, the engine temperature sensor, or a TPS issue. It's far easier to pay for 1/2 hour BMW diagnostics and let them tell you what's not working than hunt for the problem yourself.
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