THanks for reply.

I already tried that with no resault.
I also messured the contact at the old switch and it worked fine.

But what i noticed is, i compared my car to another one with the same engine and with the ASR system.
His electrical engine that is located under the aluminium inlet manifold was deffently working as you could hear the engine run as the gas pedal was pushed (ignition ON, Engine OFF), mine is dead silent and is not moving at all, leaving the linkage to adjust the throtle, but this is only working if I remove the linkage that is attached to the electronic device i mentioned is attatced under the inlet manifold, othervice it holds against the throtle pedal and i canīt give it some gas to rev up the engine.
without this linkage i am also able to se "if" the electronic device is acturely moving the linkage, but it is dead silent and not moving

Im almost sure it is this electronic throtle actuator i think itīs named on the later model, but haw can i check that for sure before bying antoher expensive part?
And does anyone know the Part number for this M104890 EA device?
Anyone even know the M104890 model 300-24 ? and the ASR system that this engine is equiped with?
It is deffently different to the later M104 280/320 engine ASR system.

Best regards from my to you