My 533i has 200 thousands km. And ran flawlessly until last week, when it began. It is now worst. If the car is running on the highway, I would feel a stumble for one second, and the car would keep on running. When at idle in traffic the other day, it would simply quit. I had to crank 6 times to get the motor running. At every crank it would run one second on the cold start injector.
On the older 5 serie there was a combi-relay that would affect ignition and injection. Is there such a ting on that 533?