Hello, i have the following issue with my 500E, which reminds me closely at my friends E420 years ago, which had the similar symptoms and it was a broken alternator.
When my car is at idle and i switch from P or N into any gear, RPM goes down to ~500 and lights inside + outside getting much much darker.
As soon as i press the pedal, the opposite happens -> immediate brighter lights inside and outside clearly noticable. This is my first indication.
My car has no false air leaks at the new engine, everything was thoroughly tested with mass amounts of brake cleaner, but still as soon as i roll to a stop with "D" still engaged, engine drops to SUB-500RPM!!!, then starts to surge 50RPM up/down for around 5 seconds and then holds itself at 500RPM.
When i have many electrical consumers activated like seat heating, lights and heating ventilation and i do a quick stop with the car, for instance while in a curve or while driving around a corner and suddenly there is a car/kid/whatever up front, the engine suddenly stops. RPMs simply going to much below 500RPM and one little surge is then enough to stop it.
And i think i know why this happens. The injection duration is learned by the ECU based on Voltage. The higher the Voltage, the shorter the duration/duty-cycle of the injectors.
I have replaced the voltage regulator provident, while the engine was being assembled still, with a 14.7V Beru regulator. But it seems that this didn't help.
So do you agree that my alternator is broken.
Upgrade possiblities to 150A versions? People in german forums claimed that the ones from W210 V8s or Diesels would be fitting and here i learned that there is one from the ML class (BOSCH-Nr: 0 123 520 012) that would fit.
Thanks alot.
When my car is at idle and i switch from P or N into any gear, RPM goes down to ~500 and lights inside + outside getting much much darker.
As soon as i press the pedal, the opposite happens -> immediate brighter lights inside and outside clearly noticable. This is my first indication.
My car has no false air leaks at the new engine, everything was thoroughly tested with mass amounts of brake cleaner, but still as soon as i roll to a stop with "D" still engaged, engine drops to SUB-500RPM!!!, then starts to surge 50RPM up/down for around 5 seconds and then holds itself at 500RPM.
When i have many electrical consumers activated like seat heating, lights and heating ventilation and i do a quick stop with the car, for instance while in a curve or while driving around a corner and suddenly there is a car/kid/whatever up front, the engine suddenly stops. RPMs simply going to much below 500RPM and one little surge is then enough to stop it.
And i think i know why this happens. The injection duration is learned by the ECU based on Voltage. The higher the Voltage, the shorter the duration/duty-cycle of the injectors.
I have replaced the voltage regulator provident, while the engine was being assembled still, with a 14.7V Beru regulator. But it seems that this didn't help.
So do you agree that my alternator is broken.
Upgrade possiblities to 150A versions? People in german forums claimed that the ones from W210 V8s or Diesels would be fitting and here i learned that there is one from the ML class (BOSCH-Nr: 0 123 520 012) that would fit.
Thanks alot.
