Hello everyone, thank you for accepting me into the group.
I wanted to show you a problem that occurred in my car.
The car is an Xf 250 2.0T. I recently replaced the timing chain, there were no problems before, but the car already has 145K miles, so I decided it was time. After the replacement, I noticed that when the car stops, the revolutions are uneven for a while and fluctuate. Once P0505 appeared (problem with idle speed regulation), after clearing the error, the revolutions continue to fluctuate. I read that it may be a charging problem, but I measured the batteries and the values ​​are OK, I noticed that when I stop and turn off the radio, ventilation and lights, the rpm stops fluctuating.
From the things I've already done.
I measured the batteries
I checked the air hoses and the vacuum pressure is ok.
Do you have any suggestions?

 

Camshaft timing? (Not sure if the camshaft sprokets have timing adjustments though. I never changed chain on 2.0T)