Begining at low temperatures and sitting all night at below 5°C my s80 starts slow. Like you see in the video below, it will start with no problem but the engine hangs at 700rpm for a few seconds and only then it will start up the electricity and revs a little harder (which should be normal from the begining).
Readings from VIDA show no errors, glow plugs were changed last year, car starts normally when warm, battery was changed last year, fuel filter 10.000km ago with OEM, EGR and throttle body cleaned. I have no slightest clue what could be wrong.
There's another problem when engine is warm (if that issue is somehow connected to this one). There's pretty noticeable rough idle when stopped and also RPMs fluctuate when coming to a stop. Interesting here is that rough idle at stop dissapears when I turn ON the AC or steer the wheels (put a load on the engine).
Volvo s80 2.4D M66 2009 (D5244T5) @360.000 km
Videos showing slow start:
https://www.youtube.com/watch?v=NIP6n9P7DSA
https://www.youtube.com/watch?v=jSIj2-B81Ts