Hi
Have 2009 Volvo V50 with 2.0D D4204T engine and MPS6 transmission (Getrag DSG) in with oscillating rpm problem.
It starts fine even with -20C, idles great but when driving then rpm oscillate. Best felt in about 45 km/h at about 1500 rpm.
When speed rises then it's not be felt much anymore at 90 km/h. But about 60 km/h and 1800 rpm still present enough.
It had engine rebulilt few years ago. Then there was DPF problem tha got resolved. Lately EGR was replaced because it was faulty.
Took quick measurement and noticed that cylinder 2 is doing less work. It could not been felt when driving. Removed injectors and got them checked. #2 was faulty indeed. Others were within spec apart from preinjection for two other injectors. Preinjection was almost missing. Owner authorized replacement for one injector.
Replaced injector, reset adaptations and did another test. Cylinder 2 was now firing but no change in oscillation. Didn't think it would change though.
Will try to get this car in next week for more test. Did quick test and unplugged EGR and it gave no change.
Any suggestions?