Hi, I have an interesting one.
I have an 09 Galaxy, 2.0TDCi, 80K miles. Had no.3 injector done recently.
The car has a vibration when idling and makes a slight knocking sound when the clutch is down. Knocking goes away when clutch is up and there's some drag from the gearbox. Clutch pedal feels normal, no vibration or pulsing. My guess based on that was DMF.
Lift the revs a little and the vibration goes away. Car goes fine, sounds fine at speed (40mph+). However, pootling about at 20-30mph, at low revs, things don't quite sound 100%, and if I lift and coast there's a rubbing/grinding noise which seems to come from the front near-side (gearbox end), which goes away if I push the clutch in or if I re-apply the throttle.
I think it makes the same noise just as I apply the throttle also (at low speeds), but goes quickly.
Any ideas' what might be going on?