P4 - odd noises and vibration (coupling?)
Last night the P4 started vibrating at low speed, and making strange almost metallic noises whilst turning on hard-lock. I'm worried this is a problem with the viscous coupling maybe seizing up or something like that. Earlier in the day I grounded the car on a speed bump, but I think that only touched the exhaust so may be unrelated???
Anyone had this happen before, what would the symptoms of a knackered coupling be?
Or any other possible causes you can think of please?