Awd problem

[adamek125]

Hello, maybe its a lame question, but i have a problem with my 92 awd tsi. When the car ( as all components i mean ) is cold it seems that it's only fwd, I have just finished some mods, and we tried to dyno the car, at first the dyno didn't recognized it as awd, because the speed between the axles was much different, when the car got warmed up enough to be checked, it was normally awd, any ideas? WTF

p.s.
-The dyno IS awd
-no mods done to driveshaft/axles/tranny etc.

 

[->PrOjEcTGS<-]

Could be the Viscous Coupler going out...

 

[adamek125]

Any chance of reanimation the old one? or replace the whole thing? i don't have the car "with me" right now so i have no clue how and what might be broken...