Xg, Follow my instructions from this link of 18 months ago. If you have an early H2 this may solve it. The "plastic chain" can sometimes get of the cam gear. and that may involve a little more.
http://elcova.com/groupee/forums?a=tpc&s=2826088551&f=5106011751&m=697601368 1&r=4726054681#4726054681