Cold extrude? As in when calibrating the extruder feed?
If the gear rotates and nothing is being fed, most likely the spring tension is incorrect, the feed gear is clogged with shavings, or the lever is bound up.
There isn't an adjustment for tension that I know of, however when I was still running the stock extruder I found that it was possible to tighten the lever pivot to the point where it would bind.
Try loosening it a little (the upper right-hand bolt as viewed from the front of the extruder).
Just a thought.
I moved on to an E3D Titan long ago and never looked back.
It is quite adjustable and so far has been reliable aside from some minor issues.
I second that too. Look for anything that could bind.