Possibly, you will always get some that work fine without issue, however I have seen a LOT of Ford pulley failures over the years, it could well be slight over-tensioning causing that, but the Camry idler won't break no matter what tension you put on it.
![](./images/smilies/spacer.gif)
Basically it's a crap plastic part that's just not fit for purpose in my opinion, I feel much better about having a factory all metal Toyota idler on there and we've seen zero failures since inventing that upgrade.
![](./images/smilies/spacer.gif)