Originally Posted by
avguy
I can't discuss any specific timing procedural aspects, because I've only done belts on my '05 and '06. The '09 uses a different set of part numbers, and so I don't want suggest something that may be wrong for an '09.
But I will ask did you replaced all 4 timing belt components? From many prior posts, it's been fairly well established that these timing failures are typically caused by component pulley or bearing failures, or installation errors, rather than the belt itself failing. So if there is still an old pulley or the WP in the mix, that might explain what's happening with this Aveo.