I got myself a 2009 HHR with a bad LE9. From what I could gather, the only differences between it and the LE5 are injectors and the ecm, and possibly the valve material. Is it possible then just to use the injectors/ecm on the bad motor and swap them over?

 

They will fit, the camshafts are different, so you might consider swapping those also.

 

And a new timing set.

 

Is the timing set different or is it just as a precaution?

 

A precaution, the timing sets are the same, for the LE5 or LE9 , the Cloyes 9-4201SA doesn’t include the VVT actuators, the 9-4202S kit has the complete balance shaft chain kit guides and tensioner.
I highly recommend an upper front guide replacement bolt from Melling or Dorman, both work great.

This is a great link to check out, and instructions to assemble the chains

http://www.ddmworks.com/assets/image...uild%20Kit.pdf