What's up everyone! I'm trying to figure out this issue I'm having on my 08 TL 3.2, I'd post videos but I'm a newbie and don't know how.

I just replaced the timing belt and ran it without the accessory belt to verify proper running
before I put it back together and it ran fine, no codes or misfire. When I put the accessory belt
back on it runs very rough and ended up throwing a PO389. Now the car is back together, I can go back and
forth removing the belt and the symptoms are the same. All pulleys spin fine and I have verified proper belt
routing time and time again.

Any help I can get with this would be greatly appreciated!

 

Maybe revisit and recheck timing and connection to the crank sensor if it was unplugged?
P0389 - Acura Diagnostic Trouble Code (DTC) Definition, Causes and Diagnosis (dtcdecode.com)

 

It's possible but could that explain the symptom of the running rough/running good with the belt going on and off?

 

is it possible the crankshaft got rotated by 1 tooth while installing the timing belt? I hate to say that! lots of work to check