Being this is a Subaru engine isn’t the idle electronically controlled? 650 rpm seems low and that could be part of the problem. The CO of .15% may indicate a "lean miss fire" condition. The HC reading 0f 87 at 2,500 rpm is also a problem. I'll bet a new catalytic converter will take care of both problems. I would do a compression and leak down test to make sure all is in order, then look for vacuum leaks or bad injectors. The should be able to check emissions pre and post the Cat to see if it is working. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Gmail
Sent: Wednesday, August 7, 2013 12:17 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Failed Emissions - High HC at Idle

Just failed UT emissions with high HC at idle. Strange thing is this is the exact set up I had before installing a different zero time rebuild due to the first using too much oil. The only difference with this new rebuild is the idle is now around 650 rpm where as the original rebuild idled at 800-900 rpm. 

I’m wondering if I adjusted the idle back up to the higher numbers it might pass. 

Idle       CO2 12.96 –  O2 3.14 –  HC 287 – CO .15
2500     CO2 14.75 –  O2 .47 –    HC 87 –   CO .21

Thanks

Scott