Engine is not running rich if a good O2 sensor is showing .5 volt. Rich
smell can be caused by an ignition miss-fire or a bad valve condition.
Do a leak down-compression test and a tune up if indicated.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
Of George Averill
Sent: Sunday, August 04, 2002 9:37 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Engine running rich

Another problem.  Engine is running rich.  Carbon noticeable on exhaust
pipe.  Ox Sensor registers 0.52v with hot engine.  Exhaust smells of
fuel.  Slight stumble when idling, but none when speeded up.
Anyone have a suggestion?