I experienced this in an 83 1.9 WBX.  It turned out to be a temperature
sensor sender - on the left, sort of under the a/c compressor.  I guess it
was telling the Injection that the warm engine was still cold.  Replacing it
fixed the problem, but cleaning the contact may have done the trick.

Sean

on 12/29/02 7:19 PM,  Vanagon man at vgonman@MSN.COM wrote:

> Van runs great cold, but when it gets up to temp, starts running rogh,
> stalling, and smoking black...........I am leaning towards Oxygen Sensor on
> this one...........
>
> Anyone have a vote?
>
> Adam P
> 81  Westy "The Brick "
> 70 Single Cab "Whitey"
> 74 Beetle "Ol Yeller"
> 73 Transporter (STILL at paint shop)
> 1988 Vanagon Wolfsburg
> 1976 Transporter (New CA bus)
> Used Vanagon Parts for sale (mostly aircooled)