Have you checked the fuel pressure while the problem occurs? Excessive
fuel might kill the cat and O2 sensor. Maybe your pressure regulator has
died. Getting to be a common failure.

Mark

Vanagon man wrote:
>
> Volks,
>
> swapped air flow meters, same result.  When I hook up the oxygen sensor the van runs crappy and the values are negative.  With it disconnected the van runs pretty decent.
>
> This was a 4 month old Bus depot sensor..the kind you have to splice.   I believe it probably fried when my catalytic converter bit the dust.  Anyway, I would like to find the sensor with the correct plug ins other than the dealer.  More than one listee has told me that the splice has failed on them do to water, etc.  I am sitting down, and know it will not be cheap.  Let me have it!
> Adam P
>
> 81 Vanagon Westy (The Brick)
> 70 Single Cab "Whitey"
> 74 Beetle "Ol Yeller"
> 73 Transporter (STILL at paint shop)
> 1988 Vanagon Wolfsburg
> Used Vanagon Parts for sale (mostly aircooled)