As to the O2 closed loop mode discussion, I'm not sure it really matters
how often a closed loop system cycles.  What I'm interested in list
members understanding that adjusting the fuel injection system is done
open loop.  It is important that the o2 functions, but it just seems to
me that people rely on the o2 to control the fuel mixture and forget
that the basic fuel mixture should be set correctly first.

When I hear comments about the crossover being too fast, it makes me
wonder what the basic fuel mixture is. I was working on our 88 Sunbird
and the fast crossover  is listed as a possible fault with the basic
fuel injection pulse.  The sentence went something like, if the
crossover speed is excessively fast, verify basic fuel injection
mixture.  I believe this scenario is a possibility on the Vanagon too.

Anothor possiblity is the difference in how the Different ECU's operate.

Sincerely,

Mark Keller
91 Carat