I am still trying to track down the rich running condition on my 90
Westfalia. I thought that the problem may have been related to the ground path
and have cleaned up the two ground points under the coil and have moved
another  ground connection from the coolant tower previously to a better contact
point. I  also replaced a connection for the green wire that attaches to the
positive side  of the coil. No change. I also put together the test wiring
harness discussed in  a previous thread from the article on the Samba. No
changes with the problem  with the harness in place. I also tried shutting off
and then restarting the  engine with the engine running to test the o2
sensor per Dennis' suggestion.  This did correct the problem for a few seconds. I
then disconnected the o2  sensor and still had the problem so I think this
rules out the sensor. I had  previously found the correct voltage coming off
of the sensor (.1-.7 volts). The  temp II sensor has been replaced and I
have checked the wires to the sensor. I  am going to check the throttle switch
to see if any problems are evident here  tomorrow. I also am going to use
probe pins to try and check for voltages at the  computer from the temp I,
temp II and AFM. Any other suggestions from the list  to check on this
problem? The problem was an intermittent rich running problem  and now seems to be
almost constant. Thanks gurus.

David Clarkson
90 Westy
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