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Subject:Re: 1991 Vanagon sputters and blows black smoke on highway.
From:Jere Hawn
Date:Wed, 2 Jul 2003 21:15:01 -0700

Hi All,

The below method is a perfect way to check if the problem is the O2 sensor,
but do this check while you are experiencing the problem.  The other way to
reset the computer is to floor-it; this will also cut out the O2 sensor from
the computer and the problem will go away until you let off.  If you use the
first method you can get up to a few miles before the problem kicks back in,
provided the problem is the O2 sensor.

Jere
90 GL
88 GL