That smell could be sulfur oxide being formed in the catalytic converter.  A rich mixture will cause an increase in the formation of SO.  This often happens when driving up hills.  It also happens when the fuel air mixture is too rich.   I have also heard that if a converter goes bad this will happen.

Scot

82 D-Westy (SLOTH member)
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On Wed, 16 Jan 2002 10:55:30
 John Baker wrote:
>Anyone know what would cause a sulfur-like exhaust smell from a 1.9l waterboxer?  It kinda smells like the after burn of a match.  Running too lean????
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>Peace, JB
>'66 Split Window Camper
>'83 H20 Vanagon
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>"You cannot simultaneously work for peace and prepare for war..."
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