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<x-charset Windows-1252>I can't find an explanation of the heat riser system in any of my books. Am I right to assume that it is essentially a small exhaust tube that runs alongside the intake manifold and empties into the main exhaust flow? How does the butterfly valve work... Closed when warm or closed when cool? Is it true that a plugged heat riser can cause hesitation and even engine damage? Thanks Andre ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/ </x-charset>