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On 13 Nov 2001, at 21:07, shackedup wrote: > 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? You've explained it correctly. The valve would be open when cold. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org