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On 7 Jul 2003 at 20:01, Daniel Baum wrote: > My engine seems to run quite well (starts perfectly, stable idle etc), > except that it appears to run > extremely rich at high rpm. When I drive it, it bogs down on hills, > and when stationary in neutral it billows clouds of black smoke when I turn > the throttle. What > should I be looking for, could it be a maladjusted accelerator pump? > or possibly something to do with timing and the mechanical advance on > my distributor? > > The car is an automatic with stock dual carbs, for those of you unfamiliar > with it. If it has good power when you drive it, then the mech adv is probably fine. If it runs rich all the time the throttle is open then this doesn't sound like the accelerator pump, which could make it be rich for that moment that the throttle is actually opening. Black smoke is often just carbon dislodged from the engine/exhaust when you get more flow thru there, so it's possible that the problem is actually too rich a mixture at idle. It's also possible that you just haven't had a chance to blow all the old carbon and rust out of there yet and maybe you've actually got everything working right. Otherwise, I'd suggest that you check your jet sizes and make sure that nothing has unscrewed itself since the last time you were in there. I assume you've already rebuilt these carbs and that the chokes are working. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org