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On 21 Jul 98 at 11:51, T. A. Dapper wrote: > I suggest that you get your VW on the road, run the engine up to > about 3500 rpm in second gear, leave the clutch engaged and back off > of the throttle - then measure to see if there is any excess fuel in > the exhaust system. This test works best with carburetor systems. Of course, this is the classic backfire-causing situation. Backing off on the throttle pumps the exhaust full of gas/air mix, none of which burned in the combustion chambers because the fuel/air ratio was wrong (just a natural problem with carbs.) Then set a match to it when the you depress the throttle again and get one good power stroke that dumps a flame front out the exhaust port as the valve opens. There's no mystery here, and no need for exhaust leaks. It will happen in a perfectly sealed system because the air was pumped through the engine with the gas. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA *******************************