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On 21 Nov 2002, at 13:41, Todd Heimer wrote: > my '68 square, completely stock 1600, idles smoothly and runs fine through > the rpm range under no load. but when driving there is a point, about 1/4 > throttle, beyond which it sputters, coughs and has little power. The dividing > line between running great and sputtering is very well defined and > repeatable. The problem seems to be more pronounced when the engine has > warmed up. > The ignition items check out OK: plugs, points, dwell, timing. > > Where should i start looking for the problem? i.e. which FI components can be > tested with normal tools The first thing to do is realize that there are many possibilities and that the FI is just one of them. > My second question is: this car appears to have only vacuum advance, not > centrifugual advance. Is that correct? All the FI distributors have centrifugual advance. My first guess is to assume that you've actually noticed no centrifugal advance when you do the timing. If this is the case, your symptoms would be explained by a frozen (rusted together) centrifugual advance mechanism. This is pretty common and it really makes the car perform poorly. Gas mileage will be bad also. The test is to grab the rotor and twist it CW. It should move about 15 deg and then snap back smartly when released. If yours does this then this is not your problem. I normally recommend that people pay me to fix these, though, because they have to be done just right, and you may need some parts, to get everything to work correctly afterwards. I charge $50 to rebuild one, including a new set of points, major parts are extra. There is no charge to just inspect it. You pay shipping. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/