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On 18 Sep 2002, at 16:47, Ben Doughney wrote: > At idle (approx 850 rpm) there was no vacuum. By cracking the throttle open > just a bit (1000 rpm) it jumped to 5" Hg (120 mmHg). The highest vacuum of > 16" Hg (400 mmHg) was at 2300rpm. If I opened the throttle quickly, the gauge > flicked up to about 14" Hg and then settled back to a lower value depending > on rpm. This sounds like your vac pickoff is in the venturi where the vacuum is proportional to load, as would be useful on a vac only dist. This is NOT what the vac adv on the FI dist wants. If you use this with the FI vac advance it looks like you will get too much advance at full throttle. If you put a gauge on a FI engine you won't get any vacuum reading at all while standing still, no matter what the engine rpms. > I am not sure how helpful these are as I put the gauge on the end of the > vacuum hose, I don't know if a tee should have been used with the hose still > hooked up to the distributor? What you did was fine. > At least I have determined that there is no vacuum at idle, so I should be > able to time it with the hose still on. The easy way to tell this is to just see if disconnecting the hose at idle makes any difference. If it doesn't, it doesn't matter. It's really pretty simple once you think about it. In your position, however, I think you should leave it permanently disconnected. Just make sure your mech adv is working smoothly. OTOH, this is a long distance diagnosis, and there are plenty of uncertainties. - 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/