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On 6 May 2004 at 4:29, type3@comcast.net wrote: > OK FI gurus out there - updated info: > > 1. new cylinder head temp sensor > 2. new air intake temp sensor > 3. new voltage reg - bosch 30-019 > 4. new bosch generator. > 5. disasembled and cleaned the aux air regulator - again. Hmmm, I hate to be critical, but it sounds like you're taking the path of just replacing anything that might be responsible. This approach will get VERY expensive. For most of these problem areas there are simple tests which can pinpoint or eliminate them as possibilities, while just replacing parts may NOT cure the problem, because the problem can also be in something like the wiring harness that connects to that part. So even if you replace the parts, you still need to do the tests afterwards to verify that the problem has been cured. > Pulled a couple plugs (bosch W8AC) installed 3 weeks ago when all this shit started - plugs are black and sooty. Exhaust smells like it's running rich. > Pulled air hose off aux air regulator and the additional air does in fact > raise the RPM when egine is cold. However this thing behaves the same way > when warm. Pulling the UPPER hose off the AAR should have no effect at any temp; if it does, then the hose is plugged. Pulling the lower hose off the AAR should make the engine race at any temp. > I took Dave's advice and submerged it in hot water and it does in fact > tighten down when hot and close off air flow. What I'm still stumped on is > the fact that the aux air reg seems fairly closed even when at room temp - > which is when it should be more open. Have not found any documentation on > what the little + and - signs mean on the little spring. It is normal for it to be mostly closed at room temp. It will be mostly open when it gets well below freezing. Unlike the engine cooling thermostat, the AAR does not open/close all at one temp; it closes slowly over a rather wide temp range as the engine warms up. The +/- indicates which direction you should shift it to adjust exactly where that range falls. You can think of the AAR as an automatic throttle which keeps the engine from dying when it is extremely cold and the sluggish oil in it tends to slow it down. I don't think the AAR has anything to do with any problem you could be experiencing at 50F or above. You need to move your focus elsewhere. > Aside from the aux air reg...i'm concerned about the black plugs and not so > great fuel economy. What other components tell the computer how to handle > fuel mixture? Seems like i've hit just about everything. Yes, this is your problem. Check the charging system regulating voltage. Make sure the pressure sensor hose is attached at both ends. If this is a 70-1, then make sure the pressure sensor holds vacuum if you suck on it. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org