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Hi, Well here's where I am now. There is no cold start valve, etc. Checked the diaphragm in the pressure sensor (actually manifold vaccum sensor) and it seems like no leak. Checked the Temp Sensor I and Temp sensor II, they read 3.4K and 630 ohm at 35F ambient. Cleaned all connectors on the engine with Corrosion X, a miracle corrosion cleaner. Reconnected the two temp sensors. Started engine again. Started right up this time. seemed a little rich, let it warm up to see if it was cold enrichment. When warm the motor idled very well, with no black smoke. If I would get in the throttle to rev it up, the exhaust would blacken, and do an overich backfire now and then. While at fast idle, I pulled the hose off the pressure sensor and the engine immediately went very rich, black smoke like when we ran it before. I pulled the connector off the pressure switch, no change. Pulled the connector off the throttle switch, no change. With the engine off I can hear the throttle switch click like it is suppose to when you move it off the stop. I studied the Bentley manual last night. I understand fuel injection fairly well, as I have a plane I built with a two stroke fuel injected Hirth (german) engine in it. I have modified that motor quite a bit and have completely reprogrammed the ECU (control module) to work with my mods. It seems to me now that on this Squareback, that I basically checked everything and it's working or not affecting (pressure sw., throttle sw.) normal running. The electrical connections were probly not up to snuff. The only thing left to my inexperienced way of thinking at this point would be the fuel pressure regulator. I don't think it's ever been changed and it seems to me it could be off after 36 years. The fuel pump has been changed. If it were regulating fuel pressure to some higher level, all running ranges would be rich. However, what do you think? I am so happy that this is working out. Thanks for your help. Aren't news groups just the most amazing thing? Jim Showker ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~