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On 10 Apr 2003 at 9:47, jason.smith@sarcom.com wrote: > The others will correct me where I'm wrong, but I'm pretty sure the > injectors don't get 12v at their connections, I don't have the specs infront > of me but it is lower. Also, the injectors work when they are grounded by > the control unit, they have power at all times. Additionally, without being > connected to the fuel system with 30lbs of pressure, your not going to get > any results, even if connecting it to 12v operates the injector. The D-Jet injectors actually do get virtually the whole 12V, but later systems added a big resistor in series to share the voltage. The D-Jet injectors have one side grounded all the time and power is supplied when needed by the big switching transistors in the Brain. I'm not sure about the later systems. It's true that without fuel pressure you can only listen for the "tick" as the injector mechanism moves. If you see a small spark when you touch the wire to the terminal, but you don't hear the "tick" then you know that the injector is probably rusted up inside. SOMETIMES it is possible to loosen this from the outlet end and get it working again, but your odds are not good that it will ever work well. > I think you find that they can only be tested in the car. I've done pressure tests by running a hose from the pressure test point of a working engine and connecting this to an injector that I wanted to test. Use great care if doing this, because you'll be spraying gasoline and making sparks at the same time. Needless to say, don't do this indoors, or near your car. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org