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I am stumped. I have a 72 Squareback built in June 72 but the wiring harness and FI match the diagrams for August 72 and later. There is a plug next to the pressure sensor with 2 wires numbered 41 and 42. they don't show in any wiring diagrams I can find, including the Bentley manual. I think it may be associated with my FI. A FI manual I have (plus additional book) indicate the August 72 (and later), plus 73 ECU 311-906-021E (black color code) were built with a potentiometer on the ECU to adjust CO admissions. Sounded like a great deal to me then I checked my ECU. The ECU has the correct PN (no black marking?) but no CO potentiometer on the outside. Since my car seamed to be built during the gray area of a production year (model year shift), I turned to the INTERNET found a good FI troubleshooting site http://www.estinc.com/porsche/djet.html and low and behold I found that some of the late 72's were built with the potentiometer next to the pressure sensor http://www.geocities.com/MotorCity/Shop/4123/Potent.html (PN 311 906 019). Here's the mystery I think my car was one of them, but was it? If not what are those two wires for? For the electronically gifted there is an excellent site for the ECU dissection http://members.rennlist.com/pbanders/ecu.htm (pictures and schematics). I am off to look at some 72 and 73 type-3's at the local wrecking yard. I would be eternally grateful for any leads. Jim ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/