Ok thanks for the above post! Very helpful. I have quite a few years working on FI cars and especially the BOSCH systems, but all in BMW's and this is my first Z car. I did run through the checks today with a DVM and the big glaring problem was the "Thermotime Switch" on page 19 of the EFI book. It was supposed to have 740-940 Ohm resistance at the coolant temp today and it was around the six mega-ohm range. However, when I tried to get this part at the local parts store, then only had one thing listed as a "coolant temp switch". Now the diagram shows shows three different sensors screwed into the thermostat housing on this 78 280. One I take it the "Thermotime switch" than controls the cold start system, the other two I don't know. Any ideas? I have a picture of the one I purchased today, but can't seen to figure out how to upload to this site. I also have some screen captures of the tech manuals, but the same problem. Cheers,