Re: Water Temp Sending unit
As said, the ECM unit should be left alone. In OE set-ups: The fan switch is on the pass cyl head. The cold start inj power comes from the Bosch thermo switch just below the thermostat housing, and its on for approx 8 seconds. After timeout, it stays open until coolant is below 68*F.
Battery power to one terminal of Bosch sw, the other terminal to the inj, then other inj terminal to ground. Look at an engine wiring diagram to make sure, I'm going from memory when I had one, 85 Z/28, 4 yrs ago.
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