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It amazes me that so many of us out there actually get involved in these little puzzles.
Your reply is accurate. The 2250 ohms at cold start signals the ECU to provide more fuel. As the temp increases the ohms go to 350 and the ECU sends a signal to lean out the mixture.
As I have stated in the prior posts, the ECU seems to be getting the 2250 ohm reading at pin#2 (no wiring problems at least in the ECT circuitry) but it is still not sending a signal to the injectors to richen up the fuel mixture. I'm sure the problem is lean running because there is an occasional pop at the air box (a common indicator of a lean condition as I've read).
Regarding the other post from machine man to swap out the harness, I have done that on another car and it can take a good deal of time to pull one and then replace this one. This harness is not brittle. I have seen bad harnesses in which the insulation cracks when bent. This one is surprisingly flexible with no bare wires even down by the alternator where they seem to fray and split first. Of course, this does not mean the harness is good but I think it would be more productive for me to run through the step by step wiring tests as outlined in the factory manual before I replace the harness.
The electrical diagnosis shouldn't take more than an hour to check every component in the system. This weekend is reserved for that. If nothing else it will give me a more in depth understanding of what is going on.
I'll post my findings Monday. Thanks again for eveyones continuing interest.
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