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Oops. Sorry that was a typo. You are quite right. Resistance decreases as temp increases.
Anywho, last night I tested the coolant temp sensor on a cold engine and it read 2240 (within specs according to the Green book factory manual). I reconnected the plug and went to pin #2 on the ECU and it also read 2240. If there was a short in the circuitry, I would not have gotten the correct reading at pin #2. So the theory about a bare wire unfortunately is not the problem. I even wiggled the wires all the way from the ECT to the ECU and no fluctuations in the readings. I also checked ground at pins 11 and 25 (direct connections to the grounds on the manifold) and all was well. On the surface, all seems to be well in the coolant temp sensor department. Yet still the car won't accelerate when cold unless it is disconnected.
So now what? If the ECU is getting the correct signal from the ECT could another component be sending erroneous info to the ECU causing it to run lean and pop during cold running? Perhaps the AMM has a wiring issue. Like I said, I don't think it's in the ECU itself because I swapped it out with a good working one.
I suppose I will have to run through all of the diagnostic tests one by one as outlined in the GReen book and see if I find anything out of whack.
Anyone got any other ideas?
Thanks, Tony
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