The colder it gets the greater the value of resister used to measure the temperature that sends a signal to the ECU. so to increase the resistance by adding 100 ohms tells the ECU that it is colder than it really is. I guess the ECU enriches the mixture for colder temperatures I believe which is where we felt we should be. Wildly increasing or decresing the resistance could make the ECU believe that the thermistor is faulty and shut the system down. You just have to play and see.
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