if it is changing and going down is a good sign it's working. Then idle up the temperature and turn off the car and go unplug it measure the resistance when hot. To check it you can go out with a multimeter and un plug ECT measure the resistance across the two pins when cold. The net effect is that the ECM voltage reading off the ECT will be higher when the resistance is high when temperature is cold, and will go down as temperature increases because the ECT resistance is dropping. It is a common technique can be looked up all over google. The type circuit the ECM uses to read this resistance is called a voltage divider. when the temperature is cold the resistance will be high, and when the temperature gets hotter the resistance will go down. The ECT is just a type resistor called a thermistor who's resistance changes with calibrated accuracy as temperature changes. If you want to check the ECT you can do it without the scanner. Any one have a idea if it could cause any of the problems im having? I had to replace it with a cheap parts store brand and now for the life of me cannot remember if it idled correctly before i replaced it. I had to replace it when I did my intake gaskets due to breaking it when i was torqueing the bolt by in down. I don't know if its a none readable sensor on obd1 or not. Does it also control when the engine goes into and comes out of high idle? Also I cannot read that sensors reading with a scanner. I know it sends a temp signal to the ecm for timing adjusments, how much fuel to add. Cap and rotor are in good shape and show no signs of carbon build up on the contacts and i don't see any cracks. Also when first starting it before it idles up its idles like a high horse power drag car. This one runs about 800 rpm then picks up to around 1200 after 3-5 mon. Every other EFI engine Ive had when you start it when its cold it will idle around 1200ish rpm. When the ambient temp is low roughly 20 f or lower it has to run for roughly 3-5 minutes before it will go into high idle. Im having some cold starting issues with my 95 2500 5.7.
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