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Needing some help here. My 92 LT1 car developed a over temp issue on the instrument clusters screen. Example, it will show 110 degrees at startup and hit 220-250 within 2-3 minutes tops. The analog gauge stays around 160'ish, probably not able to get any higher as the fans stay on at all times due to the screens temp reading is what communicates with the PCM. I've even started the car and it shows 240 at startup on the screen.
So, I went to checking some things. First thing I did was unplug the temp sensor in the water pump, when I did the temp on the screen instantly dropped like 100 degrees. So I hip shot guessed and threw a sensor(AC DELCO) at it. No change with sensor swap. lol
With sensor unplugged it was getting 4.20v on the sensor connector and where it was coming out of ECM also. 0 resistance in the circuit between the ECM and the sensor connector. Quick checked the sensor connectors ground at connector, seemed good, ground was good enough to use as a ground to check power on another circuit with.
Like stated, the 4.20v was with the sensor unplugged. With sensor plugged in was 2v coming from ECM at the sensor connector when I back probed it. Temps on screen went from 106 at startup to 177 in 1 minute of running that time/average.
I have been having a similar issue on my 96'. The analog gauge is always correct. The digital gauge will erratically show Hi Temp 268 or something like that. Havnt dug into it. Have you messed with the sensor in the head to see what happens?
Only thing I've done with the head temp sensor is unplug it and see if any screen changes. No change to screen temp, my understanding is the temp sensor in the head is the one for the analog gauge.
Try to unplug the Temperature Sensor on the water pump and instead connect several different values of resistors according to the chart below. The values of the resistors in the chart should get you an approximate Temperature reading on the Cluster. If you find that the Temperature readings with the resistors match the chart then you know you have a Sensor issue.
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Help!! LT1 temp sensor issues
