What value bias resistor to use with a GM oil temp sensor?
 

Hi folks,
I have the GM oil temp sensor (from diyautotune) with a 3K bias resistor going in to analogue input 1 of my MS3Pro PnP in a 99 NB. I have been trying to calibrate it using hot 86 C and cold 12C water and a mercury thermometer. And am using the "GM" curve in Tuner Studio.

Trouble is, I can line up the cold end to within 1 degree, but then the hot end will be anywhere between 6 to 15 degrees out - or - I line up the hot end, but the cold end is out by 6-10 degrees.

The only thing I can think of is my bias resistor is wrong. Does anyone happen to know what the bias resistor value should be for a GM oil temp sensor?

My phone is being screwy and won't let me paste to into MT.net

On diyautotune page for the sensor it mentions in the FAQS about a three point calibration and list resistance values... not sure if that's what you need or not. Looks like a setting you have to input via TS.

2490 ohms

worked perfectly! Many thanks acedeuce