Temp sensors reading warm.

[classic-indy]

I've calibrated my standard GM CLT and IAT sensors in tunerstudio, but they seem to be reading 5 degs warm!!! When I had calibrated them in Megatune before switching programs they were reading accurately. All other sensors seem to be unaffected. What is the proper way of dealing with this?

I have been thinking of removing the sensors and getting 3 resistances at 3 different temps, But they are standard GM sensors so I'm unsure of why I'm experiencing this problem. Any thoughts?

Thanks!

[Matt Cramer]

GM sensors are meant to be good enough, not lab grade. That much error doesn't really surprise me. You could fine tune it with the Calibrate Thermistor Tables if it worries you.

[classic-indy]

I was thinking about it today when driving to and from work. As long as they are reading consistently, and I tune my VE table to those temp. readings I shouldn't have a problem. I just wanted to check.

I was briefly toying with using the GM Temperature Sensor Resistance and biasing it for the IAT and the CLT. Because my project is a snowmobile I will not be running is warmer than max 50 F or 10 C. So my logic is to give the IAT and CLT more resolution at their respective operating temp ranges. Thoughts?


Degrees F Degrees C Ohms

-40º ; -40 ; 100,700

0º ; -18 ; 25,000

20º ; -7 ; 13,500

40º ; 4 ; 7,500

70º ; 21 ; 3,400

100º ; 38 ; 1,800

160º ; 71 ; 450

210º ; 99 ; 185

Thanks,