another one for the MSQ gurus

[SuperV8]

I have given it 3 points -9C and 600k ohms, 13C and 140k (the current temperature of the engine and 90C and 6800 ohms, plug them in the table with the bias value in the manual (which I think is "standard" value out the manual and write it to the ecu and tuner studio says the engine the engine is at off the hot end of the scale.
To get it to read 13C (temp of block) I need to tell it it has a 110kohm bias resistor

I would double check you have input the correct resistances, only input ohms not k ohms, an easy mistake to make (speaking from experience ).
The only adjustment of the bias resistor would be to measure exactly its resistance (R4 or R7) and input that inplace of the standard figure of 2490.
I would also check the resistance of the wire going to the sensor to double check the wiring harness?

Tom.

[kiwicar]

Thanks Tom
Yes I did put the values in in Ohms, and checked the number of "0" s I will recheck wiring, the really confusing thing is the standard GM values that are close ish to those of the sensor I have gives results out by about 15f at ambient.
I will check the loom.
Best regards
Mike

[DaveEFI]

Thanks Tom
Yes I did put the values in in Ohms, and checked the number of "0" s I will recheck wiring, the really confusing thing is the standard GM values that are close ish to those of the sensor I have gives results out by about 15f at ambient.
I will check the loom.
Best regards
Mike

Because your given values are so close to the GM makes me think the problem is elsewhere.

[kiwicar]

Hi
Well a result, I think
I now have a selection of three 2 wire sensors, I chose one with characteristics closest to the GM ones and ran an earth back to the star point on the block, put in 3 points and it now reads within 1 degree Fahrenheit at ambient temperature.
Actually I ended up with 7 points for each sensor and drew them out on a graph,i did tis wit all 3 sensors mainly to see what sort of curve they had so I could choose one most similar to one of the existing sets of points already in tuner studios now the final result of 1 degree at ambient only works when a particular 3 of the 7 points are used, otherwise it is more like 6 to 7 degrees difference.
well it is done now to look at the IAT I supose.
Best regards
Mike

[SimpleSimon]

Just seen this post I would stick with the MS generic GM style IAT sensor to keep things simple that way you have no calibrating or offsetting to worry over and the MS already as the default values

[kiwicar]

Hi .
I have the IAT set up, that was bought from a reputable supplier as as the right one for he job, the standard one for MSQ3, again it is close-ish about a factor of 2 out over the mid part of the curve.

best regards
Mike