So here are my test results for putting the intake air temperature sensor between -9C and -15C. Not what I expected and in my humble opinion not the same results as with the front sensor. Please check my post on page 4 of this gizmo.
Outside ambient air temp was 5C then, now 6C, which makes the circumstances more or less similar.
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So I placed a 15k resistor in the socket which gave a reading of -9C.
During warm up no STFC (short term fuel compensation). When the engine was warm, the STFC went between +0,78% and -2,34%. Not very constant.
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I then placed a 10k thermistor in the socket of the air intake sensor, just as I did with the front air intake sensor. The temp reading gave a ‘max’ of -15C.
The STFC was between +0,78% and +2.34%. It could be that when I am able to lower the air intake temp reading to -18/19 which I previously achieved with the front outside air temp sensor, the fuel compensation goes up to approx. 5%.
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I need one more test to figure out if the short term fuel compensation goes into the +5% range when I am able to bring the temperature down to -18/-19C.
Conclusion: with the same components the front outside air temp sensor got lower readings (approx. 4C) compared to the air intake sensor.
The above was expected due to engine heat.
What I did not expected was the lower STFC hovering around 0% with a max of +2,34%.