Quote:
Originally Posted by Monooxide
I had the same issue with my Electromotive ECU at first. I unplugged it and fiddled with the wiring, it seemed like the wire wasnt seated in the plug.
IAT sensors will default to a standard air temp rather than super cold or hot when they receive a bad/no signal from the thermister. Check your wiring.
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No....it does respond, just not quickly enough. If I let the car sit there and idle, then eventually, heat builds up under the hood and the charge air temperature goes up by a few degrees.
I was reading this on another (BMW) forum where people were seeing the same thing....
Basically they took a blow dryer to the sensor, and it took almost 5-10 seconds for the sensor to register a large change.
I am wondering how much this effects the tune....
I think for any full throttle pull, if the temperature is consistently going up in the same manner, then this essentially is "hidden" in the tune....i.e. even though you aren't "registering" the increase in temeperature correctly, maybe you are taking into account indirectly by dialing in the right timing and fuel.
Perhaps with a unit like the PFC, the IAT sensor is NOT intended to be used as an "instantaneous" temperature detection tool to affect timing and fuel, but rather as a more "global" tool to detect the outside air temperature as a way to globally trim the fuel/timing maps due to changes in the air's initial (ambient) temperature....
Just some thoughts....maybe Steve or JohnGriff will chime in on this.
EDIT:
Also, in response to your post, yes this does happen.....I recently had a loose ground wire, and it was reading a default value of -33*C hahahaha