Originally posted by Phil C.:
Heres something I heard about CAI's. Ok this may sound stupid and this states doesnt come from me, but i heard this from some guy. ok first off all of our cars are fuel injected. They have an air temp sensor i believe for the air coming from the intake and to the engine. Now i hear that on fuel injected cars the pcm interupts with this open cai system. the cold air comes in but the sensors changes the airs temp to factory standards through the pcm. I was curious about this, sounds like some bs to me but thats why im asking you guys.
thanks 
Hello,
The only thing you change w/ a CAI, is the restriction of the airflow. You lessen the restriction, the temperatures remains the same (according to the PCM). If the intake air is a bit cooler than it was yesterday, I would think the PCM would not take that into consideration. Air flow, on the other hand, will change dramatically, which is why you disconnect the battery for the given time to "reset" the PCM. So it can adjust the fuel tables according to the air flow. All in all, according to what I've read, the PCM "learns" how make the enging run optimal to most changed conditions after unplugging it for a 1/2 hour.
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