Quote:
Originally Posted by racerxj17
just to clarify, cooler air (denser) will make the A/F go leaner, and hotter air will make the car run richer.
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Yes, the ECU gets a hot Intake temperature it cuts fuel to keep the A/F ration in place, which robs performance.
With cooler Intake temperatures it doesn't do that.
Ever notice your car running good on a cold day...its the ECU giving more fuel to burn with the denser air.