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According to my ecu, it leans itself out as the temperature get higher.
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That is programmed into your ECU - is that the intake air temp or the engine temp? He was referring to the VVT-i engine in my xB and other vehicles with the same engine like the Echo Yaris xA - makes some sense as a richer mixture burns cooler - also said that it could be programmed out if someone hacked into the code - some on the Scion World want it done to prevent power robbing corrections when they hop up their motors.
JanGeo 
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