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Originally Posted by blackjack
yes,it does cancel the 1-4 shift idiocy,and lowers underhood temperature,resulting in slightly more power..it also improves the idle quality...any gm dealer should be able to order it for you...i dont know the part number,but the description should say AYBK,or something similar,and was part of a service bulletin issued from gm,for customers complaining about bad idle and lack of power when hot..im no zr-1 guru,but it did make my car happy 
blackjack
sent from my black dial telephone !! |
No stock chips disable the 1 4 shift pattern, its a epa thing. To my knowledge they do not change the temp on for fans in this calibration, it does address the other problems noted.
The only way to address the 1 4 thing is to disconnect the wires from the sensor or have a tuner disable it in the calibration, same with the fan on temps.
Tyler