Messing With Factory Settings is Fine for Old Cars....but Even then, the Factory could have Saved Tons of Money if You Didnt Need Thermostats..!
Hiding a Problem Doesnt Fix It. New Subarus and Northstar Caddys have Gasket Issues... Messing with Factory Settings Confuses the Computer and Car will
Think it is Cold...and Richen the Mixtures (Like Leaving a Choke On )...it will run crappy and load up converter...and decrease gas milage...and put out false readings if you need to
Smog the car.... I experimented with this stuff....it doesnt Solve problems....but.....Good Luck....Your Results May Vary....!