Question about O2 Sensor mods

[Ford Man]

Originally Posted by gto78

Also, I'm trying to understand how wrapping tinfoil around the sensor is supposed to make the vehicle run leaner. It's going to make it hotter and possibly more accurate, but leaner also? Has this actually been proven?

I've tried wrapping the 02 sensor with foil and adding a spark plug anti fouler to get the sensor out of the exhaust stream. When I wrapped it with foil my mileage dropped and when I used the anti fouler it stayed about the same. This is just my experience, your results may be different.