Originally Posted by johnwill
What is the value you refer to?
The vlaue is the combined set of computer sensors on the truck. o2 sensor before cats after cats, exhaust temp, exhaust pressure and so on. In the current engines there are more then 50 sensors that are pre told from the factory to operate fuel based on what the sensors indicate. So if you change one thing, like a thermostat then a bunch of sensors will change there behavior. There not smart or super computers and do not learn anything. They have to be told everything so they adjust accordingly....