I came across a little post somewhere on the internet a while ago and was just wondering if anyone else has heard about it.

The post said about installing a variable resistor inline with the coolant temperature sensor. Therefore, if the resistor was adjusted so that the computer read the engine as running a little warmer, the ECU would slightly lean out the fuel mixture and therefore increase you fuel economy. Overall in theory it may sound good but what are the implications of actually doing this?

 

It won't work. During closed loop, part throttle operation, the oxygen sensors will tell the PCM about the lean mixture and it will be corrected back toward stoichiometric.

 

I feel stupid now.



GB :)