What is the sensor that reads that the engine is cold, and needs richer fuel mix? Where is it located?

 

Sorry i read over this post. The sensor is called the DME temperature sensor. It is located on the side of the block, just underneath the 1st intake runner where it attaches to the head. It will have a connector that is blue/lightblue/green depending on how long it has been on the car, and how the heat has discolored the plastic. It is either a 17mm or a 19mm wrench to remove it.