car still diseling run on prob

The cooler you keep your engine the fatter the fuel mixture can be. It will make more power too but of course fuel mileage will suffer. There are still some people on here that believe the hotter the engine the more power it makes, it's simply not true. It is true that heat is energy but too much heat and the air charge is less dense, that's why you can run it leaner. Plus with the colder stat and extra fuel it will help keep the intake charge cooler and the combustion chamber cooler as well. This will also reduce the tendency to detonate and diesel when shut off.