Answers: Lets do a little Automotive 101 here.
The Ford Man give you the Spot On correct answer. What I am going to do is elaborate you you better apprehend what is happening.
When you first start an engine it requires a richer Air/Fuel Mixture because the gasoline cannot evaporate properly and mix next to the incoming cold air. Like sea if the intake air temprature is cold satisfactory the gasoline will condense inside the intake manifold, (exactly like peas in a pod way marine forms on your Iced Tea or Ice Water in the summer).
If plenty fuel condenses out of the incoming Air/Fuel Mixture it will become so lean it will not fire when compressed and ignited by the spark plug.
In an engine a ratio of 14.7 parts nouns to 1 part fuel is other attempted to be maintained be the computer. This provides the genuine best ratio for the most efficent fuel usage and burn properties. When the engine is cold the computer compensates by intruducing more fuel to change the ratio to something closer to 12.5 or 13 to 1 contained by order to supply the engine plenty fuel to get reheat.
Now once the engine is warm the fuel mixture wishes to be leaned out to mantain the proper power balance for efficency.
You may hear in the region of placing a Cold Air Intake System onto your vehicle. Do not let the residence confuse you as to what is going on. This simply means the intake system is picking up the cooler nouns from outside the engine compartment to allow for a denser oxygen supply for the fuel.
As air heat, it looses oxygen. Without the oxygen, fuel cannot burn properly. Increasing the oxygen supply through, Super Charging, Turbo Charging, Nitrus System, Ram Air System, Cold Air Induction or a Cold Air Intake System is how this is done to increase horsepower and torque.
When your engine is warmed up to operating temprature, this is when it is operating at highlight efficency and power, (provided its properly tuned and maintained).
Now once your engine is warmed up it can comfort evaporate the fuel droplets from the injectors into a completely gasious state as it is entering the cylinders for the combustion process.
I hope that helped you out, and help you understand what is arranged. Good Luck!
I hold to achieve a smog trial...
Ideally you would be putting cold air into a thaw engine.
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