Does car give out a better air/fuel mixture in the morning time when your engines not warmed up yet?

Question

i meant to put "your" before "car"

Answer 1

Lets do a little Automotive 101 here.

The Ford Man gave you the Spot On correct answer. What I am going to do is elaborate you you better understand what is happening.

When you first start an engine it requires a richer Air/Fuel Mixture because the gasoline cannot evaporate properly and mix with the incoming cold air. Like water if the intake air temprature is cold enough the gasoline will condense inside the intake manifold, (exactly the same way water forms on your Iced Tea or Ice Water in the summer).

If enough 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 air to 1 part fuel is always attempted to be maintained be the computer. This provides the absolute 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 in order to supply the engine enough fuel to get warm.

Now once the engine is warm the fuel mixture needs to be leaned out to mantain the proper power balance for efficency.

You may hear about placing a Cold Air Intake System onto your vehicle. Do not let the term confuse you as to what is happening. This simply means the intake system is picking up the cooler air from outside the engine compartment to allow for a denser oxygen supply for the fuel.

As air heats, 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 peak efficency and power, (provided its properly tuned and maintained).

Now once your engine is warmed up it can help 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 helped you understand what is happening. Good Luck!

Answer 2

Yes,"Priscilla D". I ask you this just as you wouldn't get up from a sound sleep, and start running a marathon. An engine that's been siting for a period of time. Also needs a shall we say a little wake up warm up. You don't realize although the car may be old or new. All of the fluids needed to make it run safely and efficiently are siting in their prospective reservoirs. So you need to allow all the lubricants and others to reach their proper areas before you start running the engine, at 70-80mph because you are running late. The engine will run, even if you don't run it for five minutes, but eventually you will be paying for some very costly repairs. I'm sure you have better use of your money than sticking it in a car your still making payments on or what ever the case may be in your situation. Besides did you also know that by running your car 5minutes in the morning "IS GOOD FOR THE ENVIRONMENT". You say I'm crazy. It is a known fact that doing so, WARMS UP THE CATALITIC CONVERTER thus causing it to be more effective in combating harmful emissions that would other wise be expelled into the atmosphere. Mr vadebo She said "warm up" not siting Idling.

Answer 3

The engine not being warmed up as such won't make a difference - the only thing that can improve efficiency is the time of day - you mention morning?

Morning would be better...or late night too when air is at it's coolest. When air cools, it "shrinks" and becomes more dense for the same volume - that is, if you get two cubic metre boxes full of air at different temperatures, there will be more air molecules or particles in the cooler box - simply because the molecules move closer together when cold and push apart when warm (I won't explain how unless you want to know - in that case, email me)

So as such, you won't get a "better" fuel/air mixture because the term fuel air mixture refers to parts of fuel as a ratio of parts of air (similar to the way you mix oil and fuel in a 2 stroke engine). But what you will get is more actual oxygen in that same mixture, which, in theory, should result in a more efficient burn - although it's debatable to whether the results would be noticable or not without close observation and laboratory testing!

So no, you won't get a better mixture, you'll get the same, but for that same mixture, you'll get more oxygen - if that makes sense?

Answer 4

Really the fuel is very rich to air mixture, like a choke on an old car,the engine temp is warming up rapidly due to this and the coolant temp sensor adjusts the mix to keep you from getting 12 miles to the gallon after warm up.Ever see a gas car spewing black smoke out the tail pipe in the mid day.90% sure its the sensor or choke

Answer 5

When your engine is cold, the choke or the computer will increase the air/fuel mixture ratio to make the engine run better until it is warm.

This is called running rich. You are using more gas than when the engine is warm or hot.

So when the engine is hot, that is when you are getting the correct air/fuel ratio and the engine is running the most efficient.

good luck.

Answer 6

NO,because the computor runs off of water temperature sensor values that have a richer fuel to air ratio.Once the engine tempurature reaches about 195 degrees and goes into closed loop the computer via the oxygen sensor and other sensors attempt to keep the air fuel ratio at 14.7 to 1 to get the best possible fuel mileage.

Answer 7

NO, it does not. The first few minutes is probably the worst efficiency, as either the choke will be on (rich) or computer compensating for cold engine. Also both cases idle slightly higher. And engine 'intakes' air/ fuel mix, and exhausts spent gasses. (carbonmonoxides) which will be highest @ startup

Answer 8

Ideally you would be putting cold air into a warm engine.

Answer 9

I don't think so, I mean I'm sure there are ideal conditions for the fuel injector to work at, and I'm sure it's not put at ice cold.

Answer 10

technicaly no, but it does sound cooler, its just cause the cold air outside is acting like a air coolant you would have installed in a car.