why ill my truck not start in the morning when it is really cold outside?

Answer 1

"To put it very simply: When you turn a car's ignition key, it makes the engine's spark plug spark, which on a good day ignites the mixture of fuel and air—yes, air—inside the engine. The oxygen in the air is an essential part of this reaction. Without it, the combustion reaction can't take place, so the fuel won't ignite, and the car won't start. (It's the same reason you can put out a fire by smothering it—fires can't burn without air.)"

"In the winter, the air is there, but it's very cold. And since all chemical reactions slow down in cold temperatures, it's harder to set off that combustion reaction. What's more, the car's battery is also cold, which means its chemical reactions have slowed down, which means it won't be able to send power to crank the engine very efficiently either. As a result of all this, if the temperature drops below a certain critical point, the combustion reaction may not happen at all."
- Bob Hirshon.
http://www.sciencenetlinks.com/sci_update.cfm?DocID=153

For a global overview of vehicles in the cold:
http://www.swedishmission.com/misc/cold.asp

Answer 2

You really haven't told us much,like what kind of vehicle,the year,how cold ect.If its not to old using a 5w30 synthetic oil will help it start and warm up quicker.When we were in a very cold place I use to plug in a hot plate and leave it under the vehicle,the heat would rise and in the morning it would start right up.Good luck,hope this helps.

Answer 3

I know this sounds dumb but you could try putting a blanket over the engine, under the hood, at night to keep the cold and moisture off, in the morning take it off before trying to start her up and see what happens, it used to work for me in the winter.

Answer 4

various of issues ought to water interior the gas freeze up in gas line battery no longer having a sufficient chilly cranking capacity , water may be interior the disturber .they make purifier to eliminate water out of the gas have the battery checked .also make a sprig to coat eletric factors

Answer 5

battery is cold, causing a drop in power, and the motor gets very cold, causing it to require MORE power to start it. use a block heater or battery heater, makes life so much easier.

Answer 6

Because there is something wrong with it. You do not say what your problem is. If it doesn't crank it could be the battery. If it cranks and cranks it could have a fuel delivery problem. It would help to know the year, make and what it does do.

Answer 7

Cold weather makes it harder for your battery to provide enough power to start your car. Having an old battery makes it even harder-If your battery needs to be replaced-do it.

Answer 8

probally your battery is on its way out and when it is cold it dont have the charge that it should until the sun comes out and warms up the battery

Answer 9

what vehicle You call "my truck"

tractor trailer?