When I want to turn on my truck in the morning or after being turned off for more than 8 hours if it has been very cold A has been raining batallo to turn on, I have to keep the accelerator oppressed; He drown and sometimes he doesn't turn on.
If your engine is diesel, you may have problems with the heating or heating spark plugs or their activation system (reliever, temperature sensor ..) from there that if this 8 hours stopped or makes a bad weather, the engine is not started. If it is gasoline, then it can be a thing of the refigent temperature sensor, because of the rain, I do not think it is moisture in connectors, Ecu, etc. in a vehicle prepared for "all terrain" .. greetings !!