whether it was involved in a accident or just over heating why does it catch fire i have a good idea about accident but not the other

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If it’s just a fire, electrical #1; on a semi it’s the brakes. Now in an MVA, leaking oil or gas would be the culprit caused by a spark or dropping on something hot. Overheating has little or no effect other than wasting our time, got to love cell phones.
Right on, electrical :)
There are usually a ton of "reasons." A lot of time it's hard to pinpoint. Vehicles are manufactured with defects every once in a while. The one that stands out the most to me would be the 88-94 Ford Tempo. This car had an ignition problem that would short out and catch the passenger compartment, usually while folks were driving down the road. Electrical is probably the most common culprit of most car fires, followed by arson and other mechanical problems.
ahh i gotch see i witnessed a accident in july of 07 and a crown vic was rear ended by a pick up and( i know they have sharp parts by the gas tanks and if they dont get them fixed and something like this happens they blow on impact )let me tell it scared me shitless it was a taxi and the driver said he had 3 people in the back and i only seen the fd pull him out
Electrical shorts, sometimes you'll even have field mice build nest in the engine compartment and that will catch fire.
Fire starting simply as a result of a rear-end collision is rare. It would probably be something like a small puncture in the fuel tank, fuel then vapourising as it hits a hot exhaust and then being ignited by damage to the electrical system. Can it happen? Of course. Does it happen? Not in most rear-end collisions. How many rear-enders do we see, how many of those involved fire?
How about the good old ash tray...leaving a lit one in there and walking away. I have had a few of these.
Most of the fires in the mid 80's to early 90's Fords were due to the rectifier in the Alternator shorting out rather than the ignition.This could/would happen whether or not the ignition was on.Another factor of note is MANY of todays vehicles run at 195F plus and have fuel line pressures in excess of 40PSI.Anybody see a potential problem here?A little leak,a lot of fire.
I think alot of vehicles burn due to friction. Hot brakes, loose parts etc.
Also the frition caused by the montly loan payment rubbing against the insurance payment.
Someone has to say it:

Fire is the oxidation of a combustible material (fuel, insulation, seats, occupants, clothes, etc) releasing heat, light, and various reaction products such as carbon dioxide and water. If hot enough, the gases may become ionized to produce plasma. Depending on the substances alight, and any impurities outside, the color of the flame and the fire's intensity might vary. Fire in its most common form can result in conflagration, which has the potential to cause physical damage through burning.

http://en.wikipedia.org/wiki/Fire
I have seen this before:)
Here's the secret....Now, don't tell anyone.....BUT...If flammable and /or combustable liquids get hot enough they catch fire......Please don't tell anyone else about this ok...? I might want to write a book someday.....Paul

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