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The main reason you car will make a backfire is cause of the amount of unburned fuel that flows down the exhause system causing it to backfire. This happends to older vehicles.
http://answers.ask.com/Vehicles/Autos/what_makes_a...
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1 Start your vehicle and bring it to operating temperature . 2 With your foot on the accelerator pedal, turn the engine off and push the pedal to the floor . 3 After a few seconds
http://www.wikihow.com/Make-a-Car-Backfire
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Cars backfire for a number of reasons. One is because of a buildup of pressure, another is because it is dumping too much fuel (in carbureted cars).
http://answers.ask.com/Vehicles/Autos/why_do_cars_...
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There are a few things that can cause a car to backfire. A few things it could be are, bad timing, incorrect ignition wiring, low fuel pressure, or damaged or missing catalytic converter
http://answers.ask.com/Vehicles/Autos/what_causes_...
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