Ignite means to set fire to, so I hope she is not being too literal! However, you start a car by using the ignition key in the ignition, so without any knowledge of the internal combustion engine, putting that together with the fact that there is a spark plug, I guess there is some sort of internal 'igniting' going on. However, I've never heard of anyone saying they ignited their car unless they were after the insurance money!
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