My car made a backfire noise, and now it will not turn over.
The backfire noise most likely was the timing belt breaking. The timing belt and balance belts will need to be checked to see if they broke. The fuel pressure would also need to be checked to see if the fuel pump failed; this is the second most common cause for your problem. I recommend that you have a mechanic, such as one from YourMechanic, come by and make a proper diagnosis of your car not turning over.
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