Backfires

Hi and thanks for using 2CarPros.

An engine backfire can be caused by a few things.

First, take a look through this link:

https://www.2carpros.com/articles/engine-backfires-while-running

Now, since your vehicle won't start, I suggest checking engine compression. Here is a link that shows in general how it is done.

https://www.2carpros.com/articles/the-reasons-for-low-compression

https://www.2carpros.com/articles/how-to-test-engine-compression

Here are the directions specific to your vehicle for testing compression:
COMPRESSION TEST
ENGINE COMPRESSION TEST
Perform the following steps in order to conduct a compression test for VIN T.
1. Conduct the following steps in order to check cylinder compression.
1.1. Engine should be at room temperature.
1.2. Disconnect wiring from the ignition module.
1.3. Remove the spark plugs.
1.4. Throttle body valve should be wide open.
1.5. Battery should be at or near full charge.
2. For each cylinder, crank engine through four compression strokes.
3. The lowest reading cylinder should not be less than 70% of the highest.
4. No cylinder reading should be less than 689 kPa (100 psi).

IMPORTANT: The results of a compression test will fall into the following categories:

Normal-Compression builds up quickly and evenly to specified compression on each cylinder.
Piston Rings-Compression low on first stroke. Tends to build up on following strokes but does not reach normal. Improves considerably with addition of oil.
Valves-Compression low on first stroke. Does not tend to build up on the following strokes. Does not improve much with the addition of oil. Use approximately three squirts from a plunger-type oiler.

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Let me know if something here helps. When you read through the first link I attached, you'll note that it discusses fuel pressure and many other things. First and foremost, if the check engine light was on prior to this problem, scan the computer to see if there are diagnostic trouble codes stored that may point us in the right direction. Here is a quick video showing how to scan a computer.

https://youtu.be/YV3TRZwer8k

Let me know what you find or if you have other questions.

Take care,
Joe