Hi,
Could you record the noise you are hearing and upload it for me to hear?
As far as a crank no start, although the fuel pump is turning on, it may not be providing enough pressure to run the engine. We will determine that in a real simple way. See if the engine starts for a couple seconds and then stalls if you use starting fluid. If it does, then we know it is a fuel related issue. If it does nothing, then it is likely ignition related.
Take a look through this link. You may find it helpful.
https://www.2carpros.com/articles/car-cranks-but-wont-start
Try the starting fluid trick and let me know the results. Also, if you could upload the sound of the engine cranking along with the thump, it may be really helpful for me to diagnose the issue.
Let me know what you find or if you have other questions.
Take care,
Joe
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Friday, September 4th, 2020 AT 8:02 PM