Hello,
An engine backfires due to having unburnt fuel being ignited inside the intake and creates the loud bang.
This explosion can bend the throttle actuator plate, push intake gaskets outward creating a vacuum leak and even blown apart a plastic intake manifold. When intake manifolds were made of aluminum they could better withstand this kind of problem.
This is a helpful article on backfires. This will help you guide thru what to look for.
https://www.2carpros.com/articles/engine-backfires-while-running
If the backfire is severe enough it will blow out gaskets and which will prevent the engine from starting.
Please let me know of any questions.
Thank you.
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Sunday, August 8th, 2021 AT 12:10 PM