Kia Troubleshooting Questions? Ask a Mechanic
Hello I'm Brandon - Kia tech.
The problem is from KIA. The defective engine part called the crank sprocket. The engine defect leads to a catastrophic chain of events that starts with severe heat buildup and the release of debris. The piston collided with the valve most likely causing the loss in compression.
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There is also a timing chain tensioner problem with these engine as well. They tension could have released at one point causing the chain to jump and kill the engine.
I would also inspect the crank sprocket for inspection.