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When posting a question like this, it helps if you supply some details about your car. For instance, which engine do you have? This is an Internet guess but, due to defective engine blocks, Ford's I-4 EB engines have been known to develop coolant intrusion into cylinders 2&3, which gets burnt. There would be no obvious leaks in such a case, but a professional diagnosis is in order here. https://youtu.be/_8nQ1NZW_GI?feature=shared