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Misfiring code 300,302&304 undate


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Lost compression in cylinders 2 & 4 at the same time 2 is 20 psi and 4 is 30 psi. Cylinders 1 220 and 3 185. What could corser those to cylinders to drop compression and the same time.

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I am thinking that the most likely underlying cause is a head gasket failure.

From my previous research, common causes of head gasket failure include using incorrect coolant which can damage/deteriorate the head gasket material and increased oil pressure due to overfilling the engine oil level. Another common cause is the engine overheating leading to the head gasket failure.

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