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Car overheated random cylindar misfire after the overheat after it heats up it bogs down and eventually dies. I have done a compresion test 2 center cylander are 10-15 psi depending also little black bubbles in the oil pop. No other indicators of a blown head gasket are showing replaced oxygen sensor yesterday, its good, still cannot diagnose the problem. any suggestions?

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If the center 2 cylinders have only 10-15lbs pressure then you need to do a wet compression test to see if it is valves or piston rings that are bad.put about tablespoon of oil into each cylinder and turn over motor and redo the compression test.if the compression goes up you have a ring problem if it doesn`t it is a valve should check the oil to see if it has a white-caramel look to it as this indicates water in the oil.(head gasket) if the coolant level is low it can be burning coolant,you should have the cooling pressure tested just in could possibly be a cracked head.if it overheats because of the low compression(sometimes happens) the motor is working twice as hard(runs hotter) as the other good cylinders have to work harder to do the same amount of work,

Posted on Apr 10, 2011


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