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It can be a number of things, burnt exhaust valve, bent vales, worn rings popped vale seats, blown head gasket etc. To narrow the problem, check the compression on the low cylinder, before rechecking it squirt a little oil into the combustion chamber, if the value rises noticeably it is worn rings if not you can eliminate that. by directing compressed air into the chamber and listening for the leak at the exhaust pipe, or the intake you can determine which valve is the trouble. if you get bubbles up through the coolant you have done the head gasket.

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