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well a couple things could be wrong depending on what year. if it is a hydraulic lifter then the oil pressure might not be high enough for the oil to reach the lifter causing a knock. another problem could be that your rod and main bearings could be worn out causing a knock and low oil pressure.

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Q: Knock in the engine that comes and goes the oil pressure is on the low side and you had lots of recent repairs around the engine are you losing your engine?
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