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A stuck lifter is one that is gummed up with sludge. It is hydraulic and pumps oil. If it is sludged up, then it can't do what it is designed to do. Thus causing a tapping noise. Loud knock are either a rod, rod bearing, knock sensor, rocker arm, valvel spring, timing belt, or possibly just the belt tensioner. If it is a stuck lifter, the cheapest fix would be to run some engine flush in the engine, drain the oil and refill with good oil. If that works it was a stuck lifter. If not, Check with the most accessible first, pull the valve covers and check the rockers and valves. You may need to remove the intake first to access them. If it broke you will see it usually.
If nothing is broke then go to the timing belt. Hope this helps.
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