Is it louder by the valves or by the crank? I've had an oil galley go, it made it so the engine couldn't find idle without that oil pressure, so it would surge from 1000-1500 rpm in rythme. After Nissan fixed that, the car had a rhythmic noise like that coming from the bottom end all of the sudden, only on throttle. I thought it was an exhaust leak, turned out to be a spun thrust bearing. Engine seized a few months later.
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