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a Stethoscope (Harbor Freight) or a long screwdriver in your ear and placed around the engine: Cam tower, Oil Pan, along the intake manifold, etc, should help you localize the noise. IMHO, it sounds like a rod knock. That's usually the case when the #2 bearing goes south due to oil starvation. If your oil pressure is very low (should be above 2 at idle and around or above 4 at 3000 rpm). If it is, you could have a crack in the oil pickup tube or an oil pump/drive issue. In any case, low oil pressure could make the lifter(s) rattle. The #2 bearing can be damaged also by a lot of cornering with low oil quantity and the oil foams up creating a dry bearing.
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3 944's, 2 Boxsters and one Caman S, and now one 951 turbo. Really miss the Cayman.
Some people try to turn back their "odometers." Not me. I want people to know 'why' I look this way. I've traveled a long way and some of the roads weren't paved.
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