[seningen]

Originally Posted by sfkjeld

Wow, you’ve become quite the Porsche expert. And now that you mention it, believe the Marin dealer said something about the water pump. I’d just never heard of a water pump blow an engine. Huh, a new thing to worry about.

I just drove my current Boxster from Colorado to SF. It has been making an odd clattering/growling sound for months, audible only at idle and very low rpm. Now it has gotten a little louder. Tho once the car is running >2k rpm, inaudible. Probably drowned out from engine noise. My first thought was timing chain tensioner, but now I am thinking water pump. No coolant leaks tho. Any thoughts?

Hard to say without hearing it.
Check the heat shields...

Optionally
Take off the serpentine belt and see if it still makes the noise.
If it does, check WP
Or idler pulleys

M