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Old 06-01-2010, 03:06 AM   #4
coreseller
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Join Date: Oct 2007
Location: Midwest
Posts: 1,746
My best guess would be a bad lifter. When I worked on my Boxster earlier this year the motor sat without oil in it for 3 or so weeks while I waited on parts / transmission rebuild. When I first fired it up it made a similar clacking sound for the first 10 or so minutes, it gradually went away. Other two potentials; loose spark plug, exhaust leak?
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