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Old 02-10-2011, 01:48 PM   #8
Maxodus
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Join Date: Mar 2007
Location: Sunnyvale, CA
Posts: 52
Could be many reasons but from my experience, and knowing this is the "S" model engine, i'm putting my money on a broken valve spring.

Good luck with the diagnosis and report back if you can!
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2003 Boxster 2.7L 5 spd
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