My brothers 99 2.5L developed a squeak or chirp on one side of the motor after a track session or spirited canyon carving. Definitely internal. Our trusted indy found seriously worn timing chain tensioner guides. 18 hours of labor later the problem is resolved. His car was probably a few thousand miles away from Ka-Boom. Whew! Bullet dodged.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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