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Another good indicator of a failed AOS is excessive vacuum on the oil filler cap. If it's good it should be easy to remove while idling and a bit of vacuum is normal as well as a rough idle when removed. When my failed I could just barely remove the cap.
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Chris
'86 944, manual steering, a/c delete, 944Max chip
'87 951, K27, LBE, Turbo S brakes, Koni Yellows, Weltmeister sway bars / strut brace, LSD, full cage, OMP race seats
'01 Boxster - Seal Grey / Black / Black, Litronics upgrade / de-ambered
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