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Writer/Teacher
Join Date: Mar 2001
Location: Wandering Connecticut
Posts: 9,293
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‘07 Cayman S (987): Surging Idle/RPMs
I have an interesting issue in my 2007 Cayman S with 67k miles. The car has a surging idle when warm, which extends to on-throttle behavior: when one’s foot holds the throttle steady at what should be 3K RPM, the engine surges rhythmically between 2K and 3K.
I saw recently that one of the coil packs was starting to crack, so I replaced coil packs and plugs preventatively, with fingers crossed that it would cure the surging RPM issue, but no dice.
I’m suspecting either a vacuum leak somewhere, throttle sensor, or possibly MAF sensor? Any thoughts?
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