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Morning Drives
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bberryj, did you resolved this issue? came across this thread and I'm also experiencing the same symptoms. I have a 997 C2S with M97 engine and I believe the culprit is the Vapor Canister Purge Solenoid - Porsche (997-110-129-00). I also checked the fuel line vent valve as described by many with non M97 engines and for my particular variant its just a physical vent tube from the fuel tank to the vapor canister. The Purge Solenoid as described to me by Sunset Porsche of Oregon is responsible for venting the fuel vapors from the Carbon Canister to the combustion chamber to be burned. The predicament I face is that there is no DIY. It is speculated that the Purge Solenoid is behind the intake manifold left of the engine. From what I surmise, threads that point to its location for 996s and non S 997s and turbos is by/vicinity of the alternator. That is not the case for M97 997 S, it hidden behind the left intake manifold and takes a bit of disassembly to get to it. I'll be venturing on that DIY shortly.