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No, but one would assume it could be related to the evap system, have you tried leaving the gas cap loose? Disconnecting the evap system and capping it off at the vacuum side? You cannot cap off the tank side as it needs to breathe somehow.
Knocking would seem to be indicative of leanness maybe from a leak via the evap system.
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1987 928S4
1992 968 cabrio
2009 957 Cayenne GTS
Last edited by Jfrahm; 04-19-2017 at 07:40 AM..
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