Older Porsches might tell Dad Jokes
TRENDING TSB
Owners of certain Porsche Cayenne, Panamera and Macan models as of 2010 may notice an engine knock during hard acceleration, but this isn't the beginning of a bad joke. According to Porsche Technical Information bulletin 17/18, excessive carbon buildup on the intake valves and intake ports can cause knocking combustion under high-load conditions. Before replacing ignition components, sensors or internal engine parts, Porsche says to inspect the intake valves and ports for carbon deposits first.
If carbon buildup is confirmed, the fix is surprisingly straightforward. Porsche recommends cleaning the intake valves and ports using the VAS 294 011 cleaning system. The process blasts a specialized cleaning media into the intake ports with compressed air while simultaneously vacuuming away the loosened carbon deposits. Just be sure the intake valves for the cylinder being cleaned are closed before getting started.
Turns out, the only thing knocking was years of carbon asking to be let out.
The detailed repair procedure is included in the TSB.
The entire TSB can be found by logging into ALLDATA. Under Select Vehicle, enter in the search field:
2015 Panamera
Select the vehicle underneath, then enter in the search field (upper right corner):
Carbon
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