Porsche Repair Questions? Ask a Mechanic for Answers ASAP
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I have seen in some cases on some models if there is a fault with the mass air flow sensor this can cause this type of feel or running condition and needed removed and cleaned or removed and replaced to correct this type of fault here.If this has not been checked into to see if this is the cause here this needs done.If this was already checked into and found to be o.k. let me know so we can continue.
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This is possible that the diverter valves are causing this here.If these are after market I would have these checked/tested to see if this is the cause here.You might have the turbo checked for any leaks in the boost system as this can cause this as well in some cases.
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The traces of engine oil can indicate engine blow by with engine oil ring failure blowing engine oil into the intake or an issue with the turbo itself.In some cases this can set a fault code but with blow by I have seen where no codes can set in some cases as well.it is difficult to pinpoint the exact fault from here without seeing and testing the vehicle so this will need to be checked into/tested further to pinpoint and repair the cause here.I am really leaning on the diverter valve fault here since they were replaced with modified components.