Check Engine LightAt about 70,000 miles the 993 Porsche will usually have a check engine light come on which refers to the secondary air system, but what is really happening is the air injection ports in the head are clogged with carbon. The only correct way to fix this problem is to disassemble the engine to the heads.Have the heads and cam towers bead blasted to remove the carbon build up. At this point it is also highly recommened to have the valve guides and valves inspected for excessive ware. |
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Porsche misfire |
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