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DUROC
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I posted the paragraph below yesterday on the 993 forum. It concerns the same OBD II codes others on this thread have experienced. I'm not technically qualified to say whether the fix I dreamed up could help with the underlying problem but I'd be greatful for the opinions of others, given the widespread nature of the problem. The dealer, incidentally, is recommending expensively cleaning cylinder head ports. Note that most of the posts about this problem seem to be from owners of 7-10 year old cars: My 1997 C4S has had "check engine"/emissions test failures for several years. But I have just wire-brushed the corrosion off the screw-threaded brass gas cap and greased the threads with Vaseline to create a seal. The check engine light now seems to be staying off. I ran this experiment thinking -- without knowing anything about it -- that the design of the cap was intended to seal the tank and that if corrosion interfered with the seal, it might affect oxygen sensor readings or something like that. Question: Does this reasoning make any sense? Any advice about this would be very welcome. Thanks.
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My 1997 C4S has had "check engine"/emissions test failures for several years. But I have just wire-brushed the corrosion off the screw-threaded brass gas cap and greased the threads with Vaseline to create a seal. The check engine light now seems to be staying off. I ran this experiment thinking -- without knowing anything about it -- that the design of the cap was intended to seal the tank and that if corrosion interfered with the seal, it might affect oxygen sensor readings or something like that. Question: Does this reasoning make any sense? Any advice about this would be very welcome. Thanks.