92' Nissan 240sx

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I've taken my car for a diagnostic to figure out why i can't pass the smog and they told me that my catalytic converter is not good. I'm thinking its more than just that. Maybe its engine wear. Is there anything I can do to pass the smog test and decrease the smoking. Thanks.

posted by  distincjive25

IF IT IS THE VALVE SEALS, putting no smoke might help you.it is a thick additive that does not drip so easy past the valve guides.once it passes drain it out.if its the guides rebuild the head if you like the car

posted by  the lobster

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