Quote:
Originally Posted by Phantom
Even though the engine is not running lean the air the catalytic converter sees is very lean and can harm the cat.
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I don't think so. Oxygen will not kill the cat, no harm done. Just think when
you release gas padel during cruise speed on general vehicles, fuel will be cut
out, pure air instead of exhaust will be pumped onto the cat. Such case
happens frequently during normal driving, does it kill the cat? NO！So please
don't worry, oxygen will not harm the cat. Something that does harm to the
cat is un-burned HC from lean burn, which will not be involved within DCD.