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Old 09-22-2015, 07:41 PM   #14 (permalink)
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Location: Denver, CO
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Colorado - '17 Chevrolet Colorado 4x4 LT
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You are basically correct. Emissions requirements are fairly restrictive, and catalytic converters can only deal with a certain amount of HC. The engine must be fairly clean already, or you will poison or cause a fire in your converter. That's why car manufacturers started implementing fuel injection along with catalytic exhaust converters. There are very few vehicles that had carburetors and catalysts both, it was a quick transition.
I'm not coasting, I'm shifting slowly.
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