The cat in my Integra was holed out due to an O2 sensor going bad and dumping fuel into it. But at start-up it would shake and then go to a back-up mode in the ECU and not read the sensor and then it ran fine. The check light would come on. But yes, the extra fuel just cored that thing out. Funny thing is, it just barely failed MD emissions even with really not having a catalytic converter in it. This was a 1987 Integra though. I traded it for a Type-R back in the day. What a sweet car that was.
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