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Originally Posted by CIWS  According to the GM letter bad Cats was one of the specific things they were to check for a tuned ECM if they were to be replaced under warranty. Due to the fact they said a bad tune could cause premature failure. Now whether a particular dealership does this will probably vary depending upon who one goes to. But as I understand it for a Cat to go bad due to "poisoning" one would have to be running rich. Since these cars appear to come from the factory running PIG rich, I would think a decent tune that would better balance the fuel-air mixture would not only gain some HP, but also extend the Cat's service life ? |
The cats have to operate at a certain temp range to work properly, you may be right. On the pig rich thing though, I didn't think these things came rich at all relative to other boosted cars. Anyone know A/F? 11:1 or above for me thanks.