Re: po420 and po430
just be ready for insufficient EGR flow codes in the future.
the #1 reason I see P0420 and P0430 is coolant leaking past the intake gaskets. coolant contains silicates. silicates create a coating on the converter substrate blocking it from performing the necessary chemical reactions. it doesn't take a large leak. a very small leak, even vapors, over an extended time will do this.
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Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
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