i would recommend removing the EGR and cleaning it, i would use sensor safe carb and choke cleaner. most likey the EGR gasket will need replaced as well. also inspect and clean the vacuum lines and solenoid if it is a vacuum controlled EGR
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Originally Posted by curtis73
There are several ways of doing this, but one of the more effective is using a product from GM. You'll probably have to get some from a GM tech since its not an over the counter thing.
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you should be able to buy GM Top Engine Cleaner at the parts counter of any GM dealership. P/N 1050002 for the 15 Fl. Oz can, but i beleave it also comes in other sizes.
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Originally Posted by Mustangman25
A new catalytic converter could help, if not solve the problem.
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a Two-way catalytic converter does not effect NOx, a Three-way cat does reduce NOx.