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Re: 1990 Pontiac Grand Am GP NOx
Posted to Emissions Forum on 10/22/2004 1 Reply

The cat and muffler was replaced and the system is now gas tight. The installer mentioned that the cat was empty. The previous gas numbers were engine out gases. A new Carsound cat was installed. The final #s are:

15mph

HC 82ppm

CO .13%

NOx 764ppm

CO... Login to read more.

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