Chevrolet 8999979 Catalytic Convertor

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Remove bolts at the flange at the rear end, loosen nuts, remove U-clamp, and slide the catalyst out of the outlet pipe.

No, periodic maintenance is not required for the catalytic converter.

The catalytic converter needs to be renewed after approximately 30,000 miles.

The catalytic converter is a muffler-like unit located underneath the vehicle and is incorporated in the exhaust system. It is designed to reduce the amount of hydrocarbon (HC) and carbon monoxide (CO) pollutants released into the atmosphere. 49 States and High Altitude model X-Bodies use a bead-type converter, which contains small beads coated with platinum and palladium. These beads cause chemical reactions that convert CO to CO2 and HC to CO2 and H20. The California version X-Bodies use the Phase II Monolith converter, which has a honeycomb-type internal design coated with platinum and rhodium. This catalyst helps reduce oxides of nitrogen in addition to HC and CO. To maintain the effectiveness of the converter, only unleaded fuel should be used. Periodic maintenance is not required, but the converter has a limited working life and needs to be renewed after approximately 30,000 miles. A 'catalyst' reminder light will appear on the speedometer when the useful life of the catalyst is depleted. If a bead-type converter is rendered ineffective, it can be replaced with a new one or the beads can be drained and replaced. The Monolith converter cannot have its catalyst replaced separately. If the bottom of a bead-type converter is damaged, it can be replaced without replacing the entire converter. It is important to note that the converter operates at a very high temperature, so caution should be taken to avoid burns when working on or near it.