K Yukon/Denali 4WD V8-5.7L VIN R (2000)
Catalytic Converter: Description and Operation
General Description
The catalytic converter is an emission control device added to the engine exhaust system to reduce hydrocarbon, carbon monoxide and nitrogen oxide
pollutants from the exhaust gases. The catalyst in the converter is not serviceable. The catalytic converters used on gasoline engine vehicles with Light
Duty Emissions (vehicles below 8,600 lb GVWR) are part of the Y-pipe and are attached forward of the flat flange.
The catalytic converters used on gasoline engine vehicles with Heavy Duty Emissions (vehicles above 8,600 lb GVWR) are both part of the Y-pipe
assembly and the muffler assembly. One converter is attached forward of the flat flange and the second converter is mounted rearward of the flat flange.
The diesel engine also uses a catalytic converter. Individual exhaust system replacement components versus one complete assembly will vary upon
body/chassis and engine designation.
The luxury vehicle catalytic converters are available in the Federal emissions or the California emissions version. The Federal package provides 2 flat
converters. Unlike, the standard arrangement, the California package provides 2 round, tubular converters. The luxury versions are equipped with a
molded exhaust tip extension that is not serviced separately.
Heat shields are used to protect the vehicle and the environment from high temperatures developed by the exhaust system, especially the catalytic
converter.
NOTE: The catalytic converters require the use of unleaded fuel only. Using leaded fuel will damage the catalytic converters and other emission system
components.
