Watch Out for Debris in Certain GM Vehicles
Certain 2019 and prior GM vehicles (2017 Chevy Caprice, for example) may be equipped with a new style of catalytic converter known as the close-coupled catalytic converter.
If an engine breakdown or non-function occurs such as broken intake/exhaust valves, piston failure, etc., debris may be deposited in the converter through the exhaust ports.
If the engine is non-functioning due to a severe over-heat event, damage to the ceramic brick in the converter may occur. This may result in ceramic debris being drawn into the engine through the cylinder head exhaust ports.
If a replacement engine is installed, the replacement engine may fail due to debris. When replacing an engine, the catalytic converter must be inspected.
About the Author
Information courtesy of Mitchell 1
Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.
Mike Mavrigian
Motor Age Editor
Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.