GM Converter and Engine Replacement

Tech Tip: Close-Coupled Converter And Engine Replacement

If an engine breakdown were to occur, debris may be deposited in the converter through engine exhaust ports.

MODELS: 2019 and Prior GM Passenger Cars and Trucks with Close-Coupled Catalytic Converters

Certain 2019 and prior General Motors products may be equipped with a new style of catalytic converter, technically known as the close-coupled catalytic converter, providing quick catalyst warm-up, resulting in lower tail pipe emissions earlier in the operating cycle.

If an engine breakdown or non-function were to occur (such as broken intake/exhaust valve or piston), debris may be deposited in the converter through engine exhaust ports. If the engine is non-functioning due to a severe overheat event, damage to the ceramic “brick” internal to the catalytic 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 in either of these instances, the replacement engine may fail due to the debris being introduced into the combustion chambers when started. When replacing an engine for a breakdown or non-function, an inspection of the catalytic converters and all transferred components (such as exhaust/intake manifolds) should be performed. Any debris found should be removed. In cases of engine failure due to severe overheat, dealers should also inspect each catalytic converter for signs of melting or cracking of the ceramic “brick.” If damaged is observed, the converter should be replaced.

You May Also Like

Diagnosing P0420 Or P0430 DTCs with Catalytic Converters

It’s important to understand the basics of catalytic converter chemistry and how catalytic converter failures are diagnosed.

Although modern OBD II technology has simplified catalytic converter diagnostics, it’s still important to understand the basics of catalytic converter operations when dealing with a P0420 or P0430 diagnostic trouble code (DTC). DTCs P0420/P0430 indicate that catalyst efficiency is below predetermined thresholds on cylinder banks 1 and 2, respectively.

Exhaust Repair Options

If a replacement does not meet or exceed the flow characteristics of the original, it could mean more than a loss of power.

Catalytic Converters: Efficiency Code Diagnostics

Understanding catalytic converter efficiency codes can be a long road to a happy customer or an expensive comeback.

Exhaust Manifold Leaks Cause Issues For The Oxygen Sensors

The engine management system does not know there is a crack in the manifold.

Catalytic Converter Theft Crisis – Due to Covid-19?

Catalytic converters have become a hot product among thieves. Has the global pandemic played a part?

Other Posts

Engine Components (VIDEO)

Engine management components are notoriously complex. This video is sponsored by The Group Training Academy.

Auto Pros Visit Concord Engines, Kannapolis, NC

Auto Pros on the Road puts the Babcox Media team on location in shops across the USA. This episode is sponsored by Autolite.

Dodge®/Ram® Cummins® Turbo Diesel Engine Repair Solutions

Known for their versatility and toughness, diesel engines are the first choice for many truck owners—and among those engines, Dodge®/Ram® Cummins® turbo diesels consistently rise to the top of the pack. Since 5.9L engines produced between 1991 and 2010 provide reliability you can count on, don’t trust their repairs to anything less than top-quality service

VIDEO: ACDelco Starter And Alternators

High under-hood temps, increased power demands and vibration can damage alternators or starters. Sponsored by ACDelco.