TSB Document:

• MC-10112019-9999.pdf

Affected Component: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR

Summary

This Preliminary Information communication provides information to the technician about vehicles that may have black smoke on a cold start. A dual-pulse injection strategy is utilized during engine cold start to reduce the time required to bring the catalytic converter up to operating temperature. This split injection strategy lasts for about 60 seconds on cold start. This process may cause the customer to see increased black smoke during cold start and should be considered normal.

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