TSB Document:

• Sorry, the NHTSA has not posted this TSB document yet.

You can still get the detailed info from GMC for this TSB. Call your local GMC dealer's service department & ask for a copy of TSB# 3400.

Affected Component: FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:INJECTORS

Summary

ROUGH IDLE, FUEL KNOCK OR SMOKE WHILE DRIVING, COMBUSTION LEAK TYPE NOISE, OR A MISFIRE. 6.6 LLY INJECTOR KNOCK, HEAVY SMOKE DURING WARM UP CYCLE. *TT

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