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Various Driveability Symptoms Due to Clogged Fuel Injectors, MIL/SES DTCs P0171, P0172, P0174, P0300, P1174, P1175 (Clean Fuel Injectors and/or Perform Injector Test With AFIT - CH-47976) #03-06-04-030C - (03/15/2007)

ALL GM Vehicles.
Condition
Some customers may comment on any of the following various driveability symptoms:

? Extended Crank Time

? Hard to Start

? MIL/SES Illuminated with DTCs:

? Hesitation

? Lack of Power

? Surge or Chuggle

? Rough Idle

? Light or Intermittent Misfire

Cause
Due to various factors, the fuel injectors may become restricted. Extensive testing has demonstrated that fuel related issues are the cause of clogged injectors. At this point, no specific fuel, fuel constituent, or engine condition has been identified as causing the restriction. The restriction causes the engine to operate at a lean air fuel ratio. This may either trigger the MIL to illuminate or the engine to develop various driveability symptoms.