Fuel System - MIL ON/Multiple DTC's Set
Bulletin No.: IB07-11-S005Issue Date: December 2007
Various Driveability Symptoms Due To Clogged Fuel Injectors, MIL DTC's P0171, P0172, P0174, P0300, P1174, P1175
(This bulletin Supercedes IB07-02-S003)
Affected Vehicles:
2003-2008 Isuzu Ascender
2007-2008 Isuzu i-290/i-370 (TI)
2006 Isuzu i-280/i-350 (TI)
Service Information
This bulletin is being revised to update model years.
Some customers may experience any of the following various drivability symptoms:
^ Extended Crank Time
^ Hard to Start
^ MIL Illuminated with DTCs
^ Hesitation
^ Lack of Power
^ Surge or Chuggle
^ Rough Idle
^ Light or Intermittent Misfire
Upon inspection a technician may find DTCs P0171, P0172, P0174, P0300, P1174 or P1175 stored in the Tech2. Due to various factors the fuel injectors may have 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 drivability symptoms. Refer to the Service Manual for fuel injector cleaning procedures and further information.
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