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DARREN 5/31/2010
2000 GMC C3500 Sierra SLE 8 Cyl 7.4L - Engine
what could be the cause of a PO175 trouble code system too rich right bank?
1 Answer
  • HouseCallAuto
    HouseCallAuto 5/31/2010
    1. Install a fuel pressure gauge and check for the pressure to hold. If the pressure leaks, remove the upper intake plenum and check for any leaking fuel injectors or pressure regulator.

    2. If no fuel leaks, perform an injector balance test using the scan tool or injector driver tool.

    This is the most logical step because what is suspect as the cause is a leaking injector on the right bank.

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