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Anonymous Posted on Nov 09, 2011

I HAD DTC P0171 nd p0174 my truck is 1,500 5.7 engine can toy help me o n this one

Also ha p0300 randon misfire is a chevy pick up silverado 5.7 engine

2 Answers

Ricky Peters

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  • Posted on Nov 16, 2011
Ricky Peters
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Sounds like it could be weak fuel pump.First check the fuel pressure it should be 60-66 psi with key on engine off.It takes at least 52 psi to open the poppet valve inside the injector to allow fuel thru,so if the valve is only opening partially then it could be running lean.

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  • Expert 156 Answers
  • Posted on Nov 12, 2011
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The three failure codes you retrieved point to a vacuum leak from intake side of engine, check intake manifold with some engine starting fluid sprayed from outside around all sealing gaskets and if engine speed goes up or down noticably that would be your leakage area, also the mass air flow sensor being dirty would cause tthat and last a faulty fuel pump, not giving enough pressure but ok with volume amount, both p0171 and p0174 indicate a lean condition from each bank.the p0300 is random misfiring of cylinders, not one particular, it is a by-product of a lean burning condition.

  • Anonymous Nov 12, 2011

    ALSO if your brake pedal is a little hard to depress than normal, it would problaly be your brake booster leaking.

  • Anonymous Nov 17, 2011

    check fuel filter for restriction, do run a fuel pressure test, could also be caused by a fuel pressure regulator weak or as ricky peters advise weak fuel pump

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Check Engine Light with a P0300 due to 2 - 4 cylinders misfiring on the same bank of the engine. DTCs P0171, P0172, P0174 or P0175 may also set for the misfiring bank.

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If the published misfire diagnostic does not isolate the cause, perform the following suggestions as necessary:
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  • Inspect O2 sensor connections on the misfiring bank for corrosion or water intrusion. If water intrusion is found on the right bank, it may be due to the AC Evaporator Condensation dripping onto the O2 sensor harness. If this condition is found, reposition and shield the harness to prevent a repeat concern and repair the connections.
  • Check for excessive exhaust backpressure using the restricted exhaust diagnosis.
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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

NOTE: GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition.

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