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  1. 2

    Running lean p0171 p0174

    Here is the freeze frame
  2. 2

    Running lean p0171 p0174

    2009 gmc yukon xl 6.2l After replacing fuel injectors reman. 4 NEW O2 Sensors walkers and remain throttlebody. All from rock auto and parts seems to be working great. I went on vacation drove truck 7 hours hwy speeds and 1 week of driving no problems. Drove to another city about 7 hours away...
  3. 2

    Running lean p0171 p0174

    Sorry I did not mean short term. I did mean LTFT -12 the only issue is with bank 1 I didn'id not check today but I will drive it to work for a week after I change the last few parts. I did do a global reset and I will reset fuel trims tomorrow.
  4. 2

    Running lean p0171 p0174

    Ok changed injectors with re-mans. SUV is no longer running lean now bank 1 is running rich around -12 short term seems perfect and code p1175 came up. Also p2272 is still permanent after driving for a good 15 mins. Will replace spark plugs, all 4 o2 sensors , and throttle body once they get...
  5. 2

    Running lean p0171 p0174

    Ok so after reset and also reseting fuel trims suv is hard to start. Turned key and engine cranks for about 3 to 5 seconds to turn and kill. I had to do it 10- 15 times before it starts and stays running. Runs better now with engine reset. Also filled gas with 97 from empty half a tank and alc...
  6. 2

    Running lean p0171 p0174

    Just got the truck alcohol percentage reset and went to 3 percent. Also reset furl trims and truck runs better arm but their is still an issue. Fuel trims long term show fuel is showing 30percent with regular 87 gas. I did not find any vacuum leak as of yet but the previous owner did say he...
  7. 2

    Running lean p0171 p0174

    Found 2 hoses one at the back near spare tire. It comes from near filler neck next to cap and I can not find where it should go by tire side. Checked the best I could and did not find any open ports. second hose coming from above transmission and same thing could not see where it I suppose to...
  8. 2

    Running lean p0171 p0174

    Lafayette louisiana
  9. 2

    Running lean p0171 p0174

    Thanks I will check that next
  10. 2

    Running lean p0171 p0174

    43 psi verified by guage its on the pictures psi is 43 psi to 44 psi idle and driving
  11. 2

    Running lean p0171 p0174

    My scanner is zurich zr15s I can read the content levels but I can not reset it.
  12. 2

    Running lean p0171 p0174

  13. 2

    Running lean p0171 p0174

    The vent solenoid on the engine or tank the vent solenoid on the engine has been replaced intake gaskets replaced I will smoke test it to verify
  14. 2

    Running lean p0171 p0174

    I need help figuring out what is going on with my 09 gmc yukon xl 1500 denali 6.2l l9h At first vehicle ran great. Next day driving on high way p0171 p0174 came on cleared drove and then p2272 came on. P2272 came on more than once. P0304 p0300 came on at 1 point i switch ign coil 4 with 6 ans...

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