How to fix P0172, P0175 | Fuel Trim Rich Problems | CEL, Harsh Shift and Fuel Consumption !!

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  • Опубліковано 24 гру 2024

КОМЕНТАРІ • 15

  • @SubePelayo928
    @SubePelayo928 4 місяці тому +1

    I have p0172/0175 codes on my GMC 4.3L.
    MAF shows 9-10g/s with negative -20 fuel trims. Codes are for banks 1 and 2 rich. Not sure what else can cause it

    • @MyAutoproblems
      @MyAutoproblems  4 місяці тому

      Rich are caused by Fuel related issues as well. Check your Fuel Pump Pressure. Check the Upper Oxygen Sensors.
      Or you can first just disconnect the MAF, and monitor the FUEL TRIMS. If they go normal between +10/-10, then its a bad MAF.

    • @SubePelayo928
      @SubePelayo928 4 місяці тому

      @@MyAutoproblems I replaced the MAF and didn’t change the readings. Still 8-9g/s. Upstream Oxygen sensors are fluctuating between .1-.8v like normal. Downstream appears to be a Little Rock .6v. What can cause the MAF to read high? It’s a 4.3L. The MAF should be reading close to that

    • @MyAutoproblems
      @MyAutoproblems  4 місяці тому

      @@SubePelayo928 check the Fuel Pressure.

    • @DevJB
      @DevJB 12 днів тому

      @@SubePelayo928 IAT or dual IAT Barometric Sensor in the intake plenum somewhere? Is barometric pressure locked at a low default like 16.095 etc?
      Or fuel pressure regulator is letting too much pressure through and pulse width cannot adjust ? Or air intake restriction before the maf such as air filter dirty or IAT and MAF itself is dirty, oily, contaminated by other cleaner than maf cleaner? Ever solve this?

    • @SubePelayo928
      @SubePelayo928 12 днів тому

      Figured out the problem, it had a leaking regulator and a bad EVAP solenoid on the intake

  • @simonflores3410
    @simonflores3410 2 місяці тому +1

    I drive a 2015 GMC Sierra 1500 5.3 4 wheel drive,my ? Is that my ltft bank 1 is -15 an my stft bank 1 is 3).an ltft bank 2 is -19 an my stft bank 2 is 2 so my question is this a Rich condition or a Lean condition I like your videos keep them rolling thank you please respond

    • @MyAutoproblems
      @MyAutoproblems  2 місяці тому

      Ideal values of ltft should be between +10 to -10. If the values is in Plus, its a lean condition. If the value is -negative, then its a Rich condition.
      If your vehicle comes with HIGH pressure Fuel Pump, then it might be bad. Check the Engine oil level, its viscosity and smell for Gasoline mixing because of a failed Pump.

    • @simonflores3410
      @simonflores3410 2 місяці тому

      Yes but which one do I look at the stft or the ltft which one is telling me that it has a lean condition so I look at stft

  • @johncundari1625
    @johncundari1625 4 місяці тому

    5.3 GMC
    Fuel consumption
    Hard shifts
    Rough running
    Rough idle
    Shudders under acceleration/loss of power/boggish
    Feels like misfiring but no misfires detected
    Sparked plugs (twice in a month) ac delco oem
    Spark plug Wires ac delco oem
    Coil packs MSD
    Replaced alternator
    Changed oil and filter multiple times
    Trans fluid at perfect levels, still red, smells ok
    Removed and cleaned MAF sensor
    Removed and cleaned throttle body
    Replaced all 8 fuel injectors (took it to a shop for that)
    New a/c compressor and pulley (failed causing overheating at idle) new one fixed that.
    Replaced Barro sensor or “MAP” sensor
    After all that the truck runs better, but is still having all the stated issues at TOP. I balanced the fuel Injectors and I am inexperienced but they seem just slightly off to me.
    I also have only once intermittently witnessed live data short term fuel trims at -100. Not sure what would or could have caused that. Looking for any advice this video was helpful thank you very much going to try this and check FP before bringing back to shop that put in the injectors. Thank you!

    • @johncundari1625
      @johncundari1625 4 місяці тому +1

      Only codes I have are BCM codes from broken headlight lens, license plate lamps, and tpsm out.
      ECM
      Invalid Data from BCM-invalid data- U0422-71
      2 other codes in history that aren’t current.

    • @MyAutoproblems
      @MyAutoproblems  4 місяці тому

      What are the history codes? And can you monitor the fuel trims at vehicle Idle and provide me with that.

    • @johncundari1625
      @johncundari1625 4 місяці тому +1

      @@MyAutoproblems the history codes were for an abs brake line that was damaged and fixed and for a BARO sensor that according to the scanner, looks like it was only thrown once in the past at some point. I changed it with a new one to be sure, and when I saw it though for sure that was my issue. But no luck after replacing it. I will get live data fuel trims tomorrow. Thank you so much for the insight.

    • @johncundari1625
      @johncundari1625 4 місяці тому

      Short term fuel trim bank 1 bounces between 0 and 2
      Long term fuel trim bank 1 stays at -6
      Short term fuel trim bank 2 bounces between -1 and -2
      Long term fuel trim bank 2 stays at -7

  • @juancastillo-si5jj
    @juancastillo-si5jj 18 днів тому

    🤠👍