DTC P0300

Discussion in 'General Discussion' started by LandRanger, Feb 12, 2018.

  1. LandRanger

    LandRanger TYF Newbie

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    This my first post I have owned several Chevy and GMC trucks the last 30 years, I currently drive a 2007 Z71 Tahoe with 180K miles.

    My 2007 Tahoe 5.3 LMG briefly flashed the CEI and Traction Control lights on Wednesday afternoon and went off, didn't notice any performance issue while going 75 to 80 mph, the next morning it did it again at highway speeds and stayed on a bit longer but went away, that afternoon it came on and stayed on. I've checked for intake & vacuum leaks, fuel pressure and trim, compression, injector plugs are pulsing, and have spark. My scanner tells me that #4 cylinder is misfiring 490 count, #3 45 count and #2 28 count. I just changed the injectors about 14 months ago. Regardless I have compression and spark so logic would assume the fuel is missing, I'm replacing the #4 injector today. Am I missing anything, if I have compression I shouldn't have a collapsed lifter. We'll see what happens with the new injector...

    If any of you have a suggestion please opine.
     
  2. swathdiver

    swathdiver Full Access Member

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    Can your scan tool command each injector on and off? Welcome to the forum btw Jeff.
     
  3. LandRanger

    LandRanger TYF Newbie

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    Thank you! No I don't have a scanner that advanced.
     
  4. Doubeleive

    Doubeleive Senior Member Supporting Member

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    could be other things, plugs. wires, coil packs, intake leak. none of which have anything to do with traction control.....that is a separate issue altogether such as abs module, abs sensors or steering sensor. needs a good scan with live data feed.
     
  5. CMil527

    CMil527 Full Access Member

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    Welcome Jeff!
     
  6. LandRanger

    LandRanger TYF Newbie

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    Thanks all, I'm taking to a reputable shop for diagnosis. I'll post the outcome.

    Thanks again!
     
    swathdiver likes this.

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